feat(web): choose where the search sits, and controls no longer select text

- settings get a search position (left, center by default, right); the top bar
  is three zones and the suggestions open towards the free space
- buttons, chips, tabs, menu items and the home screen controls are not
  text-selectable, so clicks and double clicks no longer highlight labels

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

apps/web/src/pages/SettingsPage.tsx

@@ -126,6 +126,19 @@ function AppearanceSection() {
           ]}
         />
       </div>
+      <div className={s.settingRow}>
+        <span>{t('settings.search_position')}</span>
+        <Segmented<'left' | 'center' | 'right'>
+          label={t('settings.search_position')}
+          value={user.ui_prefs.search_position ?? 'center'}
+          onChange={(v) => void setPrefs({ search_position: v })}
+          options={[
+            { value: 'left', label: t('settings.search_left') },
+            { value: 'center', label: t('settings.search_center') },
+            { value: 'right', label: t('settings.search_right') },
+          ]}
+        />
+      </div>
       <div className={s.settingRow}>
         <span>{t('settings.ambient')}</span>
         <Segmented<'on' | 'off'>