feat: Implement Electron window state persistence, update checking with splash screen and banner, and external link metadata fetching.

Frontend/Electron/main.cjs

@@ -346,6 +346,44 @@ app.whenReady().then(async () => {
         }
     });
 
+    // Flatpak update check
+    ipcMain.handle('check-flatpak-update', async () => {
+        const isFlatpak = fs.existsSync('/.flatpak-info') || !!process.env.FLATPAK_ID;
+        if (!isFlatpak) return { isFlatpak: false };
+
+        try {
+            const yaml = await httpGet('https://gitea.moyettes.com/Moyettes/DiscordClone/releases/download/latest/latest-linux.yml');
+            if (!yaml) return { isFlatpak: true, updateAvailable: false };
+
+            const versionMatch = yaml.match(/^version:\s*(.+)$/m);
+            if (!versionMatch) return { isFlatpak: true, updateAvailable: false };
+
+            const latestVersion = versionMatch[1].trim();
+            const currentVersion = app.getVersion();
+
+            // Semver comparison: determine if update exists and its severity
+            const latest = latestVersion.split('.').map(Number);
+            const current = currentVersion.split('.').map(Number);
+            let updateAvailable = false;
+            let updateType = 'patch'; // 'major', 'minor', or 'patch'
+            for (let i = 0; i < Math.max(latest.length, current.length); i++) {
+                const l = latest[i] || 0;
+                const c = current[i] || 0;
+                if (l > c) {
+                    updateAvailable = true;
+                    updateType = i === 0 ? 'major' : i === 1 ? 'minor' : 'patch';
+                    break;
+                }
+                if (l < c) break;
+            }
+
+            return { isFlatpak: true, updateAvailable, updateType, latestVersion, currentVersion };
+        } catch (err) {
+            console.error('Flatpak update check error:', err.message);
+            return { isFlatpak: true, updateAvailable: false };
+        }
+    });
+
     ipcMain.handle('open-external', async (event, url) => {
         await shell.openExternal(url);
     });

Frontend/Electron/preload.cjs

@@ -32,6 +32,10 @@ contextBridge.exposeInMainWorld('appSettings', {
     set: (key, value) => ipcRenderer.invoke('set-setting', key, value),
 });
 
+contextBridge.exposeInMainWorld('updateAPI', {
+    checkFlatpakUpdate: () => ipcRenderer.invoke('check-flatpak-update'),
+});
+
 contextBridge.exposeInMainWorld('sessionPersistence', {
     save: (data) => ipcRenderer.invoke('save-session', data),
     load: () => ipcRenderer.invoke('load-session'),

Frontend/Electron/src/components/TitleBar.jsx

@@ -1,4 +1,5 @@
 import React from 'react';
+import { TitleBarUpdateIcon } from './UpdateBanner';
 
 const TitleBar = () => {
     return (
@@ -26,6 +27,7 @@ const TitleBar = () => {
             </div>
             <div className="titlebar-title">Discord Clone</div>
             <div className="titlebar-buttons">
+                <TitleBarUpdateIcon />
                 <button
                     className="titlebar-btn titlebar-minimize"
                     onClick={() => window.windowControls?.minimize()}

Frontend/Electron/src/components/UpdateBanner.jsx

@@ -0,0 +1,95 @@
+import React, { useState, useEffect, createContext, useContext } from 'react';
+import updateIcon from '../assets/icons/update.svg';
+
+const RELEASE_URL = 'https://gitea.moyettes.com/Moyettes/DiscordClone/releases/tag/latest';
+
+const UpdateContext = createContext(null);
+
+export function useUpdateCheck() {
+    return useContext(UpdateContext);
+}
+
+export function UpdateProvider({ children }) {
+    const [state, setState] = useState(null);
+
+    useEffect(() => {
+        if (!window.updateAPI) return;
+
+        window.updateAPI.checkFlatpakUpdate().then((result) => {
+            if (!result?.updateAvailable) return;
+            setState(result);
+        }).catch(() => {});
+    }, []);
+
+    return (
+        <UpdateContext.Provider value={state}>
+            {children}
+            {state && (state.updateType === 'major' || state.updateType === 'minor') && (
+                <ForcedUpdateModal latestVersion={state.latestVersion} />
+            )}
+        </UpdateContext.Provider>
+    );
+}
+
+function ForcedUpdateModal({ latestVersion }) {
+    const handleDownload = () => {
+        window.cryptoAPI?.openExternal(RELEASE_URL);
+    };
+
+    return (
+        <div className="forced-update-overlay">
+            <div className="forced-update-modal">
+                <h2>Update Required</h2>
+                <p>
+                    A new version (v{latestVersion}) is available. This update is required to continue using the app.
+                </p>
+                <button className="forced-update-btn" onClick={handleDownload}>
+                    Download Update
+                </button>
+            </div>
+        </div>
+    );
+}
+
+export function TitleBarUpdateIcon() {
+    const update = useUpdateCheck();
+
+    if (!update) return null;
+
+    const handleClick = () => {
+        window.cryptoAPI?.openExternal(RELEASE_URL);
+    };
+
+    return (
+        <button
+            className="titlebar-btn"
+            onClick={handleClick}
+            aria-label={`Update available: v${update.latestVersion}`}
+            title={`Update available: v${update.latestVersion}`}
+            style={{ borderRight: '1px solid var(--app-frame-border)' }}
+        >
+                            <div style={{ marginRight: '12px' }}>
+                                     <div style={{
+                                width: 20,
+                                height: 20,
+                                overflow: 'hidden',
+                                display: 'flex',
+                                alignItems: 'center',
+                                justifyContent: 'center',
+                                flexShrink: 0
+                            }}>
+                                <img
+                                    src={updateIcon}
+                                    alt=""
+                                    style={{
+                                        width: 20,
+                                        height: 20,
+                                        transform: 'translateX(-1000px)',
+                                        filter: `drop-shadow(1000px 0 0 #3ba55c)`,
+                                    }}
+                                />
+                            </div>
+                            </div>
+        </button>
+    );
+}

Frontend/Electron/src/index.css

@@ -2816,6 +2816,63 @@ body {
   width: 200px;
 }
 
+/* ============================================
+   FORCED UPDATE MODAL (Flatpak)
+   ============================================ */
+.forced-update-overlay {
+  position: fixed;
+  top: 0;
+  left: 0;
+  right: 0;
+  bottom: 0;
+  background-color: rgba(0, 0, 0, 0.85);
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  z-index: 10002;
+}
+
+.forced-update-modal {
+  background-color: var(--bg-secondary);
+  border-radius: 8px;
+  padding: 32px;
+  width: 400px;
+  max-width: 90vw;
+  text-align: center;
+  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
+}
+
+.forced-update-modal h2 {
+  color: var(--header-primary);
+  font-size: 20px;
+  font-weight: 700;
+  margin: 0 0 8px;
+}
+
+.forced-update-modal p {
+  color: var(--header-secondary);
+  font-size: 14px;
+  margin: 0 0 24px;
+  line-height: 1.4;
+}
+
+.forced-update-btn {
+  background-color: var(--brand-experiment);
+  color: white;
+  border: none;
+  border-radius: 3px;
+  padding: 10px 24px;
+  font-size: 14px;
+  font-weight: 600;
+  cursor: pointer;
+  font-family: inherit;
+  transition: background-color 0.15s;
+}
+
+.forced-update-btn:hover {
+  background-color: var(--brand-experiment-hover);
+}
+
 .drag-overlay-category {
   padding: 8px 12px;
   background-color: var(--bg-secondary);

Frontend/Electron/src/main.jsx

@@ -8,6 +8,7 @@ import './index.css';
 
 import { ThemeProvider } from './contexts/ThemeContext';
 import { VoiceProvider } from './contexts/VoiceContext';
+import { UpdateProvider } from './components/UpdateBanner';
 import TitleBar from './components/TitleBar';
 
 const convex = new ConvexReactClient(import.meta.env.VITE_CONVEX_URL);
@@ -15,6 +16,7 @@ const convex = new ConvexReactClient(import.meta.env.VITE_CONVEX_URL);
 ReactDOM.createRoot(document.getElementById('root')).render(
   <React.StrictMode>
     <ThemeProvider>
+      <UpdateProvider>
         <ConvexProvider client={convex}>
           <VoiceProvider>
             <TitleBar />
@@ -23,6 +25,7 @@ ReactDOM.createRoot(document.getElementById('root')).render(
             </HashRouter>
           </VoiceProvider>
         </ConvexProvider>
+      </UpdateProvider>
     </ThemeProvider>
   </React.StrictMode>,
 );