The Android app updates itself from our Gitea releases; feed cards fade in instead of bouncing

- API: GET /app/android/latest reads the latest Gitea release (ANDROID_RELEASES_URL, optional token for a
  private repo) with the APK's SHA-256 from SHA256SUMS; GET /app/android/apk/:name streams that APK.
- App (modules/updater): downloads in the background, checks the SHA-256, and installs through
  PackageInstaller: quietly once when leaving the app (Android 12+), otherwise from the feed banner or
  Settings > App version. F-Droid builds leave it out and drop the install permissions.
- CI: the release notes come from the fastlane changelog; the app shows the part above ---.
- Settings: Create-account and Link Spotify buttons for Last.fm and ListenBrainz.

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

apps/mobile/src/app/(tabs)/settings.tsx

@@ -26,10 +26,11 @@ import { api } from '@/lib/api';
 import { WEB_URL } from '@/lib/config';
 import { showError } from '@/lib/errors';
 import { AppleMusicPermissionError, appleMusicAvailable, connectAppleMusic } from '@/lib/appleMusic';
-import { SignInError, openSpotifyLinkPage, signInWithService } from '@/lib/connect';
+import { SignInError, openSignupPage, openSpotifyLinkPage, signInWithService } from '@/lib/connect';
 import { openReaderSettings, useReader } from '@/lib/nowPlayingReader';
 import { NTFY_URL, disablePush, enablePush, pushAvailable, usePushStatus } from '@/lib/push';
 import { useSession } from '@/lib/session';
+import { checkForUpdate, currentVersion, installUpdate, updaterAvailable, useUpdateState } from '@/lib/updates';
 import { colors, radius, space } from '@/lib/theme';
 
 export default function SettingsScreen() {
@@ -44,6 +45,7 @@ export default function SettingsScreen() {
       <ThisPhone />
       <Connections />
       <FeaturedPicker />
+      <AppVersion />
       <Account />
     </Screen>
   );
@@ -289,6 +291,7 @@ function Connections() {
     });
 
   const linkSpotifyOnLastfm = () => openSpotifyLinkPage('lastfm').catch((e) => showError(e));
+  const linkSpotifyOnListenBrainz = () => openSpotifyLinkPage('listenbrainz').catch((e) => showError(e));
   const spotifyLinked = byProvider.has('lastfm') || byProvider.has('listenbrainz');
 
   const disconnect = (provider: NowPlayingProvider) =>
@@ -382,8 +385,10 @@ function Connections() {
             <Button small variant="primary" title="Sign in" onPress={() => connectOAuth('lastfm')} />
           )}
         </View>
-        {byProvider.has('lastfm') && (
+        {byProvider.has('lastfm') ? (
           <Button small title="Link Spotify to Last.fm" onPress={linkSpotifyOnLastfm} style={{ alignSelf: 'flex-start' }} />
+        ) : (
+          <Button small title="No account? Create one" onPress={() => openSignupPage('lastfm')} style={{ alignSelf: 'flex-start' }} />
         )}
       </View>
 
@@ -393,6 +398,7 @@ function Connections() {
         active={byProvider.has('listenbrainz')}
         onConnect={(username) => run(() => api.connectUsername('listenbrainz', username))}
         onDisconnect={() => disconnect('listenbrainz')}
+        onLinkSpotify={linkSpotifyOnListenBrainz}
       />
 
       <JellyfinConnection
@@ -417,12 +423,14 @@ function UsernameConnection({
   active,
   onConnect,
   onDisconnect,
+  onLinkSpotify,
 }: {
   provider: 'lastfm' | 'listenbrainz';
   status: React.ReactNode;
   active: boolean;
   onConnect: (username: string) => Promise<void>;
   onDisconnect: () => void;
+  onLinkSpotify: () => void;
 }) {
   const [username, setUsername] = useState('');
   const [busy, setBusy] = useState(false);
@@ -454,6 +462,18 @@ function UsernameConnection({
           />
         </Row>
       )}
+      {active ? (
+        <Button small title={`Link Spotify to ${SERVICE_LABELS[provider]}`} onPress={onLinkSpotify} style={{ alignSelf: 'flex-start' }} />
+      ) : (
+        <>
+          <Button small title="No account? Create one" onPress={() => openSignupPage(provider)} style={{ alignSelf: 'flex-start' }} />
+          {provider === 'listenbrainz' && (
+            <Body muted style={styles.small}>
+              ListenBrainz uses MusicBrainz accounts: create one there, then sign in to ListenBrainz once.
+            </Body>
+          )}
+        </>
+      )}
     </View>
   );
 }
@@ -514,6 +534,58 @@ function JellyfinConnection({
   );
 }
 
+/** This build's version, and checking for a newer one (our own APKs; F-Droid updates its builds itself). */
+function AppVersion() {
+  const state = useUpdateState();
+  if (!updaterAvailable) return null;
+  const status = (() => {
+    switch (state.status) {
+      case 'checking':
+        return 'Checking for updates…';
+      case 'upToDate':
+        return 'Up to date.';
+      case 'downloading':
+        return `Downloading ${state.update.version}… ${Math.round(state.progress * 100)}%`;
+      case 'ready':
+        return `Version ${state.update.version} is ready to install.`;
+      case 'installing':
+        return `Installing ${state.update.version}…`;
+      case 'error':
+        return state.message;
+      default:
+        return null;
+    }
+  })();
+  return (
+    <Card>
+      <Heading>App version {currentVersion()}</Heading>
+      {status && (
+        <Body muted style={styles.small}>
+          {status}
+        </Body>
+      )}
+      {state.status === 'ready' || state.status === 'installing' ? (
+        <Button
+          small
+          variant="primary"
+          title="Install update"
+          disabled={state.status === 'installing'}
+          onPress={() => installUpdate(true)}
+          style={{ alignSelf: 'flex-start' }}
+        />
+      ) : (
+        <Button
+          small
+          title="Check for updates"
+          loading={state.status === 'checking' || state.status === 'downloading'}
+          onPress={() => checkForUpdate({ force: true })}
+          style={{ alignSelf: 'flex-start' }}
+        />
+      )}
+    </Card>
+  );
+}
+
 function Account() {
   const { me, setMe, signOut } = useSession();
   const resend = async () => {