feat(chrome): shared account menu and global app header

Move account actions (Settings, Downloads, Display preferences, Sign
out) out of the library-only header into a shared AccountMenu anchored in
a global AppHeader, available on every authenticated non-immersive
screen. Add a layoutShell helper deciding where chrome shows, expose
serverName/serverUrl auth stores, and a display view-mode preference. The
settings page also gains the UR-053 WiFi-only toggle.

TRACES: UR-054 | DR-075, DR-076, DR-077

src/routes/settings/+page.svelte

@@ -1,8 +1,13 @@
-<!-- TRACES: UR-023 | DR-048 -->
+<!-- TRACES: UR-023, UR-029 | DR-048, DR-077 -->
 <script lang="ts">
   import { onMount } from "svelte";
   import { commands } from "$lib/api/bindings";
-  import type { AudioSettings, VideoSettings, VolumeLevel } from "$lib/api/bindings";
+  import type {
+    AudioSettings,
+    CacheConfig,
+    VideoSettings,
+    VolumeLevel,
+  } from "$lib/api/bindings";
   import {
     getCacheStats,
     setCacheLimit,
@@ -12,6 +17,13 @@
     bytesToGb,
     type ImageCacheStats,
   } from "$lib/services/imageCache";
+  import { getCacheConfig, updateCacheConfig } from "$lib/services/preload";
+  import SearchGroupOrderList from "$lib/components/settings/SearchGroupOrderList.svelte";
+  import { library, viewMode } from "$lib/stores/library";
+  import {
+    isNetworkDetectionSupported,
+    reportNetworkState,
+  } from "$lib/services/networkType";
 
   const episodeLimitOptions = [
     { value: 0, label: "Unlimited" },
@@ -35,6 +47,21 @@
     autoPlayMaxEpisodes: 0,
   });
 
+  // Download/caching behaviour, incl. the WiFi-only gate (UR-053).
+  let cacheConfig = $state<CacheConfig>({
+    queuePrecacheEnabled: true,
+    queuePrecacheCount: 3,
+    albumAffinityEnabled: true,
+    albumAffinityThreshold: 3,
+    storageLimit: 10 * 1024 * 1024 * 1024,
+    wifiOnly: false,
+  });
+
+  // Whether the platform can actually detect the network type. On desktop it
+  // can't, so the WiFi-only toggle would be inert — we disable and explain it
+  // rather than offering a switch that does nothing.
+  let networkDetectionSupported = $state(false);
+
   let loading = $state(true);
   let saving = $state(false);
   let saveMessage = $state("");
@@ -60,12 +87,15 @@
   async function loadSettings() {
     try {
       loading = true;
-      const [audioResult, videoResult] = await Promise.all([
+      networkDetectionSupported = isNetworkDetectionSupported();
+      const [audioResult, videoResult, cacheResult] = await Promise.all([
         commands.playerGetAudioSettings(),
         commands.playerGetVideoSettings(),
+        getCacheConfig(),
       ]);
       settings = audioResult;
       videoSettings = videoResult;
+      cacheConfig = cacheResult;
       // Load cache stats in parallel but don't block on it
       loadCacheStats();
     } catch (e) {
@@ -130,7 +160,12 @@
       await Promise.all([
         commands.playerSetAudioSettings(settings),
         commands.playerSetVideoSettings(videoSettings),
+        updateCacheConfig(cacheConfig),
       ]);
+      // Re-report the network so the backend re-evaluates the gate against the
+      // just-saved wifi-only preference, releasing or holding the queue now
+      // rather than at the next network change.
+      await reportNetworkState();
       saveMessage = "Settings saved successfully!";
       setTimeout(() => {
         saveMessage = "";
@@ -172,8 +207,8 @@
 
 <div class="max-w-2xl mx-auto space-y-8 p-6">
   <div>
-    <h1 class="text-3xl font-bold text-white mb-2">Audio Settings</h1>
-    <p class="text-gray-400">Configure playback and audio processing</p>
+    <h1 class="text-3xl font-bold text-white mb-2">Settings</h1>
+    <p class="text-gray-400">Configure display, playback, and downloads</p>
   </div>
 
   {#if loading}
@@ -182,6 +217,47 @@
     </div>
   {:else}
     <div class="space-y-6">
+      <!-- Display — grid/list preference, a second view onto the library
+           viewMode store (same source of truth as the library page-header
+           toggle, so the two stay in sync for free). -->
+      <div id="display" class="scroll-mt-4 bg-[var(--color-surface)] rounded-lg p-6">
+        <div class="mb-4">
+          <h2 class="text-xl font-semibold text-white">Display</h2>
+          <p class="text-sm text-gray-400 mt-1">
+            How your library and collections are laid out
+          </p>
+        </div>
+        <p class="text-sm font-medium text-gray-300 mb-3">Layout</p>
+        <div class="grid grid-cols-2 gap-3">
+          <button
+            onclick={() => library.setViewMode("grid")}
+            class="flex items-center justify-center gap-2 py-3 px-4 rounded-lg transition-all {$viewMode ===
+            'grid'
+              ? 'bg-[var(--color-jellyfin)] text-white'
+              : 'bg-gray-700 text-gray-300 hover:bg-gray-600'}"
+            aria-pressed={$viewMode === "grid"}
+          >
+            <svg class="w-5 h-5" fill="currentColor" viewBox="0 0 24 24">
+              <path d="M4 4h7v7H4V4zm9 0h7v7h-7V4zM4 13h7v7H4v-7zm9 0h7v7h-7v-7z" />
+            </svg>
+            <span class="font-semibold">Grid</span>
+          </button>
+          <button
+            onclick={() => library.setViewMode("list")}
+            class="flex items-center justify-center gap-2 py-3 px-4 rounded-lg transition-all {$viewMode ===
+            'list'
+              ? 'bg-[var(--color-jellyfin)] text-white'
+              : 'bg-gray-700 text-gray-300 hover:bg-gray-600'}"
+            aria-pressed={$viewMode === "list"}
+          >
+            <svg class="w-5 h-5" fill="currentColor" viewBox="0 0 24 24">
+              <path d="M3 5h18v2H3V5zm0 6h18v2H3v-2zm0 6h18v2H3v-2z" />
+            </svg>
+            <span class="font-semibold">List</span>
+          </button>
+        </div>
+      </div>
+
       <!-- Crossfade -->
       <div class="bg-[var(--color-surface)] rounded-lg p-6">
         <div class="flex items-start justify-between mb-4">
@@ -384,6 +460,20 @@
         </div>
       </div>
 
+      <!-- Search Settings -->
+      <div class="border-t border-gray-700 pt-6">
+        <h2 class="text-2xl font-bold text-white mb-4">Search</h2>
+
+        <div class="bg-[var(--color-surface)] rounded-lg p-6">
+          <h3 class="text-lg font-semibold text-white mb-1">Result Group Order</h3>
+          <p class="text-sm text-gray-400 mb-4">
+            Drag or use the arrows to choose the order search result groups appear in.
+            Empty groups are hidden automatically.
+          </p>
+          <SearchGroupOrderList />
+        </div>
+      </div>
+
       <!-- Image Cache Settings -->
       <div class="border-t border-gray-700 pt-6">
         <h2 class="text-2xl font-bold text-white mb-4">Image Cache</h2>
@@ -507,12 +597,19 @@
               </p>
             </div>
             <button
-              class="relative inline-flex h-8 w-14 items-center rounded-full transition-colors bg-[var(--color-jellyfin)]"
-              aria-label="Toggle album affinity (coming soon)"
-              disabled
+              onclick={() =>
+                (cacheConfig.albumAffinityEnabled =
+                  !cacheConfig.albumAffinityEnabled)}
+              class="relative inline-flex h-8 w-14 items-center rounded-full transition-colors {cacheConfig.albumAffinityEnabled
+                ? 'bg-[var(--color-jellyfin)]'
+                : 'bg-gray-600'}"
+              aria-label="Toggle smart caching"
+              aria-pressed={cacheConfig.albumAffinityEnabled}
             >
               <span
-                class="inline-block h-6 w-6 transform rounded-full bg-white transition-transform translate-x-7"
+                class="inline-block h-6 w-6 transform rounded-full bg-white transition-transform {cacheConfig.albumAffinityEnabled
+                  ? 'translate-x-7'
+                  : 'translate-x-1'}"
               ></span>
             </button>
           </div>
@@ -524,16 +621,24 @@
             <div>
               <h3 class="text-xl font-semibold text-white">Queue Pre-caching</h3>
               <p class="text-sm text-gray-400 mt-1">
-                Download next 5 tracks in queue automatically
+                Download the next {cacheConfig.queuePrecacheCount} tracks in the queue
+                automatically
               </p>
             </div>
             <button
-              class="relative inline-flex h-8 w-14 items-center rounded-full transition-colors bg-[var(--color-jellyfin)]"
-              aria-label="Toggle queue pre-caching (coming soon)"
-              disabled
+              onclick={() =>
+                (cacheConfig.queuePrecacheEnabled =
+                  !cacheConfig.queuePrecacheEnabled)}
+              class="relative inline-flex h-8 w-14 items-center rounded-full transition-colors {cacheConfig.queuePrecacheEnabled
+                ? 'bg-[var(--color-jellyfin)]'
+                : 'bg-gray-600'}"
+              aria-label="Toggle queue pre-caching"
+              aria-pressed={cacheConfig.queuePrecacheEnabled}
             >
               <span
-                class="inline-block h-6 w-6 transform rounded-full bg-white transition-transform translate-x-7"
+                class="inline-block h-6 w-6 transform rounded-full bg-white transition-transform {cacheConfig.queuePrecacheEnabled
+                  ? 'translate-x-7'
+                  : 'translate-x-1'}"
               ></span>
             </button>
           </div>
@@ -545,16 +650,30 @@
             <div>
               <h3 class="text-xl font-semibold text-white">WiFi Only</h3>
               <p class="text-sm text-gray-400 mt-1">
-                Only download when connected to WiFi
+                {#if networkDetectionSupported}
+                  Hold downloads unless on an unmetered network. Cellular and
+                  metered hotspots are excluded; WiFi and Ethernet are allowed.
+                {:else}
+                  Only available on Android — this device has no metered
+                  connection to detect.
+                {/if}
               </p>
             </div>
             <button
-              class="relative inline-flex h-8 w-14 items-center rounded-full transition-colors bg-[var(--color-jellyfin)]"
-              aria-label="Toggle WiFi only downloads (coming soon)"
-              disabled
+              onclick={() => (cacheConfig.wifiOnly = !cacheConfig.wifiOnly)}
+              class="relative inline-flex h-8 w-14 items-center rounded-full transition-colors {cacheConfig.wifiOnly
+                ? 'bg-[var(--color-jellyfin)]'
+                : 'bg-gray-600'} {networkDetectionSupported
+                ? ''
+                : 'opacity-50 cursor-not-allowed'}"
+              aria-label="Toggle WiFi only downloads"
+              aria-pressed={cacheConfig.wifiOnly}
+              disabled={!networkDetectionSupported}
             >
               <span
-                class="inline-block h-6 w-6 transform rounded-full bg-white transition-transform translate-x-7"
+                class="inline-block h-6 w-6 transform rounded-full bg-white transition-transform {cacheConfig.wifiOnly
+                  ? 'translate-x-7'
+                  : 'translate-x-1'}"
               ></span>
             </button>
           </div>