feat(web): restart-pending banner, unsaved-changes guard, installable web app

Three usability improvements from live testing feedback:

- Restart-pending banner: every successful POST to /api/v3/config/main
  (display hardware, rotation/durations, general settings) now raises a
  persistent banner - "Configuration saved, restart the display to apply" -
  with a Restart Now button that posts restart_display_service directly.
  Backed by sessionStorage so it survives tab switches and reloads until
  restarted or dismissed. Plugin config saves are deliberately excluded:
  they apply live via the display process's config watcher.
- Unsaved-changes guard: plugin config panels are Alpine x-if templates,
  so navigating away destroys the panel and revisiting re-fetches it -
  edits were silently discarded. Forms now mark themselves dirty on input
  (cleared on successful submit), a capture-phase click handler confirms
  before a lossy tab switch, and beforeunload guards full page unloads.
  System tabs (x-show, persistent DOM) are exempt - no false prompts.
- Installable web app: manifest.json (standalone display, dark theme) +
  generated LED-grid icons (192/512 maskable + 180 apple-touch), linked
  from base.html. "Add to Home Screen" now yields an app-like fullscreen
  experience; no service worker, so zero behavioral risk.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01KEZK1P1Q1fu5pcuVrkrCFZ

web_interface/static/v3/app.js

@@ -49,6 +49,111 @@ document.body.addEventListener('htmx:afterRequest', function(event) {
             // Not JSON, ignore
         }
     }
+
+    // Main-config saves (display hardware, rotation/durations, general) only
+    // take effect after a display-service restart — surface the reminder
+    // banner. Plugin config saves apply live and are deliberately excluded.
+    try {
+        const cfg = event.detail.requestConfig;
+        if (cfg && cfg.verb === 'post' &&
+            (cfg.path || '').includes('/api/v3/config/main') &&
+            response && response.status >= 200 && response.status < 300) {
+            window.showRestartPending();
+        }
+    } catch { /* banner is best-effort */ }
+});
+
+// ===== Unsaved-changes guard =====
+// Plugin config panels are Alpine x-if templates: navigating away DESTROYS
+// the panel and revisiting re-fetches it, silently discarding any edits.
+// (System tabs use x-show + data-loaded and persist, so they're exempt.)
+// Track dirty forms and confirm before a lossy navigation.
+(function() {
+    function markDirty(e) {
+        const form = e.target && e.target.closest ? e.target.closest('form') : null;
+        if (form) form.setAttribute('data-dirty', '');
+    }
+    document.body.addEventListener('input', markDirty);
+    document.body.addEventListener('change', markDirty);
+
+    // A successful submit makes the form clean again
+    document.body.addEventListener('htmx:afterRequest', function(event) {
+        const xhr = event.detail.xhr;
+        const form = event.detail.elt && event.detail.elt.closest ? event.detail.elt.closest('form') : null;
+        if (form && xhr && xhr.status >= 200 && xhr.status < 300) {
+            form.removeAttribute('data-dirty');
+        }
+    });
+
+    // Capture phase so this runs before Alpine's bubbling @click switches tabs
+    document.addEventListener('click', function(e) {
+        const tabBtn = e.target && e.target.closest ? e.target.closest('.nav-tab') : null;
+        if (!tabBtn) return;
+        const lossy = Array.prototype.filter.call(
+            document.querySelectorAll('.plugin-config-tab form[data-dirty]'),
+            function(f) { return f.offsetParent !== null; }
+        );
+        if (lossy.length === 0) return;
+        if (!window.confirm('You have unsaved plugin settings — leaving this page will discard them. Leave anyway?')) {
+            e.stopPropagation();
+            e.preventDefault();
+        }
+    }, true);
+
+    // Full page unload loses every panel's edits
+    window.addEventListener('beforeunload', function(e) {
+        const dirty = Array.prototype.some.call(
+            document.querySelectorAll('form[data-dirty]'),
+            function(f) { return f.offsetParent !== null; }
+        );
+        if (dirty) {
+            e.preventDefault();
+            e.returnValue = '';
+        }
+    });
+})();
+
+// ===== Restart-pending banner =====
+// Shown after restart-requiring saves; persists across tab switches (and
+// reloads, via sessionStorage) until the display restarts or it's dismissed.
+window.showRestartPending = function() {
+    try { sessionStorage.setItem('ledmatrix-restart-pending', '1'); } catch { /* private browsing */ }
+    const banner = document.getElementById('restart-pending-banner');
+    if (banner) banner.style.display = 'block';
+};
+
+window.dismissRestartPending = function() {
+    try { sessionStorage.removeItem('ledmatrix-restart-pending'); } catch { /* no-op */ }
+    const banner = document.getElementById('restart-pending-banner');
+    if (banner) banner.style.display = 'none';
+};
+
+window.restartPendingNow = function() {
+    const btn = document.getElementById('restart-pending-btn');
+    if (btn) btn.disabled = true;
+    fetch('/api/v3/system/action', {
+        method: 'POST',
+        headers: { 'Content-Type': 'application/json' },
+        body: JSON.stringify({ action: 'restart_display_service' })
+    })
+    .then(r => r.json())
+    .then(data => {
+        showNotification(data.message || 'Display restarting…', data.status || 'success');
+        window.dismissRestartPending();
+    })
+    .catch(err => {
+        showNotification('Error restarting display: ' + err.message, 'error');
+    })
+    .finally(() => { if (btn) btn.disabled = false; });
+};
+
+document.addEventListener('DOMContentLoaded', function() {
+    try {
+        if (sessionStorage.getItem('ledmatrix-restart-pending') === '1') {
+            const banner = document.getElementById('restart-pending-banner');
+            if (banner) banner.style.display = 'block';
+        }
+    } catch { /* no-op */ }
 });
 
 // SSE reconnection helper — closes and reopens both SSE streams,

web_interface/static/v3/manifest.json

@@ -0,0 +1,24 @@
+{
+    "name": "LED Matrix Control",
+    "short_name": "LEDMatrix",
+    "description": "Control panel for the LEDMatrix display",
+    "start_url": "/",
+    "scope": "/",
+    "display": "standalone",
+    "background_color": "#111827",
+    "theme_color": "#111827",
+    "icons": [
+        {
+            "src": "/static/v3/icons/icon-192.png",
+            "sizes": "192x192",
+            "type": "image/png",
+            "purpose": "any maskable"
+        },
+        {
+            "src": "/static/v3/icons/icon-512.png",
+            "sizes": "512x512",
+            "type": "image/png",
+            "purpose": "any maskable"
+        }
+    ]
+}

web_interface/templates/v3/base.html

@@ -5,6 +5,12 @@
     <meta name="viewport" content="width=device-width, initial-scale=1.0">
     <title>LED Matrix Control Panel</title>
 
+    <!-- Installable web app (Add to Home Screen) -->
+    <link rel="manifest" href="{{ url_for('static', filename='v3/manifest.json') }}">
+    <meta name="theme-color" content="#111827">
+    <link rel="apple-touch-icon" href="{{ url_for('static', filename='v3/icons/apple-touch-icon.png') }}">
+    <link rel="icon" type="image/png" sizes="192x192" href="{{ url_for('static', filename='v3/icons/icon-192.png') }}">
+
     <!-- Debug logging gate: verbose console output is suppressed unless
          localStorage.pluginDebug === 'true' (the same switch the plugin
          scripts already use). console.error/warn are never gated. -->
@@ -396,6 +402,36 @@
         </div>
     </div>
 
+    <!-- Restart-pending banner: shown after a main-config save (display
+         hardware, rotation order, durations, general settings) — those only
+         take effect after the display service restarts. Plugin config saves
+         apply live and don't trigger this. Wired in app.js. -->
+    <div id="restart-pending-banner" style="display:none"
+         class="update-banner border-b transition-all duration-300 ease-in-out">
+        <div class="mx-auto px-4 sm:px-6 lg:px-8 xl:px-12 2xl:px-16 py-2" style="max-width:100%">
+            <div class="flex items-center justify-between">
+                <div class="flex items-center space-x-3">
+                    <i class="fas fa-rotate text-lg"></i>
+                    <span class="text-sm font-medium" aria-live="polite">
+                        Configuration saved &mdash; restart the display to apply the changes
+                    </span>
+                </div>
+                <div class="flex items-center space-x-3">
+                    <button onclick="window.restartPendingNow()" id="restart-pending-btn"
+                            class="inline-flex items-center px-3 py-1 text-xs font-semibold rounded-md
+                                   update-banner-action transition-colors duration-150">
+                        <i class="fas fa-power-off mr-1"></i> Restart Now
+                    </button>
+                    <button type="button" onclick="window.dismissRestartPending()"
+                            class="update-banner-dismiss rounded p-1 transition-colors duration-150"
+                            title="Dismiss" aria-label="Dismiss restart reminder">
+                        <i class="fas fa-times text-sm"></i>
+                    </button>
+                </div>
+            </div>
+        </div>
+    </div>
+
     <!-- Under-voltage / throttling warning banner -->
     <div id="power-warning-banner" style="display:none"
          class="power-warning-banner border-b transition-all duration-300 ease-in-out">