refactor(settings): drop three orphan settings with no UI and strip them via a one-shot migration

src/app/features/room/RoomTimeline.tsx

@@ -564,9 +564,12 @@ export function RoomTimeline({
   const [hideNickAvatarEvents] = useSetting(settingsAtom, 'hideNickAvatarEvents');
   const [mediaAutoLoad] = useSetting(settingsAtom, 'mediaAutoLoad');
   const [urlPreview] = useSetting(settingsAtom, 'urlPreview');
-  const [encUrlPreview] = useSetting(settingsAtom, 'encUrlPreview');
-  const showUrlPreview = room.hasEncryptionStateEvent() ? encUrlPreview : urlPreview;
-  const [showHiddenEvents] = useSetting(settingsAtom, 'showHiddenEvents');
+  // Encrypted rooms never auto-preview URLs (privacy-safe default; the
+  // `encUrlPreview` opt-in setting was removed). Plaintext rooms honour urlPreview.
+  const showUrlPreview = room.hasEncryptionStateEvent() ? false : urlPreview;
+  // Hidden/redacted "dev view" of events — was an orphan setting with no UI,
+  // permanently off. Pinned false; the hidden-event renderers below stay inert.
+  const showHiddenEvents = false;
   const [showDeveloperTools] = useSetting(settingsAtom, 'developerTools');
 
   const ignoredUsersList = useIgnoredUsers();

src/app/features/room/ThreadDrawer.tsx

@@ -306,9 +306,9 @@ export function ThreadDrawer({
   const useAuthentication = useMediaAuthentication();
   const [mediaAutoLoad] = useSetting(settingsAtom, 'mediaAutoLoad');
   const [urlPreview] = useSetting(settingsAtom, 'urlPreview');
-  const [encUrlPreview] = useSetting(settingsAtom, 'encUrlPreview');
   const [hideActivity] = useSetting(settingsAtom, 'hideActivity');
-  const showUrlPreview = room.hasEncryptionStateEvent() ? encUrlPreview : urlPreview;
+  // Encrypted rooms never auto-preview URLs (the `encUrlPreview` opt-in was removed).
+  const showUrlPreview = room.hasEncryptionStateEvent() ? false : urlPreview;
 
   const unreadThreadingEnabled = useUnreadThreadingEnabled();
 

src/app/features/room/message/MessageEditor.tsx

@@ -68,9 +68,10 @@ export const MessageEditor = as<'div', MessageEditorProps>(
     const mx = useMatrixClient();
     const editor = useEditor();
     const [enterForNewline] = useSetting(settingsAtom, 'enterForNewline');
-    const [globalToolbar] = useSetting(settingsAtom, 'editorToolbar');
     const [isMarkdown] = useSetting(settingsAtom, 'isMarkdown');
-    const [toolbar, setToolbar] = useState(globalToolbar);
+    // The edit toolbar starts collapsed (the `editorToolbar` opt-in setting was
+    // removed — it only ever gated this one initial-open flag).
+    const [toolbar, setToolbar] = useState(false);
     const isComposing = useComposingCheck();
 
     const [autocompleteQuery, setAutocompleteQuery] =

src/app/state/settings.ts

@@ -8,7 +8,6 @@ export interface Settings {
   themeId?: ThemeId;
   useSystemTheme: boolean;
   isMarkdown: boolean;
-  editorToolbar: boolean;
   twitterEmoji: boolean;
   pageZoom: number;
   hideActivity: boolean;
@@ -20,8 +19,6 @@ export interface Settings {
   hideNickAvatarEvents: boolean;
   mediaAutoLoad: boolean;
   urlPreview: boolean;
-  encUrlPreview: boolean;
-  showHiddenEvents: boolean;
 
   isNotificationSounds: boolean;
   inviteSpamFilter: boolean;
@@ -34,12 +31,12 @@ export interface Settings {
 const DAWN_MIGRATION_KEY = 'dawn-redesign-v1';
 const P3C_CLEANUP_KEY = 'dawn-p3c-cleanup';
 const SYSTEM_TIME_FORMAT_CLEANUP_KEY = 'system-time-format-cleanup';
+const ORPHAN_SETTINGS_CLEANUP_KEY = 'dawn-orphan-settings-cleanup';
 
 const defaultSettings: Settings = {
   themeId: undefined,
   useSystemTheme: true,
   isMarkdown: true,
-  editorToolbar: false,
   twitterEmoji: false,
   pageZoom: 100,
   hideActivity: false,
@@ -51,8 +48,6 @@ const defaultSettings: Settings = {
   hideNickAvatarEvents: true,
   mediaAutoLoad: true,
   urlPreview: true,
-  encUrlPreview: false,
-  showHiddenEvents: false,
 
   isNotificationSounds: true,
   inviteSpamFilter: true,
@@ -125,6 +120,23 @@ export const getSettings = (): Settings => {
     setSettings(merged);
   }
 
+  // Dawn remnant sweep: strip the three orphan settings that had no UI toggle
+  // and were frozen at their defaults forever — `editorToolbar` (only ever
+  // pre-opened the edit overlay's toolbar), `encUrlPreview` (encrypted rooms now
+  // never auto-preview, privacy-safe) and `showHiddenEvents` (the dev-only hidden
+  // -event view, permanently off). One-shot strip of the stale persisted keys.
+  if (!merged.migrationsApplied?.[ORPHAN_SETTINGS_CLEANUP_KEY]) {
+    const orphan = merged as unknown as Record<string, unknown>;
+    delete orphan.editorToolbar;
+    delete orphan.encUrlPreview;
+    delete orphan.showHiddenEvents;
+    merged.migrationsApplied = {
+      ...(merged.migrationsApplied ?? {}),
+      [ORPHAN_SETTINGS_CLEANUP_KEY]: true,
+    };
+    setSettings(merged);
+  }
+
   return merged;
 };