feat(frontend): my message menu shows when it was read or listened, group readers open in a right panel

frontend/src/lib/components/RightColumn.svelte

@@ -8,6 +8,7 @@
   import PolicyEditor from "#lib/components/policy/PolicyEditor.svelte";
   import AnalyticsPanel from "#lib/components/presence/AnalyticsPanel.svelte";
   import ProfilePanel from "#lib/components/profile/ProfilePanel.svelte";
+  import ReadersPanel from "#lib/components/read/ReadersPanel.svelte";
   import ChatSearchPanel from "#lib/components/search/ChatSearchPanel.svelte";
   import SharesPanel from "#lib/components/shares/SharesPanel.svelte";
   import CallbacksPanel from "#lib/components/social/CallbacksPanel.svelte";
@@ -18,13 +19,14 @@
   import Button from "#lib/components/ui/Button.svelte";
   import Icon from "#lib/components/ui/Icon.svelte";
   import WatchesPanel from "#lib/components/watches/WatchesPanel.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 { 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> = {
+  const titles: Record<RightPanel, string> = $derived({
     alerts: "Алерты",
     annotations: "Заметки",
     bots: "Боты",
@@ -35,6 +37,7 @@
     presence: "Аналитика",
     profile: "Профиль",
     reactions: "Реакции",
+    readers: t("read.readers.title"),
     search: "Поиск",
     shares: "Файлы по ссылке",
     storage: "Хранилище",
@@ -44,7 +47,7 @@
     "stories-all": "Все сторис",
     versions: "Версии",
     watches: "Отслеживания",
-  };
+  });
 
   const parents: Partial<Record<RightPanel, RightPanel>> = {
     "storage-chat": "storage",
@@ -104,6 +107,8 @@
     <ChatSearchPanel />
   {:else if ui.rightPanel === "reactions"}
     <ReactionsPanel />
+  {:else if ui.rightPanel === "readers"}
+    <ReadersPanel />
   {:else if ui.rightPanel === "callbacks"}
     <CallbacksPanel />
   {:else if ui.rightPanel === "links"}