design: implement dynamic theme-based app icons for system tray and taskbar

frontend/electron/main.ts

@@ -135,7 +135,14 @@ const createTray = () => {
     tray = new Tray(icon);
     tray.setToolTip('Ultimate Ban Tracker');
     tray.on('click', () => { if (mainWindow) { mainWindow.show(); mainWindow.focus(); } });
-    updateTrayMenu();
+    
+    // Load initial themed icon
+    const config = store.get('serverConfig');
+    if (config?.theme) {
+      setAppIcon(config.theme);
+    } else {
+      updateTrayMenu(); // Fallback to refresh menu
+    }
   } catch (e) { }
 };
 
@@ -162,6 +169,25 @@ const updateTrayMenu = () => {
   tray.setContextMenu(contextMenu);
 };
 
+const setAppIcon = (themeName: string = 'steam') => {
+  const assetsDir = path.join(__dirname, '..', 'assets-build', 'icons');
+  const iconPath = path.join(assetsDir, `${themeName}.svg`);
+  
+  if (!fs.existsSync(iconPath)) return;
+
+  const icon = nativeImage.createFromPath(iconPath);
+  
+  // Update Tray
+  if (tray) {
+    tray.setImage(icon.resize({ width: 16, height: 16 }));
+  }
+
+  // Update Main Window
+  if (mainWindow) {
+    mainWindow.setIcon(icon);
+  }
+};
+
 // --- Steam Logic ---
 const killSteam = async () => {
   return new Promise<void>((resolve) => {
@@ -571,6 +597,13 @@ ipcMain.handle('admin-delete-user', async (event, userId: string) => { initBacke
 ipcMain.handle('admin-get-accounts', async () => { initBackend(); return backend ? await backend.getAdminAccounts() : []; });
 ipcMain.handle('admin-remove-account', async (event, steamId: string) => { initBackend(); if (backend) await backend.forceRemoveAccount(steamId); return true; });
 
+ipcMain.handle('force-sync', async () => { await syncAccounts(true); return true; });
+
+ipcMain.handle('update-app-icon', (event, themeName: string) => {
+  setAppIcon(themeName);
+  return true;
+});
+
 ipcMain.handle('switch-account', async (event, loginName: string) => {
   if (!loginName) return false;
   try {

frontend/electron/preload.ts

@@ -10,6 +10,7 @@ contextBridge.exposeInMainWorld('electronAPI', {
   revokeAccountAccess: (steamId: string, targetSteamId: string) => ipcRenderer.invoke('revoke-account-access', steamId, targetSteamId),
   revokeAllAccountAccess: (steamId: string) => ipcRenderer.invoke('revoke-all-account-access', steamId),
   openExternal: (url: string) => ipcRenderer.invoke('open-external', url),
+  updateAppIcon: (theme: string) => ipcRenderer.invoke('update-app-icon', theme),
   openSteamAppLogin: () => ipcRenderer.invoke('open-steam-app-login'),
   openSteamLogin: (steamId: string) => ipcRenderer.invoke('open-steam-login', steamId),