feat(frontend): feed of deleted and edited messages above the chat list and per chat in the changes panel

frontend/src/lib/api/endpoints.ts

@@ -9,6 +9,11 @@ import type {
   ChatLinkView,
   DayCount,
   DiscoverItem,
+  FeedChatKind,
+  FeedKind,
+  FeedMessagesPage,
+  FeedPage,
+  FeedUnseen,
   Folder,
   JobStatus,
   JobView,
@@ -274,6 +279,39 @@ export function listDeleted(
   });
 }
 
+export interface FeedQuery {
+  chat_id?: number;
+  chat_kind?: FeedChatKind;
+  cursor?: string;
+  kind?: FeedKind;
+  limit?: number;
+}
+
+export function listFeed(query: FeedQuery = {}): Promise<FeedPage> {
+  return request<FeedPage>("/feed", { account: true, query: { ...query } });
+}
+
+export function getFeedUnseen(): Promise<FeedUnseen> {
+  return request<FeedUnseen>("/feed/unseen", { account: true });
+}
+
+export function markFeedSeen(at?: string): Promise<FeedUnseen> {
+  return request<FeedUnseen>("/feed/seen", {
+    body: { account_id: accounts.selectedId, at },
+    method: "POST",
+  });
+}
+
+export function listFeedMessages(
+  itemId: number,
+  query: { cursor?: string; limit?: number } = {}
+): Promise<FeedMessagesPage> {
+  return request<FeedMessagesPage>(`/feed/${itemId}/messages`, {
+    account: true,
+    query: { ...query },
+  });
+}
+
 export function getPeer(peerId: number): Promise<PeerView> {
   return request<PeerView>(`/peers/${peerId}`, { account: true });
 }

frontend/src/lib/api/types.ts

@@ -222,6 +222,52 @@ export interface MessageVersion {
   text: string | null;
 }
 
+export type FeedKind = "all" | "deleted" | "edited";
+export type FeedChatKind = "dm" | "group" | "channel";
+
+export interface FeedChat {
+  chat_id: number;
+  has_avatar: boolean;
+  kind: FeedChatKind;
+  title: string | null;
+}
+
+export interface FeedItem {
+  after: string | null;
+  at: string;
+  before: string | null;
+  chat: FeedChat;
+  edit_date: string | null;
+  has_before: boolean;
+  id: number;
+  kind: Exclude<FeedKind, "all">;
+  message: MessageView | null;
+  message_count: number;
+  message_id: number;
+  outgoing: boolean;
+  sender_id: number | null;
+  sender_name: string | null;
+  since: string;
+}
+
+export interface FeedPage {
+  items: FeedItem[];
+  next_cursor: string | null;
+}
+
+export interface FeedUnseen {
+  count: number;
+  deleted: number;
+  edited: number;
+  latest: FeedItem | null;
+  seen_at: string | null;
+}
+
+export interface FeedMessagesPage {
+  messages: MessageView[];
+  next_cursor: string | null;
+}
+
 export interface MediaVersion {
   file_size: number | null;
   id: number;

frontend/src/lib/components/ChatHeader.svelte

@@ -8,14 +8,17 @@
   import Icon from "#lib/components/ui/Icon.svelte";
   import { peerName } from "#lib/format/peer.js";
   import { formatPresence, isOnline } from "#lib/format/presence.js";
+  import { t } from "#lib/i18n/locale.svelte.js";
   import { accounts } from "#lib/stores/accounts.svelte.js";
   import { chats } from "#lib/stores/chats.svelte.js";
   import { discover } from "#lib/stores/discover.svelte.js";
+  import { withoutMessage } from "#lib/stores/feed.svelte.js";
   import { policyUi } from "#lib/stores/policy.svelte.js";
   import { presence } from "#lib/stores/presence.svelte.js";
   import { toasts } from "#lib/stores/toasts.svelte.js";
   import { ui } from "#lib/stores/ui.svelte.js";
   import { goto } from "$app/navigation";
+  import { page } from "$app/state";
 
   interface Props {
     chatId: number;
@@ -36,14 +39,20 @@
     backfilling = true;
     try {
       await enqueueBackfill(chatId, true);
-      toasts.success("Догружаем новые сообщения");
+      toasts.success(t("chat.backfill.started"));
     } catch {
-      toasts.error("Не удалось запустить бэкфилл");
+      toasts.error(t("chat.backfill.failed"));
     } finally {
       backfilling = false;
     }
   }
 
+  function back() {
+    const target = new URL(page.url.href);
+    target.pathname = "/app";
+    goto(withoutMessage(target));
+  }
+
   $effect(() => {
     if (accounts.selectedId === null) {
       return;
@@ -82,7 +91,9 @@
   const fallbackTitle = $derived(
     chat?.title ??
       discovered?.title ??
-      (isDm ? "Удалённый аккаунт" : `Chat ${chatId}`)
+      (isDm
+        ? t("chat.deletedAccount")
+        : t("chat.fallbackTitle", { id: chatId }))
   );
   const title = $derived(isDm && peer ? peerName(peer) : fallbackTitle);
   const subtitle = $derived.by(() => {
@@ -97,9 +108,11 @@
     }
     const count = chat?.message_count ?? discovered?.message_count ?? 0;
     if (count > 0) {
-      return `${count} messages`;
+      return t("chat.messages", { count });
     }
-    return discovered?.kind === "channel" ? "channel" : "group";
+    return discovered?.kind === "channel"
+      ? t("chat.kind.channel")
+      : t("chat.kind.group");
   });
   const avatarKind = $derived(isDm ? "peer" : "chat");
   const hasAvatar = $derived(
@@ -114,8 +127,8 @@
 <header class="chat-header">
   <div class="back">
     <Button
-      aria-label="Назад"
+      aria-label={t("common.back")}
-      onclick={() => goto("/app")}
+      onclick={back}
       round
       smaller
       variant="translucent"
@@ -129,7 +142,7 @@
     })}
       <button
         {...props}
-        aria-label="Открыть профиль"
+        aria-label={t("chat.openProfile")}
         class="peek"
         onclick={() => ui.openPanel("profile")}
         type="button"
@@ -157,23 +170,26 @@
     {/snippet}
     {#snippet menu()}
       <ContextMenuItem icon="info" onselect={() => ui.openPanel("profile")}
-        >Открыть профиль</ContextMenuItem
+        >{t("chat.openProfile")}</ContextMenuItem
+      >
+      <ContextMenuItem icon="recent" onselect={() => ui.openPanel("changes")}
+        >{t("feed.changes")}</ContextMenuItem
       >
       <ContextMenuItem
         icon="play-story"
         onselect={() => ui.openPanel("stories")}
-        >Сторис</ContextMenuItem
+        >{t("settings.stories")}</ContextMenuItem
       >
       <ContextMenuItem
         icon="settings"
         onselect={() => policyUi.edit({ chatId }, title)}
-        >Политика захвата</ContextMenuItem
+        >{t("settings.policy")}</ContextMenuItem
       >
     {/snippet}
   </ContextMenu>
   <div class="actions">
     <Button
-      aria-label="Поиск в чате"
+      aria-label={t("chat.search")}
       onclick={() => ui.openPanel("search")}
       round
       smaller
@@ -182,7 +198,16 @@
       <Icon name="search" />
     </Button>
     <Button
-      aria-label="Аналитика"
+      aria-label={t("feed.changes")}
+      onclick={() => ui.openPanel("changes")}
+      round
+      smaller
+      variant="translucent"
+    >
+      <Icon name="recent" />
+    </Button>
+    <Button
+      aria-label={t("chat.analytics")}
       onclick={() => ui.openPanel("presence")}
       round
       smaller
@@ -191,7 +216,7 @@
       <Icon name="stats" />
     </Button>
     <Button
-      aria-label="Догрузить новые сообщения"
+      aria-label={t("chat.backfill")}
       loading={backfilling}
       onclick={backfill}
       round

frontend/src/lib/components/ChatList.svelte

@@ -1,8 +1,10 @@
 <script lang="ts">
   import { untrack } from "svelte";
   import ChatListItem from "#lib/components/ChatListItem.svelte";
+  import FeedRow from "#lib/components/feed/FeedRow.svelte";
   import EmptyState from "#lib/components/ui/EmptyState.svelte";
   import Skeleton from "#lib/components/ui/Skeleton.svelte";
+  import { t } from "#lib/i18n/locale.svelte.js";
   import { accounts } from "#lib/stores/accounts.svelte.js";
   import { chats } from "#lib/stores/chats.svelte.js";
   import { folders } from "#lib/stores/folders.svelte.js";
@@ -46,7 +48,7 @@
       return;
     }
     untrack(() => folders.load()).catch(() =>
-      toasts.error("Failed to load folders")
+      toasts.error(t("chats.foldersFailed"))
     );
   });
 
@@ -60,7 +62,7 @@
       scrollTop = 0;
     }
     untrack(() => chats.load(folderId)).catch(() =>
-      toasts.error("Failed to load chats")
+      toasts.error(t("chats.loadFailed"))
     );
   });
 
@@ -99,6 +101,9 @@
   bind:this={viewport}
   bind:clientHeight={viewportHeight}
 >
+  {#if folders.selectedId === null}
+    <FeedRow />
+  {/if}
   {#if chats.loading && list.length === 0}
     {#each skeletonRows as index (index)}
       <div class="row-skeleton">
@@ -113,8 +118,10 @@
     <EmptyState
       description={folders.selectedId === null
         ? undefined
-        : "No chats match this folder yet"}
+        : t("chats.emptyFolderHint")}
-      title={folders.selectedId === null ? "No chats yet" : "Empty folder"}
+      title={folders.selectedId === null
+        ? t("chats.empty")
+        : t("chats.emptyFolder")}
     />
   {:else}
     <div style:padding-bottom="{padBottom}px" style:padding-top="{padTop}px">

frontend/src/lib/components/ChatListItem.svelte

@@ -5,6 +5,7 @@
   import ContextMenu from "#lib/components/ui/ContextMenu.svelte";
   import ContextMenuItem from "#lib/components/ui/ContextMenuItem.svelte";
   import { formatListDate } from "#lib/format/datetime.js";
+  import { t } from "#lib/i18n/locale.svelte.js";
   import { accounts } from "#lib/stores/accounts.svelte.js";
   import { peers } from "#lib/stores/peers.svelte.js";
   import { policyUi } from "#lib/stores/policy.svelte.js";
@@ -26,7 +27,9 @@
 
   const title = $derived(
     chat.title ??
-      (chat.chat_id > 0 ? "Удалённый аккаунт" : `Chat ${chat.chat_id}`)
+      (chat.chat_id > 0
+        ? t("chat.deletedAccount")
+        : t("chat.fallbackTitle", { id: chat.chat_id }))
   );
   const avatarKind = $derived(chat.chat_id > 0 ? "peer" : "chat");
   const ownId = $derived(accounts.selected?.tg_user_id ?? null);
@@ -45,7 +48,7 @@
       return "";
     }
     if (chat.last_sender_id === ownId) {
-      return "You: ";
+      return `${t("chat.you")}: `;
     }
     const peer = peers.get(chat.last_sender_id as number);
     if (!peer) {
@@ -55,7 +58,7 @@
   });
 
   const preview = $derived(
-    chat.last_text ?? (chat.message_count > 0 ? "Media" : "")
+    chat.last_text ?? (chat.message_count > 0 ? t("chat.media") : "")
   );
 </script>
 
@@ -95,24 +98,27 @@
   {/snippet}
   {#snippet menu()}
     <ContextMenuItem icon="open-in-new-tab" onselect={onclick}
-      >Открыть</ContextMenuItem
+      >{t("chat.open")}</ContextMenuItem
     >
     <ContextMenuItem icon="info" onselect={() => openWith("profile")}
-      >Профиль</ContextMenuItem
+      >{t("chat.profile")}</ContextMenuItem
     >
     <ContextMenuItem icon="search" onselect={() => openWith("search")}
-      >Поиск в чате</ContextMenuItem
+      >{t("chat.search")}</ContextMenuItem
+    >
+    <ContextMenuItem icon="recent" onselect={() => openWith("changes")}
+      >{t("feed.changes")}</ContextMenuItem
     >
     <ContextMenuItem icon="stats" onselect={() => openWith("presence")}
-      >Аналитика</ContextMenuItem
+      >{t("chat.analytics")}</ContextMenuItem
     >
     <ContextMenuItem icon="play-story" onselect={() => openWith("stories")}
-      >Сторис</ContextMenuItem
+      >{t("settings.stories")}</ContextMenuItem
     >
     <ContextMenuItem
       icon="settings"
       onselect={() => policyUi.edit({ chatId: chat.chat_id }, title)}
-      >Политика захвата</ContextMenuItem
+      >{t("settings.policy")}</ContextMenuItem
     >
   {/snippet}
 </ContextMenu>

frontend/src/lib/components/RightColumn.svelte

@@ -4,6 +4,7 @@
   import BotsPanel from "#lib/components/bots/BotsPanel.svelte";
   import StoragePanel from "#lib/components/disk/StoragePanel.svelte";
   import TrashPanel from "#lib/components/disk/TrashPanel.svelte";
+  import ChatChanges from "#lib/components/feed/ChatChanges.svelte";
   import JobsPanel from "#lib/components/jobs/JobsPanel.svelte";
   import PolicyEditor from "#lib/components/policy/PolicyEditor.svelte";
   import AnalyticsPanel from "#lib/components/presence/AnalyticsPanel.svelte";
@@ -21,35 +22,37 @@
   import WatchesPanel from "#lib/components/watches/WatchesPanel.svelte";
   import WebhooksPanel from "#lib/components/watches/WebhooksPanel.svelte";
   import { t } from "#lib/i18n/locale.svelte.js";
+  import type { MessageKey } from "#lib/i18n/messages.js";
   import { accounts } from "#lib/stores/accounts.svelte.js";
   import { chats } from "#lib/stores/chats.svelte.js";
   import { policyUi } from "#lib/stores/policy.svelte.js";
   import { storageUi } from "#lib/stores/storage.svelte.js";
   import { type RightPanel, ui } from "#lib/stores/ui.svelte.js";
 
-  const titles: Record<RightPanel, string> = $derived({
+  const titles: Record<RightPanel, MessageKey> = {
-    alerts: t("settings.alerts"),
+    alerts: "settings.alerts",
-    annotations: "Заметки",
+    annotations: "panel.annotations",
-    bots: "Боты",
+    bots: "settings.bots",
-    callbacks: "Callback-данные",
+    callbacks: "panel.callbacks",
-    jobs: "Бэкфилл и задачи",
+    changes: "feed.changes",
-    links: "Ссылки",
+    jobs: "settings.jobs",
-    policy: "Политика захвата",
+    links: "panel.links",
-    presence: "Аналитика",
+    policy: "settings.policy",
-    profile: "Профиль",
+    presence: "chat.analytics",
-    reactions: "Реакции",
+    profile: "chat.profile",
-    readers: t("read.readers.title"),
+    reactions: "panel.reactions",
-    search: "Поиск",
+    readers: "read.readers.title",
-    shares: "Файлы по ссылке",
+    search: "panel.search",
-    storage: "Хранилище",
+    shares: "settings.shares",
-    "storage-chat": "Файлы чата",
+    storage: "settings.storage",
-    "storage-trash": "Корзина",
+    "storage-chat": "panel.chatFiles",
-    stories: "Сторис",
+    "storage-trash": "panel.trash",
-    "stories-all": "Все сторис",
+    stories: "settings.stories",
-    versions: "Версии",
+    "stories-all": "panel.allStories",
-    watches: t("settings.watches"),
+    versions: "panel.versions",
-    webhooks: t("watches.webhooks"),
+    watches: "settings.watches",
-  });
+    webhooks: "watches.webhooks",
+  };
 
   const parents: Partial<Record<RightPanel, RightPanel>> = {
     "storage-chat": "storage",
@@ -66,14 +69,14 @@
       ui.rightPanel === "storage-chat" && storageUi.chatId !== null
         ? chats.byId(storageUi.chatId)
         : undefined;
-    return chat?.title ?? titles[ui.rightPanel];
+    return chat?.title ?? t(titles[ui.rightPanel]);
   });
 </script>
 
 <header class="right-header">
   {#if parent}
     <Button
-      aria-label="Назад"
+      aria-label={t("common.back")}
       onclick={() => ui.openPanel(parent)}
       round
       smaller
@@ -83,7 +86,7 @@
     </Button>
   {:else}
     <Button
-      aria-label="Закрыть"
+      aria-label={t("common.close")}
       onclick={() => ui.closePanel()}
       round
       smaller
@@ -98,6 +101,10 @@
 <div class="right-body custom-scroll">
   {#if ui.rightPanel === "profile"}
     <ProfilePanel />
+  {:else if ui.rightPanel === "changes"}
+    {#key accounts.selectedId}
+      <ChatChanges />
+    {/key}
   {:else if ui.rightPanel === "policy"}
     {#key `${accounts.selectedId}:${policyUi.revision}`}
       <PolicyEditor />

frontend/src/lib/components/feed/ChatChanges.svelte

@@ -0,0 +1,35 @@
+<script lang="ts">
+  import type { FeedKind } from "#lib/api/types.js";
+  import FeedFilters from "#lib/components/feed/FeedFilters.svelte";
+  import FeedList from "#lib/components/feed/FeedList.svelte";
+  import { ui } from "#lib/stores/ui.svelte.js";
+  import { isMobile } from "#lib/viewport.js";
+  import { page } from "$app/state";
+
+  const chatId = $derived(
+    page.params.chatId ? Number(page.params.chatId) : null
+  );
+
+  let kind = $state<FeedKind>("all");
+
+  function pick(next: FeedKind) {
+    kind = next;
+  }
+
+  function open(messageId: number) {
+    if (chatId === null) {
+      return;
+    }
+    ui.requestJump(chatId, messageId);
+    if (isMobile()) {
+      ui.closePanel();
+    }
+  }
+</script>
+
+{#if chatId !== null}
+  <FeedFilters {kind} onkind={pick} />
+  {#key chatId}
+    <FeedList {chatId} {kind} onopen={(_, messageId) => open(messageId)} />
+  {/key}
+{/if}

frontend/src/lib/components/feed/FeedBulk.svelte

@@ -0,0 +1,151 @@
+<script lang="ts">
+  import { onMount } from "svelte";
+  import { ripple } from "#lib/actions/ripple.js";
+  import { listFeedMessages } from "#lib/api/endpoints.js";
+  import type { FeedItem, MessageView } from "#lib/api/types.js";
+  import FeedText from "#lib/components/feed/FeedText.svelte";
+  import Spinner from "#lib/components/ui/Spinner.svelte";
+  import { formatDayTime, formatFull } from "#lib/format/datetime.js";
+  import { t } from "#lib/i18n/locale.svelte.js";
+
+  interface Props {
+    item: FeedItem;
+    onopen: (messageId: number) => void;
+    senderOf: (message: MessageView) => string;
+  }
+
+  let { item, onopen, senderOf }: Props = $props();
+
+  const PAGE = 50;
+
+  let messages = $state<MessageView[]>([]);
+  let cursor = $state<string | null>(null);
+  let loading = $state(false);
+  let failed = $state(false);
+
+  async function load(next: string | null) {
+    loading = true;
+    failed = false;
+    try {
+      const page = await listFeedMessages(item.id, {
+        cursor: next ?? undefined,
+        limit: PAGE,
+      });
+      messages = [...messages, ...page.messages];
+      cursor = page.next_cursor;
+    } catch {
+      failed = true;
+    } finally {
+      loading = false;
+    }
+  }
+
+  onMount(() => {
+    load(null);
+  });
+</script>
+
+<div class="bulk">
+  {#each messages as message (message.message_id)}
+    <button
+      class="member"
+      onclick={() => onopen(message.message_id)}
+      type="button"
+      use:ripple
+    >
+      <FeedText deleted {message} prefix={senderOf(message)} />
+      <time
+        class="date"
+        datetime={message.date}
+        title={formatFull(message.date)}
+      >
+        {formatDayTime(message.date)}
+      </time>
+    </button>
+  {/each}
+  {#if loading}
+    <div class="state"><Spinner /></div>
+  {:else if failed}
+    <button class="more" onclick={() => load(cursor)} type="button">
+      {t("feed.retry")}
+    </button>
+  {:else if cursor !== null}
+    <button class="more" onclick={() => load(cursor)} type="button">
+      {t("feed.more")}
+    </button>
+  {/if}
+</div>
+
+<style lang="scss">
+  .bulk {
+    display: flex;
+    flex-direction: column;
+    gap: 0.125rem;
+
+    margin: 0 0 0.375rem 4.125rem;
+    padding-inline-start: 0.625rem;
+    border-inline-start: 2px solid var(--color-borders);
+  }
+
+  .member {
+    cursor: pointer;
+    position: relative;
+    overflow: hidden;
+    display: flex;
+    gap: 0.5rem;
+    align-items: baseline;
+
+    width: 100%;
+    padding: 0.375rem 0.5rem;
+    border: 0;
+    border-radius: var(--border-radius-default-small);
+
+    font: inherit;
+    text-align: start;
+    color: var(--color-text);
+
+    background: none;
+
+    --ripple-color: var(--color-interactive-element-hover);
+
+    :global(.feed-text) {
+      flex: 1;
+      min-width: 0;
+      font-size: 0.875rem;
+    }
+
+    @media (hover: hover) {
+      &:hover {
+        background-color: var(--color-chat-hover);
+      }
+    }
+  }
+
+  .date {
+    flex-shrink: 0;
+    font-size: 0.75rem;
+    font-variant-numeric: tabular-nums;
+    color: var(--color-text-secondary);
+  }
+
+  .state {
+    display: flex;
+    justify-content: center;
+    padding: 0.5rem 0;
+  }
+
+  .more {
+    cursor: pointer;
+
+    margin-top: 0.25rem;
+    padding: 0.5rem;
+    border: 0;
+    border-radius: 0.5rem;
+
+    font: inherit;
+    font-size: 0.875rem;
+    color: var(--color-primary);
+
+    background-color: var(--color-background-secondary);
+  }
+</style>

frontend/src/lib/components/feed/FeedEntry.svelte

@@ -0,0 +1,363 @@
+<script lang="ts">
+  import { ripple } from "#lib/actions/ripple.js";
+  import type { FeedItem, MessageView } from "#lib/api/types.js";
+  import FeedBulk from "#lib/components/feed/FeedBulk.svelte";
+  import FeedText from "#lib/components/feed/FeedText.svelte";
+  import Avatar from "#lib/components/ui/Avatar.svelte";
+  import Icon from "#lib/components/ui/Icon.svelte";
+  import { formatFull, formatListDate } from "#lib/format/datetime.js";
+  import { wordDiff } from "#lib/format/diff.js";
+  import { peerName } from "#lib/format/peer.js";
+  import { t } from "#lib/i18n/locale.svelte.js";
+  import { accounts } from "#lib/stores/accounts.svelte.js";
+  import { peers } from "#lib/stores/peers.svelte.js";
+
+  interface Props {
+    inChat?: boolean;
+    item: FeedItem;
+    onopen: (messageId: number) => void;
+  }
+
+  let { item, onopen, inChat = false }: Props = $props();
+
+  let expanded = $state(false);
+
+  const ownId = $derived(accounts.selected?.tg_user_id ?? null);
+  const bulk = $derived(item.kind === "deleted" && item.message_count > 1);
+  const isGroup = $derived(item.chat.kind === "group");
+
+  $effect(() => {
+    if (item.sender_id !== null && item.sender_id > 0) {
+      peers.ensure([item.sender_id]);
+    }
+  });
+
+  function senderName(senderId: number | null, fallback: string | null) {
+    if (senderId === null) {
+      return fallback ?? "";
+    }
+    if (senderId === ownId) {
+      return t("chat.you");
+    }
+    const peer = peers.get(senderId);
+    if (peer) {
+      return peerName(peer);
+    }
+    return fallback ?? String(senderId);
+  }
+
+  function shortName(senderId: number | null, fallback: string | null) {
+    if (senderId === ownId) {
+      return t("chat.you");
+    }
+    const peer = senderId === null ? undefined : peers.get(senderId);
+    return peer?.first_name || senderName(senderId, fallback);
+  }
+
+  function prefixOf(message: MessageView): string {
+    if (message.sender_id === ownId) {
+      return t("chat.you");
+    }
+    return isGroup ? shortName(message.sender_id, null) : "";
+  }
+
+  const chatTitle = $derived(
+    item.chat.title ??
+      (item.chat.chat_id > 0
+        ? t("chat.deletedAccount")
+        : t("chat.fallbackTitle", { id: item.chat.chat_id }))
+  );
+  const title = $derived.by(() => {
+    if (!inChat) {
+      return chatTitle;
+    }
+    if (bulk) {
+      return t("feed.bulk", { count: item.message_count });
+    }
+    return senderName(item.sender_id, item.sender_name);
+  });
+  const avatar = $derived.by(() => {
+    if (!inChat) {
+      return {
+        has: item.chat.has_avatar,
+        id: item.chat.chat_id,
+        kind: item.chat.chat_id > 0 ? ("peer" as const) : ("chat" as const),
+      };
+    }
+    const id = item.sender_id ?? item.chat.chat_id;
+    return {
+      has: id > 0 ? (peers.get(id)?.has_avatar ?? false) : item.chat.has_avatar,
+      id,
+      kind: id > 0 ? ("peer" as const) : ("chat" as const),
+    };
+  });
+  const prefix = $derived.by(() => {
+    if (inChat) {
+      return "";
+    }
+    if (item.outgoing) {
+      return t("chat.you");
+    }
+    return isGroup ? shortName(item.sender_id, item.sender_name) : "";
+  });
+  const sameText = $derived(item.has_before && item.before === item.after);
+  const diff = $derived(
+    item.kind === "edited" && item.has_before && !sameText
+      ? wordDiff(item.before ?? "", item.after ?? "")
+      : null
+  );
+
+  function open() {
+    if (bulk) {
+      expanded = !expanded;
+      return;
+    }
+    onopen(item.message_id);
+  }
+</script>
+
+<div class="feed-entry">
+  <button
+    aria-expanded={bulk ? expanded : undefined}
+    class="row"
+    onclick={open}
+    type="button"
+    use:ripple
+  >
+    {#if inChat && bulk}
+      <span class="glyph"><Icon name="delete" size="1.5rem" /></span>
+    {:else}
+      <Avatar
+        avatar={{ id: avatar.id, kind: avatar.kind }}
+        colorKey={avatar.id}
+        hasAvatar={avatar.has}
+        name={title}
+        size={3}
+      />
+    {/if}
+    <span class="body">
+      <span class="top">
+        <span class="title">{title}</span>
+        <time datetime={item.at} title={formatFull(item.at)}>
+          {formatListDate(item.at)}
+        </time>
+      </span>
+      {#if bulk}
+        <span class="mark">
+          <Icon name="delete" size="0.875rem" />
+          {inChat
+            ? t("feed.deleted")
+            : t("feed.bulk", { count: item.message_count })}
+          <span class="chevron" class:open={expanded}>
+            <Icon name="down" size="1rem" />
+          </span>
+        </span>
+        {#if !expanded}
+          <FeedText deleted message={item.message} {prefix} />
+        {/if}
+      {:else if item.kind === "deleted"}
+        <FeedText
+          deleted
+          mark={t("feed.deleted")}
+          message={item.message}
+          {prefix}
+        />
+      {:else if sameText}
+        <span class="mark edited">
+          <Icon name="edit" size="0.875rem" />
+          {t("feed.mediaChanged")}
+        </span>
+        <FeedText message={item.message} {prefix} />
+      {:else}
+        <span class="change">
+          <span class="tag">{t("feed.before")}</span>
+          {#if !item.has_before}
+            <span class="missing">{t("feed.lostText")}</span>
+          {:else if !item.before}
+            <span class="missing">{t("feed.noText")}</span>
+          {:else if diff}
+            {#each diff.before as part, index (index)}
+              <span class:removed={part.changed}>{part.text}</span>
+            {/each}
+          {:else}
+            {item.before}
+          {/if}
+        </span>
+        <span class="change now">
+          <span class="tag">{t("feed.after")}</span>
+          {#if prefix}
+            <span class="prefix">{prefix}:</span>
+          {/if}
+          {#if !item.after}
+            <span class="missing">{t("feed.noText")}</span>
+          {:else if diff}
+            {#each diff.after as part, index (index)}
+              <span class:added={part.changed}>{part.text}</span>
+            {/each}
+          {:else}
+            {item.after}
+          {/if}
+        </span>
+      {/if}
+    </span>
+  </button>
+  {#if bulk && expanded}
+    {#key `${item.id}:${item.message_count}`}
+      <FeedBulk {item} {onopen} senderOf={prefixOf} />
+    {/key}
+  {/if}
+</div>
+
+<style lang="scss">
+  .row {
+    cursor: pointer;
+    position: relative;
+    overflow: hidden;
+    display: flex;
+    gap: 0.625rem;
+    align-items: flex-start;
+
+    width: 100%;
+    padding: 0.5625rem 0.5rem;
+    border: 0;
+    border-radius: var(--border-radius-default-small);
+
+    font: inherit;
+    text-align: start;
+    color: var(--color-text);
+
+    background-color: transparent;
+    transition: background-color 0.15s ease;
+
+    --ripple-color: var(--color-interactive-element-hover);
+
+    @media (hover: hover) {
+      &:hover {
+        background-color: var(--color-chat-hover);
+      }
+    }
+
+    &:focus-visible {
+      outline: 2px solid var(--color-primary);
+      outline-offset: -2px;
+    }
+  }
+
+  .glyph {
+    display: flex;
+    flex-shrink: 0;
+    align-items: center;
+    justify-content: center;
+
+    width: 3rem;
+    height: 3rem;
+    border-radius: 50%;
+
+    color: var(--color-white);
+
+    background-color: var(--color-gray);
+  }
+
+  .body {
+    display: flex;
+    overflow: hidden;
+    flex: 1;
+    flex-direction: column;
+    gap: 0.125rem;
+
+    min-width: 0;
+  }
+
+  .top {
+    display: flex;
+    gap: 0.5rem;
+    align-items: baseline;
+  }
+
+  .title {
+    overflow: hidden;
+    flex: 1;
+
+    font-size: 1rem;
+    font-weight: var(--font-weight-medium);
+    text-overflow: ellipsis;
+    white-space: nowrap;
+  }
+
+  time {
+    flex-shrink: 0;
+    font-size: 0.75rem;
+    font-variant-numeric: tabular-nums;
+    color: var(--color-text-secondary);
+  }
+
+  .mark {
+    display: inline-flex;
+    gap: 0.25rem;
+    align-items: center;
+
+    font-size: 0.8125rem;
+    font-weight: var(--font-weight-medium);
+    color: var(--color-error);
+
+    &.edited {
+      color: var(--color-text-secondary);
+    }
+  }
+
+  .chevron {
+    display: inline-flex;
+    color: var(--color-text-secondary);
+    transition: transform 0.2s ease;
+
+    &.open {
+      transform: rotate(180deg);
+    }
+  }
+
+  .change {
+    overflow: hidden;
+    display: -webkit-box;
+
+    font-size: 0.9375rem;
+    line-height: 1.25rem;
+    color: var(--color-text-secondary);
+    overflow-wrap: anywhere;
+
+    -webkit-line-clamp: 3;
+    line-clamp: 3;
+    -webkit-box-orient: vertical;
+
+    &.now {
+      color: var(--color-text);
+    }
+  }
+
+  .tag {
+    margin-inline-end: 0.375rem;
+
+    font-size: 0.8125rem;
+    font-weight: var(--font-weight-medium);
+    color: var(--color-text-secondary);
+  }
+
+  .prefix {
+    margin-inline-end: 0.25rem;
+    color: var(--color-text-secondary);
+  }
+
+  .removed {
+    text-decoration: line-through;
+    text-decoration-color: var(--color-error);
+  }
+
+  .added {
+    border-radius: 0.25rem;
+    background-color: color-mix(in srgb, var(--color-primary) 22%, transparent);
+    box-decoration-break: clone;
+  }
+
+  .missing {
+    font-style: italic;
+  }
+</style>

frontend/src/lib/components/feed/FeedFilters.svelte

@@ -0,0 +1,124 @@
+<script lang="ts">
+  import type { FeedChatKind, FeedKind } from "#lib/api/types.js";
+  import { t } from "#lib/i18n/locale.svelte.js";
+  import { FEED_CHAT_KINDS, FEED_KINDS } from "#lib/stores/feed.svelte.js";
+
+  interface Props {
+    chats?: FeedChatKind | null;
+    kind: FeedKind;
+    onchats?: (chats: FeedChatKind | null) => void;
+    onkind: (kind: FeedKind) => void;
+  }
+
+  let { kind, chats = null, onkind, onchats }: Props = $props();
+
+  const KIND_KEYS = {
+    all: "feed.filter.all",
+    deleted: "feed.filter.deleted",
+    edited: "feed.filter.edited",
+  } as const;
+
+  const CHAT_KEYS = {
+    channel: "feed.chats.channel",
+    dm: "feed.chats.dm",
+    group: "feed.chats.group",
+  } as const;
+</script>
+
+<div class="filters">
+  <div class="group">
+    {#each FEED_KINDS as option (option)}
+      <button
+        aria-pressed={kind === option}
+        class="chip"
+        onclick={() => onkind(option)}
+        type="button"
+        class:on={kind === option}
+      >
+        {t(KIND_KEYS[option])}
+      </button>
+    {/each}
+  </div>
+  {#if onchats}
+    <div class="group">
+      {#each FEED_CHAT_KINDS as option (option)}
+        <button
+          aria-pressed={chats === option}
+          class="chip"
+          onclick={() => onchats(chats === option ? null : option)}
+          type="button"
+          class:on={chats === option}
+        >
+          {t(CHAT_KEYS[option])}
+        </button>
+      {/each}
+    </div>
+  {/if}
+</div>
+
+<style lang="scss">
+  .filters {
+    display: flex;
+    flex-shrink: 0;
+    flex-wrap: wrap;
+    gap: 0.375rem 0.75rem;
+
+    padding: 0.625rem 1rem;
+    border-bottom: 1px solid var(--color-borders);
+  }
+
+  .group {
+    display: inline-flex;
+    flex-wrap: nowrap;
+    gap: 0.25rem;
+  }
+
+  .chip {
+    cursor: pointer;
+
+    display: inline-flex;
+    align-items: center;
+
+    height: 1.75rem;
+    padding: 0 0.625rem;
+    border: 0;
+    border-radius: 0.875rem;
+
+    font: inherit;
+    font-size: 0.8125rem;
+    color: var(--color-text);
+    white-space: nowrap;
+
+    background-color: var(--color-chat-hover);
+
+    transition:
+      background-color 0.15s ease-out,
+      box-shadow 0.15s ease-out;
+
+    &.on {
+      background-color: color-mix(
+        in srgb,
+        var(--color-primary) 12%,
+        transparent
+      );
+      box-shadow: inset 0 0 0 1px var(--color-primary);
+    }
+
+    @media (pointer: coarse) {
+      height: 2.25rem;
+      padding: 0 0.75rem;
+      border-radius: 1.125rem;
+    }
+
+    &:focus-visible {
+      outline: 2px solid var(--color-primary);
+      outline-offset: 1px;
+    }
+
+    @media (hover: hover) {
+      &:not(.on):hover {
+        background-color: var(--color-background-secondary-accent);
+      }
+    }
+  }
+</style>

frontend/src/lib/components/feed/FeedList.svelte

@@ -0,0 +1,191 @@
+<script lang="ts">
+  import { untrack } from "svelte";
+  import { visible } from "#lib/actions/visible.js";
+  import { type FeedQuery, listFeed } from "#lib/api/endpoints.js";
+  import type { FeedChatKind, FeedItem, FeedKind } from "#lib/api/types.js";
+  import FeedEntry from "#lib/components/feed/FeedEntry.svelte";
+  import Button from "#lib/components/ui/Button.svelte";
+  import EmptyState from "#lib/components/ui/EmptyState.svelte";
+  import Spinner from "#lib/components/ui/Spinner.svelte";
+  import { t } from "#lib/i18n/locale.svelte.js";
+  import { accounts } from "#lib/stores/accounts.svelte.js";
+  import { feed } from "#lib/stores/feed.svelte.js";
+
+  interface Props {
+    chatId?: number;
+    chats?: FeedChatKind | null;
+    kind: FeedKind;
+    onopen: (item: FeedItem, messageId: number) => void;
+  }
+
+  let { kind, chats = null, chatId, onopen }: Props = $props();
+
+  const PAGE = 30;
+  const EMPTY_KEYS = {
+    all: "feed.empty.all",
+    deleted: "feed.empty.deleted",
+    edited: "feed.empty.edited",
+  } as const;
+
+  let items = $state<FeedItem[]>([]);
+  let cursor = $state<string | null>(null);
+  let loading = $state(true);
+  let failed = $state(false);
+  let token = 0;
+  let { revision } = feed;
+
+  const filter = $derived<FeedQuery>({
+    chat_id: chatId,
+    chat_kind: chats ?? undefined,
+    kind,
+    limit: PAGE,
+  });
+  let active: FeedQuery = {};
+
+  function byTime(a: FeedItem, b: FeedItem): number {
+    return Date.parse(b.at) - Date.parse(a.at) || b.id - a.id;
+  }
+
+  async function reload() {
+    token += 1;
+    const mine = token;
+    loading = true;
+    failed = false;
+    try {
+      const page = await listFeed(active);
+      if (mine === token) {
+        ({ items } = page);
+        cursor = page.next_cursor;
+      }
+    } catch {
+      if (mine === token) {
+        failed = true;
+      }
+    } finally {
+      if (mine === token) {
+        loading = false;
+      }
+    }
+  }
+
+  async function more() {
+    if (loading || cursor === null) {
+      return;
+    }
+    const mine = token;
+    loading = true;
+    failed = false;
+    try {
+      const page = await listFeed({ ...active, cursor });
+      if (mine === token) {
+        const known = new Set(items.map((item) => item.id));
+        items = [...items, ...page.items.filter((item) => !known.has(item.id))];
+        cursor = page.next_cursor;
+      }
+    } catch {
+      if (mine === token) {
+        failed = true;
+      }
+    } finally {
+      if (mine === token) {
+        loading = false;
+      }
+    }
+  }
+
+  async function refreshHead() {
+    const mine = token;
+    const page = await listFeed(active);
+    if (mine !== token) {
+      return;
+    }
+    const fresh = new Set(page.items.map((item) => item.id));
+    const rest = items.filter((item) => !fresh.has(item.id));
+    items = [...page.items, ...rest].sort(byTime);
+    if (items.length === page.items.length) {
+      cursor = page.next_cursor;
+    }
+  }
+
+  $effect(() => {
+    const next = filter;
+    if (accounts.selectedId === null) {
+      return;
+    }
+    active = next;
+    untrack(() => reload());
+  });
+
+  $effect(() => {
+    const next = feed.revision;
+    if (next === revision) {
+      return;
+    }
+    revision = next;
+    untrack(() => refreshHead()).catch(() => undefined);
+  });
+</script>
+
+<div class="feed-list">
+  {#if items.length === 0 && loading}
+    <div class="state"><Spinner /></div>
+  {:else if items.length === 0 && failed}
+    <div class="state">
+      <p>{t("feed.error")}</p>
+      <Button onclick={reload} variant="text">{t("feed.retry")}</Button>
+    </div>
+  {:else if items.length === 0}
+    <EmptyState title={t(EMPTY_KEYS[kind])} />
+  {:else}
+    {#each items as item (item.id)}
+      <FeedEntry
+        inChat={chatId !== undefined}
+        {item}
+        onopen={(messageId) => onopen(item, messageId)}
+      />
+    {/each}
+    {#if cursor !== null}
+      {#if failed}
+        <div class="state">
+          <Button onclick={more} variant="text">{t("feed.retry")}</Button>
+        </div>
+      {:else}
+        {#key cursor}
+          <div class="state" use:visible={more}>
+            {#if loading}
+              <Spinner />
+            {/if}
+          </div>
+        {/key}
+      {/if}
+    {/if}
+  {/if}
+</div>
+
+<style lang="scss">
+  .feed-list {
+    display: flex;
+    flex-direction: column;
+    min-height: 100%;
+    padding: 0.25rem 0.4375rem 0.5rem;
+  }
+
+  .state {
+    display: flex;
+    flex-direction: column;
+    gap: 0.5rem;
+    align-items: center;
+    justify-content: center;
+
+    min-height: 3rem;
+    padding: 1rem;
+
+    color: var(--color-text-secondary);
+    text-align: center;
+
+    p {
+      margin: 0;
+      font-size: 0.875rem;
+    }
+  }
+</style>

frontend/src/lib/components/feed/FeedRow.svelte

@@ -0,0 +1,216 @@
+<script lang="ts">
+  import { ripple } from "#lib/actions/ripple.js";
+  import type { FeedItem } from "#lib/api/types.js";
+  import Icon from "#lib/components/ui/Icon.svelte";
+  import { formatListDate } from "#lib/format/datetime.js";
+  import { mediaKindLabel } from "#lib/format/media.js";
+  import { locale, t } from "#lib/i18n/locale.svelte.js";
+  import { accounts } from "#lib/stores/accounts.svelte.js";
+  import { feed } from "#lib/stores/feed.svelte.js";
+  import { page } from "$app/state";
+
+  const BADGE_LIMIT = 10_000;
+
+  const latest = $derived(feed.unseen?.latest ?? null);
+  const count = $derived(feed.unseen?.count ?? 0);
+  const badge = $derived(
+    count < BADGE_LIMIT
+      ? String(count)
+      : new Intl.NumberFormat(locale.tag, { notation: "compact" }).format(count)
+  );
+
+  $effect(() => {
+    if (accounts.selectedId !== null) {
+      feed.sync();
+    }
+  });
+
+  function chatTitle(item: FeedItem): string {
+    return (
+      item.chat.title ??
+      (item.chat.chat_id > 0
+        ? t("chat.deletedAccount")
+        : t("chat.fallbackTitle", { id: item.chat.chat_id }))
+    );
+  }
+
+  function summary(item: FeedItem): string {
+    if (item.kind === "deleted" && item.message_count > 1) {
+      return t("feed.bulk", { count: item.message_count });
+    }
+    const text = item.kind === "edited" ? item.after : item.message?.text;
+    const media = item.message?.media[0]?.kind ?? null;
+    return text?.trim() || mediaKindLabel(media) || t("feed.noText");
+  }
+</script>
+
+<button
+  class="feed-row"
+  onclick={() => feed.open(page.url)}
+  type="button"
+  use:ripple
+>
+  <span class="avatar"><Icon name="recent" /></span>
+  <span class="info">
+    <span class="info-row">
+      <span class="title">{t("feed.title")}</span>
+      {#if latest}
+        <span class="date">{formatListDate(latest.at)}</span>
+      {/if}
+    </span>
+    <span class="subtitle">
+      <span class="preview">
+        {#if latest}
+          <Icon
+            class="kind"
+            name={latest.kind === "deleted" ? "delete" : "edit"}
+            size="0.875rem"
+          />
+          <span class="chat">{chatTitle(latest)}:</span>
+          <span
+            class:struck={latest.kind === "deleted" &&
+              latest.message_count === 1}
+            >{summary(latest)}</span
+          >
+        {:else}
+          {t("feed.empty.all")}
+        {/if}
+      </span>
+      {#if count > 0}
+        <span class="badge">{badge}</span>
+      {/if}
+    </span>
+  </span>
+</button>
+
+<style lang="scss">
+  .feed-row {
+    cursor: pointer;
+    position: relative;
+    overflow: hidden;
+    display: flex;
+    gap: 0.625rem;
+    align-items: center;
+
+    width: 100%;
+    height: 4.5rem;
+    padding: 0.5625rem 0.5rem;
+    border: 0;
+    border-radius: 0.625rem;
+
+    font: inherit;
+    text-align: start;
+    color: var(--color-text);
+
+    background-color: transparent;
+    transition: background-color 0.15s ease;
+
+    --ripple-color: var(--color-interactive-element-hover);
+
+    @media (hover: hover) {
+      &:hover {
+        background-color: var(--color-chat-hover);
+      }
+    }
+
+    &:focus-visible {
+      outline: 2px solid var(--color-primary);
+      outline-offset: -2px;
+    }
+  }
+
+  .avatar {
+    display: flex;
+    flex-shrink: 0;
+    align-items: center;
+    justify-content: center;
+
+    width: 3.375rem;
+    height: 3.375rem;
+    border-radius: 50%;
+
+    font-size: 1.75rem;
+    color: var(--color-white);
+
+    background-color: var(--color-gray);
+  }
+
+  .info {
+    overflow: hidden;
+    display: flex;
+    flex: 1;
+    flex-direction: column;
+
+    min-width: 0;
+  }
+
+  .info-row {
+    display: flex;
+    gap: 0.5rem;
+    align-items: baseline;
+  }
+
+  .title {
+    overflow: hidden;
+    flex: 1;
+
+    font-size: 1rem;
+    font-weight: var(--font-weight-medium);
+    text-overflow: ellipsis;
+    white-space: nowrap;
+  }
+
+  .date {
+    flex-shrink: 0;
+    font-size: 0.75rem;
+    color: var(--color-text-secondary);
+  }
+
+  .subtitle {
+    display: flex;
+    gap: 0.5rem;
+    align-items: center;
+    margin-top: 0.125rem;
+  }
+
+  .preview {
+    overflow: hidden;
+    flex: 1;
+
+    font-size: 0.875rem;
+    color: var(--color-text-secondary);
+    text-overflow: ellipsis;
+    white-space: nowrap;
+
+    :global(.kind) {
+      margin-inline-end: 0.125rem;
+      vertical-align: -0.125rem;
+    }
+  }
+
+  .chat {
+    color: var(--color-text);
+  }
+
+  .struck {
+    text-decoration: line-through;
+  }
+
+  .badge {
+    flex-shrink: 0;
+
+    min-width: 1.5rem;
+    height: 1.5rem;
+    padding: 0 0.4375rem;
+    border-radius: 0.75rem;
+
+    font-size: 0.875rem;
+    font-weight: var(--font-weight-medium);
+    font-variant-numeric: tabular-nums;
+    line-height: 1.5rem;
+    color: var(--color-white);
+    text-align: center;
+
+    background-color: var(--color-gray);
+  }
+</style>

frontend/src/lib/components/feed/FeedText.svelte

@@ -0,0 +1,128 @@
+<script lang="ts">
+  import { mediaUrl } from "#lib/api/client.js";
+  import type { MessageView } from "#lib/api/types.js";
+  import Icon from "#lib/components/ui/Icon.svelte";
+  import { mediaKindLabel } from "#lib/format/media.js";
+  import { t } from "#lib/i18n/locale.svelte.js";
+
+  interface Props {
+    deleted?: boolean;
+    mark?: string;
+    message: MessageView | null;
+    prefix?: string;
+  }
+
+  let { message, deleted = false, mark = "", prefix = "" }: Props = $props();
+
+  const media = $derived(message?.media[0] ?? null);
+  const thumb = $derived(
+    media?.kind === "photo" && media.downloaded && media.id !== null
+      ? mediaUrl(media.id)
+      : null
+  );
+  const kind = $derived.by(() => {
+    if (message?.poll) {
+      return "poll";
+    }
+    if (message?.contact) {
+      return "contact";
+    }
+    if (message?.location) {
+      return "location";
+    }
+    if (message?.sticker) {
+      return "sticker";
+    }
+    return media?.kind ?? (message?.has_media ? "other" : null);
+  });
+  const label = $derived(
+    message?.sticker?.emoji
+      ? `${message.sticker.emoji} ${mediaKindLabel(kind)}`
+      : mediaKindLabel(kind)
+  );
+  const text = $derived(message?.text?.trim() || message?.poll?.question || "");
+  const lead = $derived.by(() => {
+    if (!label || (thumb && text)) {
+      return "";
+    }
+    return text ? `${label}, ` : label;
+  });
+</script>
+
+<span class="feed-text" class:deleted>
+  {#if mark}
+    <span class="mark"><Icon name="delete" size="0.875rem" /> {mark}</span>
+  {/if}
+  {#if prefix}
+    <span class="prefix">{prefix}: </span>
+  {/if}
+  {#if thumb}
+    <img alt="" class="thumb" decoding="async" loading="lazy" src={thumb}>
+  {/if}
+  {#if lead}
+    <span class="label">{lead}</span>
+  {/if}
+  {#if text}
+    <span class="body">{text}</span>
+  {:else if !lead}
+    <span class="empty">{t("feed.noText")}</span>
+  {/if}
+</span>
+
+<style lang="scss">
+  .feed-text {
+    overflow: hidden;
+    display: -webkit-box;
+
+    font-size: 0.9375rem;
+    line-height: 1.25rem;
+    color: var(--color-text-secondary);
+    overflow-wrap: anywhere;
+
+    -webkit-line-clamp: 2;
+    line-clamp: 2;
+    -webkit-box-orient: vertical;
+  }
+
+  .prefix {
+    color: var(--color-text);
+  }
+
+  .mark {
+    margin-inline-end: 0.375rem;
+
+    font-size: 0.8125rem;
+    font-weight: var(--font-weight-medium);
+    color: var(--color-error);
+
+    :global(.icon) {
+      vertical-align: -0.125rem;
+    }
+  }
+
+  .deleted .body,
+  .deleted .label {
+    text-decoration: line-through;
+  }
+
+  .thumb {
+    display: inline-block;
+
+    width: 1.25rem;
+    height: 1.25rem;
+    margin-inline-end: 0.25rem;
+    border-radius: 0.25rem;
+
+    vertical-align: -0.25rem;
+
+    object-fit: cover;
+  }
+
+  .label {
+    color: var(--color-text);
+  }
+
+  .empty {
+    font-style: italic;
+  }
+</style>

frontend/src/lib/components/feed/FeedView.svelte

@@ -0,0 +1,93 @@
+<script lang="ts">
+  import { onMount } from "svelte";
+  import type { FeedItem } from "#lib/api/types.js";
+  import FeedFilters from "#lib/components/feed/FeedFilters.svelte";
+  import FeedList from "#lib/components/feed/FeedList.svelte";
+  import Button from "#lib/components/ui/Button.svelte";
+  import Icon from "#lib/components/ui/Icon.svelte";
+  import { t } from "#lib/i18n/locale.svelte.js";
+  import {
+    type FeedFilter,
+    feed,
+    messageHref,
+  } from "#lib/stores/feed.svelte.js";
+  import { goto } from "$app/navigation";
+  import { page } from "$app/state";
+
+  interface Props {
+    filter: FeedFilter;
+  }
+
+  let { filter }: Props = $props();
+
+  function open(item: FeedItem, messageId: number) {
+    goto(messageHref(page.url, item.chat.chat_id, messageId));
+  }
+
+  onMount(() => {
+    feed.refresh().catch(() => undefined);
+  });
+
+  $effect(() => {
+    const { unseen } = feed;
+    if (unseen && unseen.count > 0) {
+      feed.markSeen(unseen.latest?.at).catch(() => undefined);
+    }
+  });
+</script>
+
+<div class="feed-view">
+  <header class="feed-header">
+    <Button
+      aria-label={t("common.back")}
+      onclick={() => feed.close(page.url)}
+      round
+      smaller
+      variant="translucent"
+    >
+      <Icon name="arrow-left" />
+    </Button>
+    <h2>{t("feed.title")}</h2>
+  </header>
+  <FeedFilters
+    chats={filter.chats}
+    kind={filter.kind}
+    onchats={(chats) => feed.filter(page.url, { ...filter, chats })}
+    onkind={(kind) => feed.filter(page.url, { ...filter, kind })}
+  />
+  <div class="feed-body custom-scroll">
+    <FeedList chats={filter.chats} kind={filter.kind} onopen={open} />
+  </div>
+</div>
+
+<style lang="scss">
+  .feed-view {
+    display: flex;
+    flex-direction: column;
+
+    overflow: hidden;
+    height: 100%;
+  }
+
+  .feed-header {
+    display: flex;
+    flex-shrink: 0;
+    gap: 0.75rem;
+    align-items: center;
+
+    height: var(--header-height);
+    padding: 0 0.625rem;
+    border-bottom: 1px solid var(--color-borders);
+
+    h2 {
+      margin: 0;
+      font-size: 1.25rem;
+      font-weight: var(--font-weight-medium);
+    }
+  }
+
+  .feed-body {
+    overflow-y: auto;
+    flex: 1;
+  }
+</style>

frontend/src/lib/format/datetime.ts

@@ -79,3 +79,8 @@ export function timeZoneLabel(): string {
       .find((part) => part.type === "timeZoneName")?.value ?? browserTimeZone()
   );
 }
+
+export function formatDayTime(iso: string): string {
+  const date = new Date(iso);
+  return `${format("day", date)}, ${format("time", date)}`;
+}

frontend/src/lib/format/diff.ts

@@ -0,0 +1,74 @@
+export interface DiffPart {
+  changed: boolean;
+  text: string;
+}
+
+export interface WordDiff {
+  after: DiffPart[];
+  before: DiffPart[];
+}
+
+const TOKEN = /(\s+)/;
+const MAX_TOKENS = 400;
+
+function tokens(text: string): string[] {
+  return text.split(TOKEN).filter(Boolean);
+}
+
+function push(parts: DiffPart[], text: string, changed: boolean) {
+  const last = parts.at(-1);
+  if (last && last.changed === changed) {
+    last.text += text;
+  } else {
+    parts.push({ changed, text });
+  }
+}
+
+function lcsTable(a: string[], b: string[]): Uint16Array {
+  const width = b.length + 1;
+  const table = new Uint16Array((a.length + 1) * width);
+  for (let i = a.length - 1; i >= 0; i -= 1) {
+    for (let j = b.length - 1; j >= 0; j -= 1) {
+      table[i * width + j] =
+        a[i] === b[j]
+          ? table[(i + 1) * width + j + 1] + 1
+          : Math.max(table[(i + 1) * width + j], table[i * width + j + 1]);
+    }
+  }
+  return table;
+}
+
+export function wordDiff(before: string, after: string): WordDiff | null {
+  const a = tokens(before);
+  const b = tokens(after);
+  if (a.length > MAX_TOKENS || b.length > MAX_TOKENS) {
+    return null;
+  }
+  const table = lcsTable(a, b);
+  const width = b.length + 1;
+  const left: DiffPart[] = [];
+  const right: DiffPart[] = [];
+  let i = 0;
+  let j = 0;
+  while (i < a.length && j < b.length) {
+    if (a[i] === b[j]) {
+      push(left, a[i], false);
+      push(right, b[j], false);
+      i += 1;
+      j += 1;
+    } else if (table[(i + 1) * width + j] >= table[i * width + j + 1]) {
+      push(left, a[i], true);
+      i += 1;
+    } else {
+      push(right, b[j], true);
+      j += 1;
+    }
+  }
+  for (const token of a.slice(i)) {
+    push(left, token, true);
+  }
+  for (const token of b.slice(j)) {
+    push(right, token, true);
+  }
+  return { after: right, before: left };
+}

frontend/src/lib/format/media.ts

@@ -1,27 +1,30 @@
-const MEDIA_KIND_LABELS: Record<string, string> = {
+import { t } from "#lib/i18n/locale.svelte.js";
-  animation: "GIF",
+import type { MessageKey } from "#lib/i18n/messages.js";
-  audio: "Аудио",
+
-  contact: "Контакт",
+const MEDIA_KIND_KEYS: Record<string, MessageKey> = {
-  dice: "Кубик",
+  animation: "media.kind.gif",
-  document: "Файл",
+  audio: "media.kind.audio",
-  game: "Игра",
+  contact: "media.kind.contact",
-  gif: "GIF",
+  dice: "media.kind.dice",
-  location: "Геопозиция",
+  document: "media.kind.document",
-  photo: "Фото",
+  game: "media.kind.game",
-  poll: "Опрос",
+  gif: "media.kind.gif",
-  sticker: "Стикер",
+  location: "media.kind.location",
-  story: "Сторис",
+  photo: "media.kind.photo",
-  venue: "Геопозиция",
+  poll: "media.kind.poll",
-  video: "Видео",
+  sticker: "media.kind.sticker",
-  video_note: "Кружок",
+  story: "media.kind.story",
-  voice: "Голосовое",
+  venue: "media.kind.location",
+  video: "media.kind.video",
+  video_note: "media.kind.videoNote",
+  voice: "media.kind.voice",
 };
 
 export function mediaKindLabel(kind: string | null): string | null {
   if (!kind) {
     return null;
   }
-  return MEDIA_KIND_LABELS[kind] ?? "Медиа";
+  return t(MEDIA_KIND_KEYS[kind] ?? "media.kind.other");
 }
 
 const BYTE_UNITS = ["B", "KB", "MB", "GB"];

frontend/src/lib/i18n/messages.ts

@@ -1,6 +1,7 @@
 import { account } from "#lib/i18n/messages/account.js";
 import { alerts } from "#lib/i18n/messages/alerts.js";
 import { common } from "#lib/i18n/messages/common.js";
+import { feed } from "#lib/i18n/messages/feed.js";
 import { menu } from "#lib/i18n/messages/menu.js";
 import { profile } from "#lib/i18n/messages/profile.js";
 import { read } from "#lib/i18n/messages/read.js";
@@ -11,6 +12,7 @@ export const messages = {
   ...account,
   ...alerts,
   ...common,
+  ...feed,
   ...menu,
   ...profile,
   ...read,

frontend/src/lib/i18n/messages/feed.ts

@@ -0,0 +1,139 @@
+import type { Messages } from "#lib/i18n/types.js";
+
+export const feed = {
+  "chat.analytics": { en: "Analytics", ru: "Аналитика" },
+  "chat.backfill": {
+    en: "Fetch new messages",
+    ru: "Догрузить новые сообщения",
+  },
+  "chat.backfill.failed": {
+    en: "Couldn't start fetching new messages",
+    ru: "Не удалось начать догрузку",
+  },
+  "chat.backfill.started": {
+    en: "Fetching new messages",
+    ru: "Догружаем новые сообщения",
+  },
+  "chat.deletedAccount": { en: "Deleted account", ru: "Удалённый аккаунт" },
+  "chat.fallbackTitle": { en: "Chat {id}", ru: "Чат {id}" },
+  "chat.kind.channel": { en: "channel", ru: "канал" },
+  "chat.kind.group": { en: "group", ru: "группа" },
+  "chat.media": { en: "Media", ru: "Медиа" },
+  "chat.messages": {
+    en: { one: "{count} message", other: "{count} messages" },
+    ru: {
+      few: "{count} сообщения",
+      many: "{count} сообщений",
+      one: "{count} сообщение",
+      other: "{count} сообщения",
+    },
+  },
+  "chat.open": { en: "Open", ru: "Открыть" },
+  "chat.openProfile": { en: "Open profile", ru: "Открыть профиль" },
+  "chat.profile": { en: "Profile", ru: "Профиль" },
+  "chat.search": { en: "Search in chat", ru: "Поиск в чате" },
+  "chat.you": { en: "You", ru: "Вы" },
+  "chats.empty": { en: "No chats yet", ru: "Чатов пока нет" },
+  "chats.emptyFolder": { en: "Empty folder", ru: "Папка пуста" },
+  "chats.emptyFolderHint": {
+    en: "No chats match this folder yet",
+    ru: "В этой папке пока нет чатов",
+  },
+  "chats.foldersFailed": {
+    en: "Couldn't load folders",
+    ru: "Не удалось загрузить папки",
+  },
+  "chats.loadFailed": {
+    en: "Couldn't load chats",
+    ru: "Не удалось загрузить чаты",
+  },
+  "feed.after": { en: "Now", ru: "Стало" },
+  "feed.before": { en: "Was", ru: "Было" },
+  "feed.bulk": {
+    en: { one: "{count} message deleted", other: "{count} messages deleted" },
+    ru: {
+      few: "Удалено {count} сообщения",
+      many: "Удалено {count} сообщений",
+      one: "Удалено {count} сообщение",
+      other: "Удалено {count} сообщения",
+    },
+  },
+  "feed.changes": { en: "Changes", ru: "Изменения" },
+  "feed.chats.channel": { en: "Channels", ru: "Каналы" },
+  "feed.chats.dm": { en: "Private", ru: "Личка" },
+  "feed.chats.group": { en: "Groups", ru: "Группы" },
+  "feed.deleted": { en: "deleted", ru: "удалено" },
+  "feed.edited": { en: "edited", ru: "изменено" },
+  "feed.empty.all": {
+    en: "No deleted or edited messages yet",
+    ru: "Удалённых и изменённых пока нет",
+  },
+  "feed.empty.deleted": {
+    en: "No deleted messages yet",
+    ru: "Удалённых пока нет",
+  },
+  "feed.empty.edited": {
+    en: "No edited messages yet",
+    ru: "Изменённых пока нет",
+  },
+  "feed.error": {
+    en: "Couldn't load the feed",
+    ru: "Не удалось загрузить ленту",
+  },
+  "feed.filter.all": { en: "All", ru: "Все" },
+  "feed.filter.deleted": { en: "Deleted", ru: "Удалённые" },
+  "feed.filter.edited": { en: "Edited", ru: "Изменённые" },
+  "feed.lostText": {
+    en: "The earlier text wasn't saved",
+    ru: "Прежний текст не сохранился",
+  },
+  "feed.markSeen": { en: "Mark as seen", ru: "Отметить просмотренным" },
+  "feed.mediaChanged": { en: "Media replaced", ru: "Медиа заменено" },
+  "feed.more": { en: "Show more", ru: "Показать ещё" },
+  "feed.noText": { en: "No text", ru: "Без текста" },
+  "feed.retry": { en: "Retry", ru: "Повторить" },
+  "feed.title": { en: "Feed", ru: "Лента" },
+  "feed.unseen": {
+    en: { one: "{count} new", other: "{count} new" },
+    ru: {
+      few: "{count} новых",
+      many: "{count} новых",
+      one: "{count} новое",
+      other: "{count} новых",
+    },
+  },
+  "feed.versions": { en: "All versions", ru: "Все версии" },
+  "media.kind.audio": { en: "Audio", ru: "Аудио" },
+  "media.kind.contact": { en: "Contact", ru: "Контакт" },
+  "media.kind.dice": { en: "Dice", ru: "Кубик" },
+  "media.kind.document": { en: "File", ru: "Файл" },
+  "media.kind.game": { en: "Game", ru: "Игра" },
+  "media.kind.gif": { en: "GIF", ru: "GIF" },
+  "media.kind.location": { en: "Location", ru: "Геопозиция" },
+  "media.kind.other": { en: "Media", ru: "Медиа" },
+  "media.kind.photo": { en: "Photo", ru: "Фото" },
+  "media.kind.poll": { en: "Poll", ru: "Опрос" },
+  "media.kind.sticker": { en: "Sticker", ru: "Стикер" },
+  "media.kind.story": { en: "Story", ru: "Сторис" },
+  "media.kind.video": { en: "Video", ru: "Видео" },
+  "media.kind.videoNote": { en: "Video message", ru: "Кружок" },
+  "media.kind.voice": { en: "Voice message", ru: "Голосовое" },
+  "panel.allStories": { en: "All stories", ru: "Все сторис" },
+  "panel.annotations": { en: "Notes", ru: "Заметки" },
+  "panel.callbacks": { en: "Callback data", ru: "Callback-данные" },
+  "panel.chatFiles": { en: "Chat files", ru: "Файлы чата" },
+  "panel.links": { en: "Links", ru: "Ссылки" },
+  "panel.reactions": { en: "Reactions", ru: "Реакции" },
+  "panel.search": { en: "Search", ru: "Поиск" },
+  "panel.trash": { en: "Trash", ru: "Корзина" },
+  "panel.versions": { en: "Versions", ru: "Версии" },
+  "thread.loadFailed": {
+    en: "Couldn't load messages",
+    ru: "Не удалось загрузить сообщения",
+  },
+  "thread.notFound": {
+    en: "This message isn't in the archive",
+    ru: "Этого сообщения нет в архиве",
+  },
+  "thread.toLatest": { en: "Jump to latest", ru: "К последним сообщениям" },
+} satisfies Messages;

frontend/src/lib/stores/feed.svelte.ts

@@ -0,0 +1,162 @@
+import { getFeedUnseen, markFeedSeen } from "#lib/api/endpoints.js";
+import type { FeedChatKind, FeedKind, FeedUnseen } from "#lib/api/types.js";
+import { accounts } from "#lib/stores/accounts.svelte.js";
+import { events } from "#lib/stores/events.svelte.js";
+import { browser } from "$app/env";
+import { goto } from "$app/navigation";
+
+const LIVE_DELAY = 600;
+const KIND_PARAM = "feed";
+const CHATS_PARAM = "chats";
+const MESSAGE_PARAM = "message";
+
+export const FEED_KINDS: FeedKind[] = ["all", "deleted", "edited"];
+export const FEED_CHAT_KINDS: FeedChatKind[] = ["dm", "group", "channel"];
+
+export interface FeedFilter {
+  chats: FeedChatKind | null;
+  kind: FeedKind;
+}
+
+interface UrlLike {
+  readonly href: string;
+}
+
+export function feedFilterOf(url: UrlLike): FeedFilter | null {
+  const { searchParams } = new URL(url.href);
+  const kind = searchParams.get(KIND_PARAM);
+  if (!FEED_KINDS.includes(kind as FeedKind)) {
+    return null;
+  }
+  const chats = searchParams.get(CHATS_PARAM);
+  return {
+    chats: FEED_CHAT_KINDS.includes(chats as FeedChatKind)
+      ? (chats as FeedChatKind)
+      : null,
+    kind: kind as FeedKind,
+  };
+}
+
+function withFilter(url: UrlLike, filter: FeedFilter | null): URL {
+  const next = new URL(url.href);
+  next.searchParams.delete(KIND_PARAM);
+  next.searchParams.delete(CHATS_PARAM);
+  next.searchParams.delete(MESSAGE_PARAM);
+  if (filter) {
+    next.searchParams.set(KIND_PARAM, filter.kind);
+    if (filter.chats) {
+      next.searchParams.set(CHATS_PARAM, filter.chats);
+    }
+  }
+  return next;
+}
+
+function href(url: UrlLike): string {
+  const { pathname, search } = new URL(url.href);
+  return `${pathname}${search}`;
+}
+
+export function messageHref(
+  url: UrlLike,
+  chatId: number,
+  messageId: number
+): string {
+  const next = withFilter(url, feedFilterOf(url));
+  next.pathname = `/app/${chatId}`;
+  next.searchParams.set(MESSAGE_PARAM, String(messageId));
+  return href(next);
+}
+
+export function withoutMessage(url: UrlLike): string {
+  const next = new URL(url.href);
+  next.searchParams.delete(MESSAGE_PARAM);
+  return href(next);
+}
+
+function createFeed() {
+  let unseen = $state<FeedUnseen | null>(null);
+  let revision = $state(0);
+  let account: number | null = null;
+  let openedHref: string | null = null;
+  let timer: ReturnType<typeof setTimeout> | null = null;
+
+  async function refresh() {
+    const id = accounts.selectedId;
+    if (id === null) {
+      unseen = null;
+      return;
+    }
+    const next = await getFeedUnseen();
+    if (accounts.selectedId === id) {
+      unseen = next;
+    }
+  }
+
+  function schedule() {
+    if (timer !== null) {
+      return;
+    }
+    timer = setTimeout(() => {
+      timer = null;
+      revision += 1;
+      refresh().catch(() => undefined);
+    }, LIVE_DELAY);
+  }
+
+  if (browser) {
+    events.subscribe((event) => {
+      if (event.type === "delete" || event.type === "edit") {
+        schedule();
+      }
+    });
+    events.onReconnect(schedule);
+  }
+
+  return {
+    async close(url: UrlLike) {
+      if (openedHref === href(url)) {
+        openedHref = null;
+        history.back();
+        return;
+      }
+      await goto(href(withFilter(url, null)), { replace: true, reset: false });
+    },
+    async filter(url: UrlLike, filter: FeedFilter) {
+      const wasOpened = openedHref === href(url);
+      const target = href(withFilter(url, filter));
+      if (wasOpened) {
+        openedHref = target;
+      }
+      await goto(target, { replace: true, reset: false });
+    },
+    async markSeen(at?: string) {
+      const id = accounts.selectedId;
+      const next = await markFeedSeen(at);
+      if (accounts.selectedId === id) {
+        unseen = next;
+      }
+    },
+    async open(url: UrlLike) {
+      const target = href(withFilter(url, { chats: null, kind: "all" }));
+      openedHref = target;
+      await goto(target, { reset: false });
+    },
+    refresh,
+    get revision() {
+      return revision;
+    },
+    sync() {
+      if (accounts.selectedId === account) {
+        return;
+      }
+      account = accounts.selectedId;
+      unseen = null;
+      refresh().catch(() => undefined);
+    },
+    get unseen() {
+      return unseen;
+    },
+  };
+}
+
+export const feed = createFeed();

frontend/src/lib/stores/ui.svelte.ts

@@ -1,4 +1,5 @@
 export type RightPanel =
+  | "changes"
   | "profile"
   | "search"
   | "versions"

frontend/src/routes/app/+layout.svelte

@@ -4,6 +4,7 @@
   import { fly } from "svelte/transition";
   import ChatList from "#lib/components/ChatList.svelte";
   import FolderTabs from "#lib/components/FolderTabs.svelte";
+  import FeedView from "#lib/components/feed/FeedView.svelte";
   import MainMenu from "#lib/components/MainMenu.svelte";
   import PolicyDialog from "#lib/components/policy/PolicyDialog.svelte";
   import RightColumn from "#lib/components/RightColumn.svelte";
@@ -18,6 +19,7 @@
   import { ALERTS_PARAM } from "#lib/stores/alerts.svelte.js";
   import { auth } from "#lib/stores/auth.svelte.js";
   import { events } from "#lib/stores/events.svelte.js";
+  import { feedFilterOf } from "#lib/stores/feed.svelte.js";
   import { search } from "#lib/stores/search.svelte.js";
   import { shareUi } from "#lib/stores/shares.svelte.js";
   import { toasts } from "#lib/stores/toasts.svelte.js";
@@ -28,6 +30,7 @@
 
   // biome-ignore lint/suspicious/noEqualsToNull: route params are undefined when absent
   const chatOpen = $derived(page.params.chatId != null);
+  const feedFilter = $derived(feedFilterOf(page.url));
 
   $effect(() => {
     if (!accounts.loaded) {
@@ -81,6 +84,13 @@
       >
         <Settings />
       </div>
+    {:else if feedFilter}
+      <div
+        class="left-view"
+        in:fly={{ duration: 200, easing: cubicOut, x: 64 }}
+      >
+        <FeedView filter={feedFilter} />
+      </div>
     {:else}
       <div
         class="left-view"

frontend/src/routes/app/[chatId]/+page.svelte

@@ -1,11 +1,16 @@
 <script lang="ts">
+  import { untrack } from "svelte";
   import ChatHeader from "#lib/components/ChatHeader.svelte";
   import MessageList from "#lib/components/MessageList.svelte";
   import { accounts } from "#lib/stores/accounts.svelte.js";
   import { chats } from "#lib/stores/chats.svelte.js";
+  import { withoutMessage } from "#lib/stores/feed.svelte.js";
+  import { ui } from "#lib/stores/ui.svelte.js";
+  import { goto } from "$app/navigation";
   import { page } from "$app/state";
 
   const chatId = $derived(Number(page.params.chatId));
+  const linkedMessage = $derived(page.url.searchParams.get("message"));
 
   $effect(() => {
     if (accounts.selectedId === null) {
@@ -14,6 +19,19 @@
     chats.ensure(chatId);
     chats.enrich(chatId);
   });
+
+  $effect(() => {
+    if (linkedMessage === null) {
+      return;
+    }
+    const messageId = Number(linkedMessage);
+    untrack(() => {
+      if (Number.isSafeInteger(messageId)) {
+        ui.requestJump(chatId, messageId);
+      }
+      goto(withoutMessage(page.url), { replace: true, reset: false });
+    });
+  });
 </script>
 
 <div class="chat-view">