feat(P3-6): configurable composer toolbar buttons

Each button (Format, Emoji, Sticker, GIF, Location, Poll, Voice,
Schedule) can be individually hidden in Settings → Editor.
All default to on, stored in composerToolbarButtons object.
getSettings deep-merges the nested object so new buttons default
to true for existing users with saved settings.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/app/features/settings/general/General.tsx

@@ -37,6 +37,7 @@ import { SequenceCard } from '../../../components/sequence-card';
 import { useSetting } from '../../../state/hooks/settings';
 import {
   ChatBackground,
+  ComposerToolbarSettings,
   DateFormat,
   MessageLayout,
   MessageSpacing,
@@ -855,6 +856,14 @@ function Editor() {
   const [enterForNewline, setEnterForNewline] = useSetting(settingsAtom, 'enterForNewline');
   const [isMarkdown, setIsMarkdown] = useSetting(settingsAtom, 'isMarkdown');
   const [editorToolbar, setEditorToolbar] = useSetting(settingsAtom, 'editorToolbar');
+  const [composerToolbarButtons, setComposerToolbarButtons] = useSetting(
+    settingsAtom,
+    'composerToolbarButtons',
+  );
+
+  const toggleToolbarButton = (key: keyof ComposerToolbarSettings) => {
+    setComposerToolbarButtons({ ...composerToolbarButtons, [key]: !composerToolbarButtons[key] });
+  };
 
   return (
     <Box direction="Column" gap="100">
@@ -881,6 +890,90 @@ function Editor() {
           after={<Switch variant="Primary" value={editorToolbar} onChange={setEditorToolbar} />}
         />
       </SequenceCard>
+      <Text size="L400" style={{ marginTop: '8px' }}>Composer Toolbar Buttons</Text>
+      <SequenceCard className={SequenceCardStyle} variant="SurfaceVariant" direction="Column">
+        <SettingTile
+          title="Format Toggle"
+          description="Button to show/hide the text formatting toolbar."
+          after={
+            <Switch
+              variant="Primary"
+              value={composerToolbarButtons?.showFormat ?? true}
+              onChange={() => toggleToolbarButton('showFormat')}
+            />
+          }
+        />
+        <SettingTile
+          title="Emoji"
+          after={
+            <Switch
+              variant="Primary"
+              value={composerToolbarButtons?.showEmoji ?? true}
+              onChange={() => toggleToolbarButton('showEmoji')}
+            />
+          }
+        />
+        <SettingTile
+          title="Sticker"
+          after={
+            <Switch
+              variant="Primary"
+              value={composerToolbarButtons?.showSticker ?? true}
+              onChange={() => toggleToolbarButton('showSticker')}
+            />
+          }
+        />
+        <SettingTile
+          title="GIF"
+          after={
+            <Switch
+              variant="Primary"
+              value={composerToolbarButtons?.showGif ?? true}
+              onChange={() => toggleToolbarButton('showGif')}
+            />
+          }
+        />
+        <SettingTile
+          title="Location"
+          after={
+            <Switch
+              variant="Primary"
+              value={composerToolbarButtons?.showLocation ?? true}
+              onChange={() => toggleToolbarButton('showLocation')}
+            />
+          }
+        />
+        <SettingTile
+          title="Poll"
+          after={
+            <Switch
+              variant="Primary"
+              value={composerToolbarButtons?.showPoll ?? true}
+              onChange={() => toggleToolbarButton('showPoll')}
+            />
+          }
+        />
+        <SettingTile
+          title="Voice Message"
+          after={
+            <Switch
+              variant="Primary"
+              value={composerToolbarButtons?.showVoice ?? true}
+              onChange={() => toggleToolbarButton('showVoice')}
+            />
+          }
+        />
+        <SettingTile
+          title="Schedule Message"
+          after={
+            <Switch
+              variant="Primary"
+              value={composerToolbarButtons?.showSchedule ?? true}
+              onChange={() => toggleToolbarButton('showSchedule')}
+            />
+          }
+        />
+      </SequenceCard>
     </Box>
   );
 }