feat(frontend): right panel lives in browser history and back closes it first, message panels close on chat switch, hotkeys for search, chats, in-chat search and closing

frontend/src/app.d.ts

@@ -1,13 +1,14 @@
-// See https://svelte.dev/docs/kit/types#app.d.ts
-// for information about these interfaces
+import type { PanelState } from "#lib/stores/ui.svelte.js";
+
 declare global {
   namespace App {
     // interface Error {}
     // interface Locals {}
     // interface PageData {}
-    // interface PageState {}
+    interface PageState {
+      inApp?: boolean;
+      panel?: PanelState;
+    }
     // interface Platform {}
   }
 }
-
-export {};

frontend/src/lib/api/capture.ts

@@ -0,0 +1,32 @@
+import { request } from "#lib/api/client.js";
+import type { PresenceSample } from "#lib/api/types.js";
+
+export interface CaptureStatus {
+  last_seen: string | null;
+  live: boolean;
+  since: string | null;
+}
+
+export interface CaptureGap {
+  end: string;
+  start: string;
+}
+
+export function getCaptureStatus(accountId: number): Promise<CaptureStatus> {
+  return request<CaptureStatus>("/capture/status", {
+    query: { account_id: accountId },
+  });
+}
+
+export function getCaptureGaps(accountId: number): Promise<CaptureGap[]> {
+  return request<CaptureGap[]>("/capture/gaps", {
+    query: { account_id: accountId },
+  });
+}
+
+export function getOnline(peerIds: number[]): Promise<PresenceSample[]> {
+  return request<PresenceSample[]>("/presence/online", {
+    account: true,
+    query: { peer_ids: peerIds.join(",") },
+  });
+}

frontend/src/lib/api/notes.ts

@@ -0,0 +1,31 @@
+import { request } from "#lib/api/client.js";
+import type { Annotation } from "#lib/api/types.js";
+
+export interface Note extends Annotation {
+  chat_has_avatar: boolean;
+  chat_title: string | null;
+  message_date: string | null;
+  message_deleted: boolean;
+  message_has_media: boolean;
+  message_text: string | null;
+}
+
+export interface NoteTag {
+  count: number;
+  tag: string;
+}
+
+export function listNotes(
+  tag: string | null,
+  offset: number,
+  limit: number
+): Promise<Note[]> {
+  return request<Note[]>("/annotations/notes", {
+    account: true,
+    query: { limit, offset, tag },
+  });
+}
+
+export function listNoteTags(): Promise<NoteTag[]> {
+  return request<NoteTag[]>("/annotations/tags", { account: true });
+}

frontend/src/lib/api/types.ts

@@ -45,6 +45,8 @@ export interface Chat {
   is_contact: boolean;
   kind: ChatKind;
   last_date: string | null;
+  last_deleted: boolean;
+  last_message_id: number | null;
   last_sender_id: number | null;
   last_text: string | null;
   message_count: number;
@@ -196,6 +198,7 @@ export interface MessageView {
   entities: EntityView[];
   forward: ForwardView | null;
   has_media: boolean;
+  has_note: boolean;
   inline_buttons: InlineButton[][];
   is_animated_emoji: boolean;
   is_self_destruct: boolean;

frontend/src/lib/components/Hotkeys.svelte

@@ -0,0 +1,104 @@
+<script lang="ts">
+  import { tick } from "svelte";
+  import { chats } from "#lib/stores/chats.svelte.js";
+  import { search } from "#lib/stores/search.svelte.js";
+  import { ui } from "#lib/stores/ui.svelte.js";
+  import { goto } from "$app/navigation";
+  import { page } from "$app/state";
+
+  const EDITABLE = "input, textarea, select, [contenteditable='true']";
+  const LAYERS = "[role='dialog'], [role='alertdialog'], [role='menu']";
+
+  const chatId = $derived(
+    page.params.chatId ? Number(page.params.chatId) : null
+  );
+
+  async function focusIn(selector: string) {
+    await tick();
+    document.querySelector<HTMLInputElement>(selector)?.focus();
+  }
+
+  async function focusSearch() {
+    if (ui.leftView === "settings") {
+      ui.closeSettings();
+    }
+    await focusIn("#LeftColumn .left-header input");
+  }
+
+  function stepChat(step: number) {
+    const { list } = chats;
+    const index = list.findIndex((chat) => chat.chat_id === chatId);
+    if (index === -1 && step < 0) {
+      return;
+    }
+    const target = index === -1 ? list[0] : list[index + step];
+    if (target) {
+      goto(`/app/${target.chat_id}`);
+    }
+  }
+
+  function closeTop(editable: HTMLElement | null) {
+    if (editable) {
+      if (editable.closest("#LeftColumn .left-header")) {
+        search.close();
+      }
+      editable.blur();
+    } else if (ui.rightPanel !== null) {
+      ui.closePanel();
+    } else if (ui.leftView === "settings") {
+      ui.closeSettings();
+    } else if (chatId !== null) {
+      goto("/app");
+    }
+  }
+
+  function onCommand(event: KeyboardEvent): boolean {
+    const key = event.key.toLowerCase();
+    if (key === "k") {
+      focusSearch();
+      return true;
+    }
+    if (key === "f" && chatId !== null) {
+      ui.openPanel("search");
+      focusIn("#RightColumn input");
+      return true;
+    }
+    return false;
+  }
+
+  function onPlain(event: KeyboardEvent): boolean {
+    if (event.key === "/" && !event.altKey) {
+      focusSearch();
+      return true;
+    }
+    if (
+      event.altKey &&
+      (event.key === "ArrowUp" || event.key === "ArrowDown")
+    ) {
+      stepChat(event.key === "ArrowUp" ? -1 : 1);
+      return true;
+    }
+    return false;
+  }
+
+  function onkeydown(event: KeyboardEvent) {
+    if (event.defaultPrevented || document.querySelector(LAYERS)) {
+      return;
+    }
+    const target = event.target as HTMLElement | null;
+    const editable = target?.closest<HTMLElement>(EDITABLE) ?? null;
+    const modified = event.ctrlKey || event.metaKey;
+    if (event.key === "Escape") {
+      closeTop(editable);
+      return;
+    }
+    const handled = modified
+      ? !event.altKey && onCommand(event)
+      : editable === null && onPlain(event);
+    if (handled) {
+      event.preventDefault();
+    }
+  }
+</script>
+
+<svelte:window {onkeydown} />

frontend/src/lib/components/alerts/AlertsPanel.svelte

@@ -22,6 +22,7 @@
     EVENT_ICONS,
   } from "#lib/format/watches.js";
   import { t } from "#lib/i18n/locale.svelte.js";
+  import { replaceParam } from "#lib/params.js";
   import { accounts } from "#lib/stores/accounts.svelte.js";
   import { ALERTS_PARAM, alerts } from "#lib/stores/alerts.svelte.js";
   import { ui } from "#lib/stores/ui.svelte.js";
@@ -48,15 +49,7 @@
   );
 
   function writeParam(value: Filter | null) {
-    const url = new URL(page.url.href);
-    if (value === null) {
-      url.searchParams.delete(ALERTS_PARAM);
-    } else {
-      url.searchParams.set(ALERTS_PARAM, value);
-    }
-    if (url.href !== page.url.href) {
-      goto(url, { replace: true, reset: false });
-    }
+    replaceParam(ALERTS_PARAM, value);
   }
 
   function setFilter(next: Filter) {
@@ -135,10 +128,10 @@
 
   async function openAlert(alert: AlertItem) {
     seen(alert);
-    await goto(alert.path);
     if (isMobile()) {
-      ui.closePanel();
+      ui.resetPanel();
     }
+    await goto(alert.path);
   }
 
   async function seeAll() {

frontend/src/lib/format/capture.ts

@@ -0,0 +1,14 @@
+import type { CaptureStatus } from "#lib/api/capture.js";
+import { formatSince } from "#lib/format/datetime.js";
+import { t } from "#lib/i18n/locale.svelte.js";
+
+export function captureLine(status: CaptureStatus, bot: boolean): string {
+  if (status.live && status.since) {
+    return t("capture.live", { when: formatSince(status.since) });
+  }
+  if (status.last_seen) {
+    const when = formatSince(status.last_seen);
+    return bot ? t("capture.botQuiet", { when }) : t("capture.quiet", { when });
+  }
+  return bot ? t("capture.botNever") : t("capture.never");
+}

frontend/src/lib/format/datetime.ts

@@ -3,6 +3,15 @@ import { locale } from "#lib/i18n/locale.svelte.js";
 const OPTIONS = {
   date: { day: "numeric", month: "short", year: "numeric" },
   day: { day: "numeric", month: "short" },
+  exact: {
+    day: "numeric",
+    hour: "2-digit",
+    minute: "2-digit",
+    month: "long",
+    second: "2-digit",
+    weekday: "long",
+    year: "numeric",
+  },
   full: {
     day: "numeric",
     hour: "2-digit",
@@ -12,6 +21,14 @@ const OPTIONS = {
   },
   longDay: { day: "numeric", month: "long", weekday: "long" },
   offset: { timeZoneName: "shortOffset" },
+  stamp: { day: "numeric", hour: "2-digit", minute: "2-digit", month: "short" },
+  stampYear: {
+    day: "numeric",
+    hour: "2-digit",
+    minute: "2-digit",
+    month: "short",
+    year: "numeric",
+  },
   time: { hour: "2-digit", minute: "2-digit" },
 } satisfies Record<string, Intl.DateTimeFormatOptions>;
 
@@ -47,6 +64,37 @@ export function formatFull(iso: string): string {
   return format("full", new Date(iso));
 }
 
+export function formatExact(iso: string): string {
+  return format("exact", new Date(iso));
+}
+
+function stampKind(date: Date): "stamp" | "stampYear" {
+  return date.getFullYear() === new Date().getFullYear()
+    ? "stamp"
+    : "stampYear";
+}
+
+export function formatStamp(iso: string): string {
+  const date = new Date(iso);
+  return format(stampKind(date), date);
+}
+
+export function formatSince(iso: string): string {
+  const date = new Date(iso);
+  if (date.toDateString() === new Date().toDateString()) {
+    return format("time", date);
+  }
+  return format(stampKind(date), date);
+}
+
+export function formatSpanRange(startIso: string, endIso: string): string {
+  const start = new Date(startIso);
+  const end = new Date(endIso);
+  const kind =
+    start.toDateString() === end.toDateString() ? "time" : stampKind(start);
+  return formatter(kind).formatRange(start, end);
+}
+
 export function formatListDate(iso: string | null): string {
   if (!iso) {
     return "";

frontend/src/lib/i18n/messages.ts

@@ -1,6 +1,8 @@
 import { account } from "#lib/i18n/messages/account.js";
 import { alerts } from "#lib/i18n/messages/alerts.js";
 import { bots } from "#lib/i18n/messages/bots.js";
+import { capture } from "#lib/i18n/messages/capture.js";
+import { chat } from "#lib/i18n/messages/chat.js";
 import { common } from "#lib/i18n/messages/common.js";
 import { feed } from "#lib/i18n/messages/feed.js";
 import { jobs } from "#lib/i18n/messages/jobs.js";
@@ -9,6 +11,7 @@ import { media } from "#lib/i18n/messages/media.js";
 import { menu } from "#lib/i18n/messages/menu.js";
 import { notes } from "#lib/i18n/messages/notes.js";
 import { policy } from "#lib/i18n/messages/policy.js";
+import { panels } from "#lib/i18n/messages/panels.js";
 import { profile } from "#lib/i18n/messages/profile.js";
 import { read } from "#lib/i18n/messages/read.js";
 import { search } from "#lib/i18n/messages/search.js";
@@ -25,6 +28,8 @@ export const messages = {
   ...account,
   ...alerts,
   ...bots,
+  ...capture,
+  ...chat,
   ...common,
   ...feed,
   ...jobs,
@@ -33,6 +38,7 @@ export const messages = {
   ...menu,
   ...notes,
   ...policy,
+  ...panels,
   ...profile,
   ...read,
   ...search,

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

@@ -0,0 +1,24 @@
+import type { Messages } from "#lib/i18n/types.js";
+
+export const capture = {
+  "capture.botNever": {
+    en: "The bot has not connected yet",
+    ru: "Бот ещё не выходил на связь",
+  },
+  "capture.botQuiet": {
+    en: "The bot is silent since {when}",
+    ru: "Бот молчит с {when}",
+  },
+  "capture.live": {
+    en: "Capturing since {when}",
+    ru: "Захват идёт с {when}",
+  },
+  "capture.never": {
+    en: "The userbot has not connected yet",
+    ru: "Юзербот ещё не выходил на связь",
+  },
+  "capture.quiet": {
+    en: "The userbot is silent since {when}",
+    ru: "Юзербот молчит с {when}",
+  },
+} satisfies Messages;

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

@@ -0,0 +1,116 @@
+import type { Messages } from "#lib/i18n/types.js";
+
+export const chat = {
+  "chat.analytics": { en: "Analytics", ru: "Аналитика" },
+  "chat.back": { en: "Back to chats", ru: "Назад к чатам" },
+  "chat.backfill": {
+    en: "Fetch new messages",
+    ru: "Догрузить новые сообщения",
+  },
+  "chat.backfillDone": {
+    en: "New messages are on the way",
+    ru: "Новые сообщения уже догружаются",
+  },
+  "chat.backfillFailed": {
+    en: "Could not start fetching",
+    ru: "Не удалось запустить догрузку",
+  },
+  "chat.calendar": { en: "Jump to date", ru: "Перейти к дате" },
+  "chat.calendar.count": {
+    en: { one: "{count} message", other: "{count} messages" },
+    ru: {
+      few: "{count} сообщения",
+      many: "{count} сообщений",
+      one: "{count} сообщение",
+      other: "{count} сообщения",
+    },
+  },
+  "chat.calendar.nextMonth": { en: "Next month", ru: "Следующий месяц" },
+  "chat.calendar.nextYear": { en: "Next year", ru: "Следующий год" },
+  "chat.calendar.prevMonth": { en: "Previous month", ru: "Предыдущий месяц" },
+  "chat.calendar.prevYear": { en: "Previous year", ru: "Предыдущий год" },
+  "chat.channel": { en: "channel", ru: "канал" },
+  "chat.deletedAccount": { en: "Deleted account", ru: "Удалённый аккаунт" },
+  "chat.deletedAt": { en: "deleted {when}", ru: "удалено {when}" },
+  "chat.deletedPreview": { en: "Deleted", ru: "Удалено" },
+  "chat.edited": { en: "edited", ru: "изменено" },
+  "chat.editedAt": { en: "Edited {when}", ru: "Изменено {when}" },
+  "chat.gap": { en: "archive was off {range}", ru: "архив не писал {range}" },
+  "chat.group": { en: "group", ru: "группа" },
+  "chat.latest": { en: "To the latest messages", ru: "К последним сообщениям" },
+  "chat.links": {
+    en: { one: "{count} link", other: "{count} links" },
+    ru: {
+      few: "{count} ссылки",
+      many: "{count} ссылок",
+      one: "{count} ссылка",
+      other: "{count} ссылки",
+    },
+  },
+  "chat.loadFailed": {
+    en: "Could not load messages",
+    ru: "Не удалось загрузить сообщения",
+  },
+  "chat.media": { en: "Media", ru: "Медиа" },
+  "chat.media.download": { en: "Download {kind}", ru: "Скачать: {kind}" },
+  "chat.media.downloadFailed": {
+    en: "Could not download the file",
+    ru: "Не удалось скачать файл",
+  },
+  "chat.media.file": { en: "File", ru: "Файл" },
+  "chat.media.fullscreen": {
+    en: "Open full screen",
+    ru: "Открыть на весь экран",
+  },
+  "chat.media.photo": { en: "Photo", ru: "Фото" },
+  "chat.media.queue": { en: "Download to archive", ru: "Скачать в архив" },
+  "chat.media.queued": { en: "Queued", ru: "В очереди" },
+  "chat.media.queueFailed": {
+    en: "Could not queue the download",
+    ru: "Не удалось поставить в очередь",
+  },
+  "chat.media.save": { en: "Download file", ru: "Скачать файл" },
+  "chat.media.selfDestruct": {
+    en: "Self-destructing media",
+    ru: "Самоуничтожающееся медиа",
+  },
+  "chat.media.share": { en: "Share by link", ru: "Доступ по ссылке" },
+  "chat.media.tapToDownload": {
+    en: "Tap to download",
+    ru: "Нажмите, чтобы скачать",
+  },
+  "chat.media.versions": { en: "Media versions", ru: "Версии медиа" },
+  "chat.media.video": { en: "Video", ru: "Видео" },
+  "chat.menu.author": { en: "Author's profile", ru: "Профиль автора" },
+  "chat.menu.callbacks": { en: "Callback data", ru: "Callback-данные" },
+  "chat.menu.copied": { en: "Copied", ru: "Скопировано" },
+  "chat.menu.copyId": { en: "Copy ID", ru: "Копировать ID" },
+  "chat.menu.copyLink": { en: "Copy link", ru: "Копировать ссылку" },
+  "chat.menu.copyText": { en: "Copy text", ru: "Копировать текст" },
+  "chat.menu.linkCopied": { en: "Link copied", ru: "Ссылка скопирована" },
+  "chat.menu.links": { en: "Links", ru: "Ссылки" },
+  "chat.menu.notes": { en: "Notes", ru: "Заметки" },
+  "chat.menu.open": { en: "Open", ru: "Открыть" },
+  "chat.menu.policy": { en: "Capture policy", ru: "Политика захвата" },
+  "chat.menu.profile": { en: "Profile", ru: "Профиль" },
+  "chat.menu.reactions": { en: "Reactions", ru: "Реакции" },
+  "chat.menu.reply": { en: "Go to reply", ru: "Перейти к ответу" },
+  "chat.menu.search": { en: "Search in chat", ru: "Поиск в чате" },
+  "chat.menu.stories": { en: "Stories", ru: "Сторис" },
+  "chat.menu.versions": { en: "Versions", ru: "Версии" },
+  "chat.messages": {
+    en: { one: "{count} message", other: "{count} messages" },
+    ru: {
+      few: "{count} сообщения",
+      many: "{count} сообщений",
+      one: "{count} сообщение",
+      other: "{count} сообщения",
+    },
+  },
+  "chat.noText": { en: "No text", ru: "Без текста" },
+  "chat.note": { en: "Note", ru: "Заметка" },
+  "chat.openProfile": { en: "Open profile", ru: "Открыть профиль" },
+  "chat.title": { en: "Chat {id}", ru: "Чат {id}" },
+  "chat.you": { en: "You", ru: "Вы" },
+  "chat.youPrefix": { en: "You: ", ru: "Вы: " },
+} satisfies Messages;

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

@@ -2,10 +2,33 @@ import type { Messages } from "#lib/i18n/types.js";
 
 export const notes = {
   "notes.add": { en: "Add note", ru: "Добавить заметку" },
+  "notes.all": { en: "All", ru: "Все" },
   "notes.edit": { en: "Edit", ru: "Изменить" },
-  "notes.placeholder": {
-    en: "Note on the message…",
-    ru: "Заметка к сообщению…",
+  "notes.empty": {
+    en: "Right-click a message and pick Notes to write one",
+    ru: "Нажмите на сообщение правой кнопкой и выберите «Заметки»",
   },
+  "notes.emptyTag": {
+    en: "No notes with #{tag}",
+    ru: "Нет заметок с #{tag}",
+  },
+  "notes.emptyTitle": { en: "No notes yet", ru: "Заметок пока нет" },
+  "notes.failed": {
+    en: "Could not load notes",
+    ru: "Не удалось загрузить заметки",
+  },
+  "notes.mediaMessage": { en: "Media", ru: "Медиа" },
+  "notes.messageGone": {
+    en: "Message is not in the archive",
+    ru: "Сообщения нет в архиве",
+  },
+  "notes.more": { en: "Show more", ru: "Показать ещё" },
+  "notes.noMessage": {
+    en: "No message selected",
+    ru: "Сообщение не выбрано",
+  },
+  "notes.placeholder": { en: "Note to the message", ru: "Заметка к сообщению" },
+  "notes.retry": { en: "Retry", ru: "Повторить" },
+  "notes.tag": { en: "Notes with #{tag}", ru: "Заметки с #{tag}" },
   "notes.title": { en: "Notes", ru: "Заметки" },
 } satisfies Messages;

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

@@ -0,0 +1,14 @@
+import type { Messages } from "#lib/i18n/types.js";
+
+export const panels = {
+  "panels.callbacks": { en: "Callback data", ru: "Callback-данные" },
+  "panels.links": { en: "Links", ru: "Ссылки" },
+  "panels.presence": { en: "Analytics", ru: "Аналитика" },
+  "panels.profile": { en: "Profile", ru: "Профиль" },
+  "panels.reactions": { en: "Reactions", ru: "Реакции" },
+  "panels.search": { en: "Search", ru: "Поиск" },
+  "panels.storageChat": { en: "Chat files", ru: "Файлы чата" },
+  "panels.stories": { en: "Stories", ru: "Сторис" },
+  "panels.storiesAll": { en: "All stories", ru: "Все сторис" },
+  "panels.trash": { en: "Trash", ru: "Корзина" },
+} satisfies Messages;

frontend/src/lib/params.ts

@@ -0,0 +1,17 @@
+import { goto } from "$app/navigation";
+import { page } from "$app/state";
+
+export async function replaceParam(
+  key: string,
+  value: string | null
+): Promise<void> {
+  const url = new URL(page.url.href);
+  if (value === null) {
+    url.searchParams.delete(key);
+  } else {
+    url.searchParams.set(key, value);
+  }
+  if (url.href !== page.url.href) {
+    await goto(url, { replace: true, reset: false, state: { ...page.state } });
+  }
+}

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

@@ -0,0 +1,59 @@
+import {
+  type CaptureGap,
+  type CaptureStatus,
+  getCaptureGaps,
+  getCaptureStatus,
+} from "#lib/api/capture.js";
+
+const POLL_INTERVAL = 60_000;
+
+function createCapture() {
+  let account: number | null = null;
+  let status = $state<CaptureStatus | null>(null);
+  let gaps = $state.raw<CaptureGap[]>([]);
+  let timer: ReturnType<typeof setInterval> | undefined;
+
+  async function refresh() {
+    const current = account;
+    if (current === null) {
+      return;
+    }
+    const next = await getCaptureStatus(current).catch(() => null);
+    if (next === null || current !== account) {
+      return;
+    }
+    const restarted = next.since !== status?.since;
+    status = next;
+    if (restarted) {
+      const found = await getCaptureGaps(current).catch(() => null);
+      if (found !== null && current === account) {
+        gaps = found;
+      }
+    }
+  }
+
+  return {
+    get gaps(): CaptureGap[] {
+      return gaps;
+    },
+    get status(): CaptureStatus | null {
+      return status;
+    },
+    track(accountId: number | null) {
+      if (accountId === account) {
+        return;
+      }
+      account = accountId;
+      status = null;
+      gaps = [];
+      clearInterval(timer);
+      if (accountId === null) {
+        return;
+      }
+      refresh();
+      timer = setInterval(refresh, POLL_INTERVAL);
+    },
+  };
+}
+
+export const capture = createCapture();

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

@@ -0,0 +1,59 @@
+import { SvelteMap } from "svelte/reactivity";
+import type { MessageView } from "#lib/api/types.js";
+import { accounts } from "#lib/stores/accounts.svelte.js";
+import { ui } from "#lib/stores/ui.svelte.js";
+
+export const NOTES_PARAM = "notes";
+
+const TAG = /(^|[^\p{L}\p{N}_])#([\p{L}\p{N}_]+)/gu;
+
+export type NotePart = { label: string; tag: string } | { text: string };
+
+export function noteParts(text: string): NotePart[] {
+  const parts: NotePart[] = [];
+  let last = 0;
+  for (const match of text.matchAll(TAG)) {
+    const start = match.index + match[1].length;
+    if (start > last) {
+      parts.push({ text: text.slice(last, start) });
+    }
+    parts.push({ label: `#${match[2]}`, tag: match[2].toLowerCase() });
+    last = start + match[2].length + 1;
+  }
+  if (last < text.length) {
+    parts.push({ text: text.slice(last) });
+  }
+  return parts;
+}
+
+function createNotes() {
+  let tag = $state<string | null>(null);
+  const marks = new SvelteMap<string, boolean>();
+
+  function key(chatId: number, messageId: number): string {
+    return `${accounts.selectedId}:${chatId}:${messageId}`;
+  }
+
+  return {
+    has(message: MessageView): boolean {
+      return (
+        marks.get(key(message.chat_id, message.message_id)) ?? message.has_note
+      );
+    },
+    mark(chatId: number, messageId: number, noted: boolean) {
+      marks.set(key(chatId, messageId), noted);
+    },
+    openTag(next: string | null) {
+      tag = next;
+      ui.openPanel("notes");
+    },
+    get tag(): string | null {
+      return tag;
+    },
+    set tag(next: string | null) {
+      tag = next;
+    },
+  };
+}
+
+export const notes = createNotes();

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

@@ -0,0 +1,94 @@
+import { SvelteMap } from "svelte/reactivity";
+import { getOnline } from "#lib/api/capture.js";
+import type { PresenceSample } from "#lib/api/types.js";
+import { accounts } from "#lib/stores/accounts.svelte.js";
+import { events } from "#lib/stores/events.svelte.js";
+
+const CLOCK_INTERVAL = 30_000;
+const BATCH = 200;
+
+function createOnline() {
+  const until = new SvelteMap<number, number>();
+  const asked = new Set<number>();
+  let pending: number[] = [];
+  let account: number | null = null;
+  let now = $state(Date.now());
+  let ticking = false;
+
+  function apply(peerId: number, sample: PresenceSample | null) {
+    const ends = sample?.next_offline_date;
+    if (sample?.status === "online" && ends) {
+      until.set(peerId, new Date(ends).getTime());
+      now = Date.now();
+    } else {
+      until.delete(peerId);
+    }
+  }
+
+  async function ask(ids: number[]) {
+    const current = account;
+    for (let start = 0; start < ids.length; start += BATCH) {
+      // biome-ignore lint/performance/noAwaitInLoops: batches go one after another
+      const samples = await getOnline(ids.slice(start, start + BATCH)).catch(
+        () => []
+      );
+      if (current !== account) {
+        return;
+      }
+      for (const sample of samples) {
+        apply(sample.peer_id, sample);
+      }
+    }
+  }
+
+  function flush() {
+    const ids = pending;
+    pending = [];
+    ask(ids);
+  }
+
+  function syncAccount() {
+    if (accounts.selectedId === account) {
+      return;
+    }
+    account = accounts.selectedId;
+    until.clear();
+    asked.clear();
+    pending = [];
+  }
+
+  events.subscribe((event) => {
+    if (event.type === "presence") {
+      apply(event.peer_id, event.sample);
+    }
+  });
+  events.onReconnect(() => {
+    until.clear();
+    ask([...asked]);
+  });
+
+  return {
+    isOnline(peerId: number): boolean {
+      return (until.get(peerId) ?? 0) > now;
+    },
+    watch(peerId: number) {
+      syncAccount();
+      if (account === null || asked.has(peerId)) {
+        return;
+      }
+      asked.add(peerId);
+      if (pending.length === 0) {
+        queueMicrotask(flush);
+      }
+      pending.push(peerId);
+      if (!ticking) {
+        ticking = true;
+        setInterval(() => {
+          now = Date.now();
+        }, CLOCK_INTERVAL);
+      }
+    },
+  };
+}
+
+export const online = createOnline();

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

@@ -1,13 +1,16 @@
+import { pushState, replaceState } from "$app/navigation";
+import { page } from "$app/state";
+
 export type RightPanel =
   | "changes"
   | "profile"
   | "search"
-  | "versions"
   | "reactions"
   | "readers"
   | "callbacks"
   | "links"
   | "annotations"
+  | "notes"
   | "jobs"
   | "presence"
   | "stories"
@@ -24,32 +27,82 @@ export type RightPanel =
 
 export type LeftView = "main" | "settings";
 
+export interface PanelState {
+  chatId: number | null;
+  messageId: number | null;
+  name: RightPanel;
+  peerId: number | null;
+}
+
 interface JumpTarget {
   chatId: number;
   messageId: number;
 }
 
-interface PersonTarget {
-  chatId: number;
-  peerId: number;
+function currentChat(): number | null {
+  return page.params.chatId ? Number(page.params.chatId) : null;
+}
+
+function samePanel(a: PanelState | null, b: PanelState | null): boolean {
+  return (
+    a?.name === b?.name &&
+    a?.messageId === b?.messageId &&
+    a?.peerId === b?.peerId &&
+    a?.chatId === b?.chatId
+  );
 }
 
 function createUi() {
-  let rightPanel = $state<RightPanel | null>(null);
-  let panelMessageId = $state<number | null>(null);
+  let panel = $state.raw<PanelState | null>(null);
   let leftColumnOpen = $state(true);
   let leftView = $state<LeftView>("main");
   let jumpTarget = $state<JumpTarget | null>(null);
-  let person = $state<PersonTarget | null>(null);
+  let writing: Promise<unknown> = Promise.resolve();
+
+  function queue(step: () => Promise<void> | undefined) {
+    writing = writing.then(step).catch(() => undefined);
+  }
+
+  function record(stay = false) {
+    queue(() => {
+      const next = panel;
+      if (next === null || samePanel(page.state.panel ?? null, next)) {
+        return;
+      }
+      const fresh = page.state.panel === undefined && !stay;
+      return (fresh ? pushState : replaceState)("", {
+        ...page.state,
+        panel: next,
+      });
+    });
+  }
+
+  function markInApp() {
+    queue(() => {
+      if (page.state.inApp) {
+        return;
+      }
+      return replaceState("", { ...page.state, inApp: true });
+    });
+  }
+
+  function show(next: PanelState) {
+    panel = next;
+    record();
+  }
 
   return {
     clearJump() {
       jumpTarget = null;
     },
     closePanel() {
-      rightPanel = null;
-      panelMessageId = null;
-      person = null;
+      if (panel === null) {
+        return;
+      }
+      panel = null;
+      if (page.state.panel !== undefined) {
+        history.back();
+      }
     },
     closeSettings() {
       leftView = "main";
@@ -63,43 +116,60 @@ function createUi() {
     get leftView() {
       return leftView;
     },
-    openMessagePanel(panel: RightPanel, messageId: number) {
-      rightPanel = panel;
-      panelMessageId = messageId;
+    markInApp,
+    openMessagePanel(name: RightPanel, messageId: number) {
+      show({ chatId: currentChat(), messageId, name, peerId: null });
     },
-    openPanel(panel: RightPanel) {
-      rightPanel = panel;
-      panelMessageId = null;
-      person = null;
+    openPanel(name: RightPanel) {
+      show({ chatId: null, messageId: null, name, peerId: null });
     },
     openPerson(chatId: number, peerId: number) {
-      rightPanel = "profile";
-      panelMessageId = null;
-      person = { chatId, peerId };
+      show({ chatId, messageId: null, name: "profile", peerId });
     },
     openSettings() {
       leftView = "settings";
     },
+    get panel() {
+      return panel;
+    },
     get panelMessageId() {
-      return panelMessageId;
+      return panel?.messageId ?? null;
     },
     personIn(chatId: number | null): number | null {
-      return person !== null && person.chatId === chatId ? person.peerId : null;
+      return panel !== null && panel.peerId !== null && panel.chatId === chatId
+        ? panel.peerId
+        : null;
     },
+    record,
     requestJump(chatId: number, messageId: number) {
       jumpTarget = { chatId, messageId };
     },
+    resetPanel() {
+      panel = null;
+    },
+    restore(next: PanelState | null) {
+      if (!samePanel(panel, next)) {
+        panel = next;
+      }
+    },
     get rightPanel() {
-      return rightPanel;
+      return panel?.name ?? null;
     },
     setChat(chatId: number | null) {
-      if (person !== null && person.chatId !== chatId) {
-        person = null;
+      if (panel === null || panel.chatId === null || panel.chatId === chatId) {
+        return;
       }
+      panel =
+        panel.messageId === null
+          ? { ...panel, chatId: null, peerId: null }
+          : null;
     },
     setLeftColumn(open: boolean) {
       leftColumnOpen = open;
     },
+    settled(): Promise<unknown> {
+      return writing;
+    },
     toggleLeftColumn() {
       leftColumnOpen = !leftColumnOpen;
     },

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

@@ -5,6 +5,7 @@
   import ChatList from "#lib/components/ChatList.svelte";
   import FolderTabs from "#lib/components/FolderTabs.svelte";
   import FeedView from "#lib/components/feed/FeedView.svelte";
+  import Hotkeys from "#lib/components/Hotkeys.svelte";
   import MainMenu from "#lib/components/MainMenu.svelte";
   import PolicyDialog from "#lib/components/policy/PolicyDialog.svelte";
   import RightColumn from "#lib/components/RightColumn.svelte";
@@ -18,12 +19,15 @@
   import { accounts } from "#lib/stores/accounts.svelte.js";
   import { ALERTS_PARAM } from "#lib/stores/alerts.svelte.js";
   import { auth } from "#lib/stores/auth.svelte.js";
+  import { capture } from "#lib/stores/capture.svelte.js";
   import { events } from "#lib/stores/events.svelte.js";
   import { feedFilterOf } from "#lib/stores/feed.svelte.js";
+  import { NOTES_PARAM, notes } from "#lib/stores/notes.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";
-  import { ui } from "#lib/stores/ui.svelte.js";
+  import { type PanelState, ui } from "#lib/stores/ui.svelte.js";
+  import { afterNavigate, beforeNavigate } from "$app/navigation";
   import { page } from "$app/state";
 
   let { children } = $props();
@@ -42,6 +46,56 @@
     events.open(auth.token === null ? null : accounts.selectedId);
   });
 
+  $effect(() => {
+    capture.track(auth.token === null ? null : accounts.selectedId);
+  });
+
+  let carrying = false;
+  let seenPanel: PanelState | null = null;
+
+  $effect(() => {
+    const next = page.state.panel ?? null;
+    untrack(() => {
+      const changed = JSON.stringify(next) !== JSON.stringify(seenPanel);
+      seenPanel = next;
+      if (changed && !carrying) {
+        ui.restore(next);
+      }
+    });
+  });
+
+  beforeNavigate((navigation) => {
+    if (navigation.shallow || navigation.type === "popstate") {
+      return;
+    }
+    carrying = ui.rightPanel !== null;
+    navigation.complete.catch(() => {
+      carrying = false;
+    });
+  });
+
+  afterNavigate((navigation) => {
+    if (
+      navigation.shallow ||
+      navigation.type === "popstate" ||
+      navigation.type === "enter"
+    ) {
+      return;
+    }
+    ui.setChat(page.params.chatId ? Number(page.params.chatId) : null);
+    const from = navigation.from?.url?.pathname;
+    const moved = Boolean(from) && from !== navigation.to?.url?.pathname;
+    if (moved) {
+      ui.markInApp();
+    }
+    if (carrying) {
+      ui.record(!moved);
+    }
+    ui.settled().then(() => {
+      carrying = false;
+    });
+  });
+
   $effect(() => {
     const chatId = page.params.chatId ? Number(page.params.chatId) : null;
     untrack(() => {
@@ -59,14 +113,17 @@
     }
     shownAccount = id;
     untrack(() => {
-      ui.closePanel();
+      ui.resetPanel();
       search.reset();
     });
   });
 
   onMount(() => {
+    const tag = page.url.searchParams.get(NOTES_PARAM);
     if (page.url.searchParams.has(ALERTS_PARAM)) {
       ui.openPanel("alerts");
+    } else if (tag !== null) {
+      notes.openTag(tag || null);
     }
   });
 </script>
@@ -136,6 +193,8 @@
   {/if}
 </div>
 
+<Hotkeys />
+
 <PolicyDialog />
 
 <ShareDialog