Add PWA support: installable standalone app with safe area handling

- Service worker, manifest, and SVG icon for PWA installability
- Root /sw.js route for full-scope service worker registration
- Meta tags: theme-color, apple-mobile-web-app, viewport-fit=cover
- Safe area insets for notched phones (container, mini-player, footer, banner)
- Dynamic theme-color sync on light/dark toggle
- Overscroll prevention and touch-action optimization
- Hide mini-player prev/next buttons on small screens
- Updated README with PWA and new feature documentation

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

README.md

@@ -5,7 +5,10 @@ A REST API server for controlling system media playback on Windows, Linux, macOS
 ## Features
 
 - **Built-in Web UI** for real-time media control and monitoring
+- **Installable PWA** - Add to home screen on mobile for a native app experience
+- **Audio Visualizer** - Real-time spectrum analyzer with beat-reactive album art effects
 - **Media Browser** - Browse and play media files from configured folders
+- **Display Control** - Monitor brightness and power management
 - **Quick Actions & Scripts** - Execute custom scripts with one click
 - **Callbacks** - Trigger commands on media events (play, pause, volume, etc.)
 - Control any media player via system-wide media transport controls
@@ -36,10 +39,13 @@ The media server includes a built-in web interface for controlling and monitorin
 - **Mini player** - Sticky compact player that appears when scrolling away from the main player
 - **Connection status indicator** - Know when you're connected
 - **Token authentication** - Saved in browser localStorage
-- **Responsive design** - Works on desktop and mobile
+- **Audio spectrum visualizer** - Real-time frequency bars with beat-reactive album art scaling and glow (on-demand WASAPI loopback capture)
-- **Dark and light themes** - Toggle between dark and light modes
+- **Display control** - Monitor brightness adjustment and power on/off
-- **Accent color picker** - Choose from 9 preset accent colors (green, blue, purple, pink, orange, red, teal, cyan, yellow)
+- **Installable PWA** - Add to home screen on mobile/desktop for standalone app experience with safe area support for notched phones
-- **Tab-based navigation** - Player, Browser, Quick Actions, Scripts, and Callbacks tabs
+- **Responsive design** - Works on desktop, tablet, and mobile
+- **Dark and light themes** - Toggle between dark and light modes with dynamic status bar theming
+- **Accent color picker** - Choose from 9 preset accent colors or pick a custom color
+- **Tab-based navigation** - Player, Display, Browser, Quick Actions, and Settings tabs
 - **Multi-language support** - English and Russian locales with automatic detection
 
 ### Accessing the Web UI
@@ -58,6 +64,29 @@ The media server includes a built-in web interface for controlling and monitorin
 
 4. Start playing media in any supported player and watch the UI update in real-time!
 
+### Installing as a PWA
+
+The Web UI can be installed as a Progressive Web App for a native app-like experience:
+
+1. Open the Web UI in Chrome/Edge on your phone or desktop
+2. Tap the **Install** icon in the address bar (or "Add to Home Screen" on mobile)
+3. The app launches in standalone mode — no browser chrome, with proper safe area handling for notched phones
+
+### Audio Visualizer
+
+The Web UI includes a real-time audio spectrum visualizer that captures system audio output:
+
+- **On-demand capture** - Audio capture starts only when a client enables the visualizer, and stops when the last client disconnects
+- **Beat-reactive effects** - Album art pulses and glows in response to bass frequencies
+- **Configurable device** - Select which audio output device to capture in Settings
+
+Requires `soundcard` and `numpy` Python packages. Enable in `config.yaml`:
+
+```yaml
+visualizer_enabled: true
+# visualizer_device: "Speakers"  # optional: specific device name
+```
+
 ### Remote Access
 
 To access the Web UI from other devices on your network:

media_server/main.py

@@ -154,6 +154,15 @@ def create_app() -> FastAPI:
     # Mount static files and serve UI at root
     static_dir = Path(__file__).parent / "static"
     if static_dir.exists():
+        @app.get("/sw.js", include_in_schema=False)
+        async def serve_service_worker():
+            """Serve service worker from root scope for PWA installability."""
+            return FileResponse(
+                static_dir / "sw.js",
+                media_type="application/javascript",
+                headers={"Cache-Control": "no-cache"},
+            )
+
         app.mount("/static", StaticFiles(directory=str(static_dir)), name="static")
 
         @app.get("/", include_in_schema=False)

media_server/static/css/styles.css

@@ -3067,6 +3067,10 @@ footer .separator {
         padding-top: calc(0.5rem + 2px);
     }
 
+    .mini-nav-btn {
+        display: none;
+    }
+
     .mini-player-info {
         min-width: 120px;
     }
@@ -3164,3 +3168,72 @@ footer .separator {
         justify-content: flex-start;
     }
 }
+
+/* ========================================
+   PWA Standalone & Mobile Polish
+   ======================================== */
+
+html {
+    overscroll-behavior: none;
+}
+
+/* Safe area insets for notched phones (viewport-fit=cover) */
+.container {
+    padding-left: max(0.75rem, env(safe-area-inset-left));
+    padding-right: max(0.75rem, env(safe-area-inset-right));
+}
+
+.mini-player {
+    padding-bottom: max(0.75rem, env(safe-area-inset-bottom));
+    padding-left: max(1rem, env(safe-area-inset-left));
+    padding-right: max(1rem, env(safe-area-inset-right));
+}
+
+footer {
+    padding-bottom: max(0.75rem, env(safe-area-inset-bottom));
+}
+
+body.mini-player-visible footer {
+    padding-bottom: calc(70px + env(safe-area-inset-bottom, 0px));
+}
+
+.connection-banner {
+    padding-top: max(10px, env(safe-area-inset-top));
+}
+
+/* Touch optimization: eliminate 300ms tap delay */
+.controls button,
+.mini-controls button,
+.mini-control-btn,
+.tab-btn,
+.header-btn,
+.header-link,
+.mute-btn,
+.vinyl-toggle-btn,
+.view-toggle-btn,
+.browser-item,
+.browser-list-item,
+.script-btn,
+.action-btn {
+    touch-action: manipulation;
+}
+
+@media (max-width: 600px) {
+    .container {
+        padding-left: max(0.5rem, env(safe-area-inset-left));
+        padding-right: max(0.5rem, env(safe-area-inset-right));
+    }
+
+    .mini-player {
+        padding-bottom: max(0.5rem, env(safe-area-inset-bottom));
+        padding-left: max(0.75rem, env(safe-area-inset-left));
+        padding-right: max(0.75rem, env(safe-area-inset-right));
+    }
+}
+
+@media (display-mode: standalone) {
+    body {
+        overscroll-behavior-y: none;
+        -webkit-overflow-scrolling: touch;
+    }
+}

media_server/static/icons/icon.svg

@@ -0,0 +1,10 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100">
+  <defs>
+    <linearGradient id="grad" x1="0%" y1="0%" x2="100%" y2="100%">
+      <stop offset="0%" style="stop-color:#1db954;stop-opacity:1" />
+      <stop offset="100%" style="stop-color:#1ed760;stop-opacity:1" />
+    </linearGradient>
+  </defs>
+  <circle cx="50" cy="50" r="45" fill="url(#grad)"/>
+  <path fill="white" d="M35 25 L35 75 L75 50 Z"/>
+</svg>

media_server/static/index.html

@@ -2,9 +2,16 @@
 <html lang="en">
 <head>
     <meta charset="UTF-8">
-    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0, viewport-fit=cover">
     <title>Media Server</title>
-    <link rel="icon" type="image/svg+xml" href="data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 100 100'%3E%3Cdefs%3E%3ClinearGradient id='grad' x1='0%25' y1='0%25' x2='100%25' y2='100%25'%3E%3Cstop offset='0%25' style='stop-color:%231db954;stop-opacity:1' /%3E%3Cstop offset='100%25' style='stop-color:%231ed760;stop-opacity:1' /%3E%3C/linearGradient%3E%3C/defs%3E%3Ccircle cx='50' cy='50' r='45' fill='url(%23grad)'/%3E%3Cpath fill='white' d='M35 25 L35 75 L75 50 Z'/%3E%3C/svg%3E">
+    <meta name="description" content="Remote media player control and file browser">
+    <meta name="theme-color" content="#121212">
+    <meta name="apple-mobile-web-app-capable" content="yes">
+    <meta name="apple-mobile-web-app-status-bar-style" content="black-translucent">
+    <meta name="apple-mobile-web-app-title" content="Media Server">
+    <link rel="manifest" href="/static/manifest.json">
+    <link rel="icon" type="image/svg+xml" href="/static/icons/icon.svg">
+    <link rel="apple-touch-icon" href="/static/icons/icon.svg">
     <link rel="stylesheet" href="/static/css/styles.css">
 </head>
 <body class="loading-translations">

media_server/static/js/main.js

@@ -10,6 +10,11 @@ window.addEventListener('DOMContentLoaded', async () => {
     initTheme();
     initAccentColor();
 
+    // Register service worker for PWA installability
+    if ('serviceWorker' in navigator) {
+        navigator.serviceWorker.register('/sw.js').catch(() => {});
+    }
+
     // Initialize vinyl mode
     applyVinylMode();
 

media_server/static/js/player.js

@@ -94,6 +94,11 @@ function setTheme(theme) {
         sunIcon.style.display = 'block';
         moonIcon.style.display = 'none';
     }
+
+    const metaThemeColor = document.querySelector('meta[name="theme-color"]');
+    if (metaThemeColor) {
+        metaThemeColor.setAttribute('content', theme === 'light' ? '#ffffff' : '#121212');
+    }
 }
 
 function toggleTheme() {

media_server/static/manifest.json

@@ -0,0 +1,23 @@
+{
+  "name": "Media Server",
+  "short_name": "Media",
+  "description": "Remote media player control and file browser",
+  "start_url": "/",
+  "display": "standalone",
+  "orientation": "any",
+  "background_color": "#121212",
+  "theme_color": "#121212",
+  "icons": [
+    {
+      "src": "/static/icons/icon.svg",
+      "sizes": "any",
+      "type": "image/svg+xml"
+    },
+    {
+      "src": "/static/icons/icon.svg",
+      "sizes": "any",
+      "type": "image/svg+xml",
+      "purpose": "maskable"
+    }
+  ]
+}

media_server/static/sw.js

@@ -0,0 +1,15 @@
+// Minimal service worker for PWA installability.
+// This app requires a live WebSocket connection, so offline caching is not useful.
+// All fetch requests are passed through to the network.
+
+self.addEventListener('install', () => {
+    self.skipWaiting();
+});
+
+self.addEventListener('activate', (event) => {
+    event.waitUntil(self.clients.claim());
+});
+
+self.addEventListener('fetch', (event) => {
+    event.respondWith(fetch(event.request));
+});