feat: enhance branding options with custom favicon and logos in configuration

app/api/config/route.ts

@@ -26,6 +26,9 @@ export async function GET() {
     settingsSyncEnabled: process.env.SETTINGS_SYNC_ENABLED === 'true' && !!process.env.SESSION_SECRET,
     stalwartFeaturesEnabled: process.env.STALWART_FEATURES !== 'false',
     devMode: process.env.DEV_MOCK_JMAP === 'true',
+    faviconUrl: process.env.FAVICON_URL || '/branding/Bulwark_Favicon.svg',
+    appLogoLightUrl: process.env.APP_LOGO_LIGHT_URL || '',
+    appLogoDarkUrl: process.env.APP_LOGO_DARK_URL || '',
     loginLogoLightUrl: process.env.LOGIN_LOGO_LIGHT_URL || '/branding/Bulwark_Logo_Color.svg',
     loginLogoDarkUrl: process.env.LOGIN_LOGO_DARK_URL || '/branding/Bulwark_Logo_White.svg',
     loginCompanyName: process.env.LOGIN_COMPANY_NAME || '',

app/layout.tsx

@@ -14,10 +14,15 @@ const geistMono = Geist_Mono({
   subsets: ["latin"],
 });
 
-export const metadata: Metadata = {
-  title: process.env.APP_NAME || process.env.NEXT_PUBLIC_APP_NAME || "Webmail",
-  description: "Minimalist webmail client using JMAP protocol",
-};
+export async function generateMetadata(): Promise<Metadata> {
+  const faviconUrl = process.env.FAVICON_URL;
+
+  return {
+    title: process.env.APP_NAME || process.env.NEXT_PUBLIC_APP_NAME || "Webmail",
+    description: "Minimalist webmail client using JMAP protocol",
+    ...(faviconUrl ? { icons: { icon: faviconUrl } } : {}),
+  };
+}
 
 export default async function RootLayout({
   children,