feat: Settings is one page per section down a left rail, Account first, every setting a row; the profile form no longer saves blanks over your name and email (M503 #5595 #5596 #5597)

- /settings lands on Account: the Android app, profile, password, signed-in
  devices. Then Playback, Appearance, Notifications, Connections, About.
- Each setting is a row (name, one short line, control at the end) in a
  capped-width column; one-of-N choices are a shared Segmented control.
- Collection and Settings share one SectionRail.
- Connections leads ListenBrainz with a status line: not connected,
  connected and not sending, or sending with the last scrobble's age.
- Notifications prints its column labels once; the digest email's
  settings link points at /settings/notifications.
- #5596: the profile form now loads what is stored and sends only the
  fields that changed. It used to start blank, and the server reads a
  blank as "clear", so one Save wiped the display name and email.
- Recommendation metrics moves to Library › Your listening, and Hidden
  tracks gets a Library tab.

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

web/src/lib/components/MobileAppDownload.svelte

@@ -1,19 +1,20 @@
 <script lang="ts">
   import { onMount } from 'svelte';
-  import { Smartphone } from 'lucide-svelte';
+  import { Download, Smartphone } from 'lucide-svelte';
   import { api } from '#lib/api/client.js';
+  import SettingsGroup from '#lib/components/settings/SettingsGroup.svelte';
+  import SettingRow from '#lib/components/settings/SettingRow.svelte';
 
-  // Polls /api/client/version once on mount. Renders nothing on 404
-  // (no bundled APK — graceful degradation in dev / pre-CI images)
-  // or 401 (defensive — caller must be logged in).
+  // The Android app this server bundles, at the top of Settings › Account
+  // (#5595). Polls /api/client/version once on mount. Renders nothing on
+  // 404 (no bundled APK: dev and pre-CI images) or 401.
   //
   // The /api/client/* endpoints are auth-gated to prevent anonymous
-  // bandwidth abuse on the APK stream, so this component only shows
-  // for logged-in users. Mount in Settings, never in pre-auth surfaces.
+  // bandwidth abuse on the APK stream, so this only shows to a signed-in
+  // user. Mount in Settings, never on a pre-auth page.
 
   // Server returns snake_case (clientVersionResponse in
-  // internal/api/client_assets.go). Map to a camelCase struct for
-  // the rest of the component.
+  // internal/api/client_assets.go).
   type WireInfo = { version: string; apk_url: string; size_bytes: number };
   type Info = { version: string; apkUrl: string; sizeBytes: number };
 
@@ -40,23 +41,19 @@
 </script>
 
 {#if info}
-  <section class="space-y-3 rounded border border-border bg-surface p-4">
-    <h2 class="text-lg font-semibold">Mobile app</h2>
-    <p class="text-sm text-text-secondary">
-      Install the Android app paired to this server. Sign in with the same account.
-    </p>
-    <a
-      href={info.apkUrl}
-      download="minstrel.apk"
-      class="mobile-app-download flex items-center gap-3 rounded-md border border-border bg-surface px-3 py-2 text-sm text-text-primary no-underline transition-colors hover:bg-surface-hover hover:text-accent-fg focus-visible:ring-2 focus-visible:ring-accent"
+  <SettingsGroup title="Android app">
+    <SettingRow
+      label="Minstrel for Android"
+      hint="{info.version}{info.sizeBytes > 0 ? ` · ${formatSize(info.sizeBytes)}` : ''} · sign in with this account"
     >
-      <Smartphone size={18} strokeWidth={1.5} class="shrink-0 text-accent-fg" />
-      <span class="flex flex-col leading-tight">
-        <span class="font-medium">Get the Android app</span>
-        <span class="text-xs text-text-secondary">
-          {info.version}{info.sizeBytes > 0 ? ` · ${formatSize(info.sizeBytes)}` : ''}
-        </span>
-      </span>
-    </a>
-  </section>
+      <Smartphone size={18} strokeWidth={1.5} class="text-text-secondary" aria-hidden="true" />
+      <a
+        href={info.apkUrl}
+        download="minstrel.apk"
+        class="inline-flex items-center gap-1.5 rounded-md bg-action-secondary px-3 py-1.5 text-sm text-action-fg hover:opacity-90 focus-visible:ring-2 focus-visible:ring-accent"
+      >
+        <Download size={16} strokeWidth={1.75} aria-hidden="true" /> Download
+      </a>
+    </SettingRow>
+  </SettingsGroup>
 {/if}