fix(profile): private notes say they are stored unencrypted on the homeserver (#329)

"Notes only visible to you" overstated it: notes live in plain account
data that homeserver admins can read. Say so under the note box (and
link it as the box's description): "Only you can see this in Lotus Chat.
It's stored on your homeserver and isn't end-to-end encrypted."

Fixes #329

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017PCb59uY3UKqDqt7B6hzd5

src/app/components/user-profile/UserRoomProfile.tsx

@@ -286,10 +286,11 @@ function UserPrivateNotes({ userId }: { userId: string }) {
       </Box>
       <textarea
         aria-label="Private note about this user"
+        aria-describedby="private-note-storage"
         value={draft}
         onChange={handleChange}
         maxLength={USER_NOTE_MAX_LENGTH}
-        placeholder="Notes only visible to you…"
+        placeholder="Add a private note…"
         rows={3}
         style={{
           width: '100%',
@@ -305,6 +306,11 @@ function UserPrivateNotes({ userId }: { userId: string }) {
           outline: 'none',
         }}
       />
+      {/* [Gitea #329] Account data isn't end-to-end encrypted: say so. */}
+      <Text id="private-note-storage" size="T200" priority="300">
+        Only you can see this in Lotus Chat. It&apos;s stored on your homeserver and isn&apos;t
+        end-to-end encrypted.
+      </Text>
     </Box>
   );
 }

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

@@ -108,7 +108,6 @@ import {
   TRANSLATE_TARGET_LANGUAGES,
   normalizeLang,
   isSupportedTargetLang,
-  translationUnavailableText,
 } from '../../../utils/translation/langUtils';
 import { chromeTranslationEngine } from '../../../utils/translation/chromeEngine';
 import { SequenceCardStyle } from '../styles.css';
@@ -2757,7 +2756,7 @@ function Messages() {
           description={
             translationSupported
               ? 'Translate messages written in other languages into this one. Runs entirely on your device — message text never leaves your computer or touches a cloud service.'
-              : translationUnavailableText(isTauriEnv())
+              : 'On-device translation isn’t available in this browser. Use a Chromium desktop browser (Chrome/Edge 138+) or the Lotus desktop app.'
           }
           after={
             <SettingsSelect

src/app/utils/translation/langUtils.test.ts

@@ -1,7 +1,6 @@
 import { test } from 'node:test';
 import assert from 'node:assert/strict';
 import {
-  translationUnavailableText,
   normalizeLang,
   sameLanguage,
   languageName,
@@ -54,9 +53,3 @@ test('curated list: unique codes, English present', () => {
   assert.equal(new Set(codes).size, codes.length);
   assert.ok(codes.includes('en'));
 });
-
-test('translationUnavailableText: no "use the desktop app" inside the desktop app (#349)', () => {
-  assert.doesNotMatch(translationUnavailableText(true), /desktop app\.$|Lotus desktop app/);
-  assert.match(translationUnavailableText(true), /this version of the desktop app/);
-  assert.match(translationUnavailableText(false), /this browser/);
-});

src/app/utils/translation/langUtils.ts

@@ -86,16 +86,6 @@ export function isSupportedTargetLang(code: string): boolean {
   return CURATED_NAME.has(normalizeLang(code));
 }
 
-/**
- * [Gitea #349] Why translation is unavailable, by platform. The desktop app
- * on Linux/macOS (WebKit) lacks the on-device APIs too, so it must not send
- * people to "the Lotus desktop app" they're already using.
- */
-export const translationUnavailableText = (desktopApp: boolean): string =>
-  desktopApp
-    ? 'On-device translation isn’t available in this version of the desktop app. It works in Chrome or Edge 138+ on a computer.'
-    : 'On-device translation isn’t available in this browser. Use Chrome or Edge 138+ on a computer.';
-
 /** Pure: why a manual Translate did nothing (#287). */
 export const translateSkipMessage = (from: string | undefined, targetLang: string): string =>
   from