Add connection overlay and Gitea CI/CD workflow

Show full-screen overlay with spinner when server is unreachable,
with periodic health checks that auto-hide on reconnect.
Add Gitea Actions workflow for auto-deploy on release tags.

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

server/src/wled_controller/static/css/layout.css

@@ -105,6 +105,48 @@ h2 {
     50% { opacity: 0.5; }
 }
 
+/* Connection lost overlay */
+.connection-overlay {
+    position: fixed;
+    inset: 0;
+    z-index: 10000;
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    background: rgba(0, 0, 0, 0.7);
+    backdrop-filter: blur(4px);
+}
+
+.connection-overlay-content {
+    text-align: center;
+    color: #fff;
+}
+
+.connection-overlay-content h2 {
+    margin: 16px 0 8px;
+    font-size: 1.4rem;
+}
+
+.connection-overlay-content p {
+    margin: 0;
+    opacity: 0.7;
+    font-size: 0.95rem;
+}
+
+.connection-spinner-lg {
+    width: 40px;
+    height: 40px;
+    margin: 0 auto;
+    border: 3px solid rgba(255, 255, 255, 0.25);
+    border-top-color: #fff;
+    border-radius: 50%;
+    animation: conn-spin 0.8s linear infinite;
+}
+
+@keyframes conn-spin {
+    to { transform: rotate(360deg); }
+}
+
 /* WLED device health indicator */
 .health-dot {
     display: inline-block;

server/src/wled_controller/static/js/app.js

@@ -7,7 +7,7 @@ import { apiKey, setApiKey, refreshInterval } from './core/state.js';
 import { Modal } from './core/modal.js';
 
 // Layer 1: api, i18n
-import { loadServerInfo, loadDisplays, configureApiKey } from './core/api.js';
+import { loadServerInfo, loadDisplays, configureApiKey, startConnectionMonitor, stopConnectionMonitor } from './core/api.js';
 import { t, initLocale, changeLocale } from './core/i18n.js';
 
 // Layer 2: ui
@@ -506,6 +506,7 @@ window.addEventListener('beforeunload', () => {
     if (refreshInterval) {
         clearInterval(refreshInterval);
     }
+    stopConnectionMonitor();
     stopEventsWS();
     disconnectAllKCWebSockets();
     disconnectAllLedPreviewWS();
@@ -552,6 +553,10 @@ document.addEventListener('DOMContentLoaded', async () => {
     // Setup form handler
     document.getElementById('add-device-form').addEventListener('submit', handleAddDevice);
 
+    // Always monitor server connection (even before login)
+    loadServerInfo();
+    startConnectionMonitor();
+
     // Show modal if no API key is stored
     if (!apiKey) {
         setTimeout(() => {
@@ -563,7 +568,6 @@ document.addEventListener('DOMContentLoaded', async () => {
     }
 
     // User is logged in, load data
-    loadServerInfo();
     loadDisplays();
     loadTargetsTab();
 

server/src/wled_controller/static/js/core/api.js

@@ -120,17 +120,56 @@ export function handle401Error() {
     }
 }
 
+let _connCheckTimer = null;
+let _serverOnline = null;  // null = unknown, true/false
+
+function _setConnectionState(online) {
+    const changed = _serverOnline !== online;
+    _serverOnline = online;
+    const banner = document.getElementById('connection-overlay');
+    const badge = document.getElementById('server-status');
+    if (online) {
+        if (banner) banner.style.display = 'none';
+        if (badge) badge.className = 'status-badge online';
+    } else {
+        if (banner) banner.style.display = 'flex';
+        if (badge) badge.className = 'status-badge offline';
+    }
+    return changed;
+}
+
 export async function loadServerInfo() {
     try {
-        const response = await fetch('/health');
+        const response = await fetch('/health', { signal: AbortSignal.timeout(5000) });
         const data = await response.json();
 
         document.getElementById('version-number').textContent = `v${data.version}`;
         document.getElementById('server-status').textContent = '●';
-        document.getElementById('server-status').className = 'status-badge online';
+        const wasOffline = _serverOnline === false;
+        _setConnectionState(true);
+        if (wasOffline) {
+            // Server came back — reload data
+            window.dispatchEvent(new CustomEvent('server:reconnected'));
+        }
     } catch (error) {
         console.error('Failed to load server info:', error);
-        document.getElementById('server-status').className = 'status-badge offline';
+        _setConnectionState(false);
+    }
+}
+
+/**
+ * Start periodic health checks. Shows/hides the connection banner.
+ * @param {number} interval - Check interval in ms (default 10s)
+ */
+export function startConnectionMonitor(interval = 10000) {
+    stopConnectionMonitor();
+    _connCheckTimer = setInterval(loadServerInfo, interval);
+}
+
+export function stopConnectionMonitor() {
+    if (_connCheckTimer) {
+        clearInterval(_connCheckTimer);
+        _connCheckTimer = null;
     }
 }
 

server/src/wled_controller/static/locales/en.json

@@ -2,6 +2,8 @@
   "app.title": "LED Grab",
   "app.version": "Version:",
   "app.api_docs": "API Documentation",
+  "app.connection_lost": "Server unreachable",
+  "app.connection_retrying": "Attempting to reconnect…",
   "theme.toggle": "Toggle theme",
   "accent.title": "Accent color",
   "accent.custom": "Custom",

server/src/wled_controller/static/locales/ru.json

@@ -2,6 +2,8 @@
   "app.title": "LED Grab",
   "app.version": "Версия:",
   "app.api_docs": "Документация API",
+  "app.connection_lost": "Сервер недоступен",
+  "app.connection_retrying": "Попытка переподключения…",
   "theme.toggle": "Переключить тему",
   "accent.title": "Цвет акцента",
   "accent.custom": "Свой",

server/src/wled_controller/static/locales/zh.json

@@ -2,6 +2,8 @@
   "app.title": "LED Grab",
   "app.version": "版本：",
   "app.api_docs": "API 文档",
+  "app.connection_lost": "服务器不可达",
+  "app.connection_retrying": "正在尝试重新连接…",
   "theme.toggle": "切换主题",
   "accent.title": "主题色",
   "accent.custom": "自定义",