Add EHSAN favicon and localized browser tab titles (Task #21)

The browser tab previously showed a generic placeholder favicon and the
English title "EHSAN Closed Donation Loop". Per the reference, the tab now
shows the EHSAN logo mark and an Arabic platform title.

Changes:
- Favicon: copied the existing EHSAN logo (src/assets/ehsan-logo.png) to
  public/favicon.png and pointed index.html at %BASE_URL%favicon.png
  (base-path safe; verified it serves 200 image/png).
- Static head: index.html <title> and OG/Twitter titles + description now
  use the Arabic platform name "منصة إحسان".
- Per-page titles: added a DocumentTitle component
  (src/hooks/useDocumentTitle.ts) rendered in the Router that sets
  document.title to "<page name> - <platform>" based on the current wouter
  path and active language, reading from a new translations.meta section
  (AR + EN). Home reads "الصفحة الرئيسية - منصة إحسان"; switches with language.

Approach note: titles are centralized in the router rather than edited into
each page file, keeping it DRY while covering all main routes.

Verified: tsc clean; e2e confirmed titles on /, /opportunities, /cart and
English fallback ("Home - EHSAN Platform"), plus favicon load.

artifacts/ehsan-poc/src/App.tsx

@@ -6,6 +6,7 @@ import { LanguageProvider } from "./contexts/LanguageContext";
 import { CartProvider } from "./contexts/CartContext";
 import { AuthProvider, useAuth } from "./contexts/AuthContext";
 import { AppLayout } from "./components/layout/AppLayout";
+import { DocumentTitle } from "./hooks/useDocumentTitle";
 import NotFound from "@/pages/not-found";
 import { ComponentType } from "react";
 
@@ -37,6 +38,7 @@ function Protected({ component: Component }: { component: ComponentType<any> })
 function Router() {
   return (
     <AppLayout>
+      <DocumentTitle />
       <Switch>
         <Route path="/" component={Home} />
         <Route path="/about/:section?" component={About} />

artifacts/ehsan-poc/src/hooks/useDocumentTitle.ts

@@ -0,0 +1,33 @@
+import { useEffect } from "react";
+import { useLocation } from "wouter";
+import { useLanguage } from "../contexts/LanguageContext";
+
+function pageNameForPath(path: string, meta: Record<string, string>): string {
+  if (path === "/" || path === "") return meta.home;
+  if (path.startsWith("/opportunities")) return meta.opportunities;
+  if (path.startsWith("/cart")) return meta.cart;
+  if (path.startsWith("/about")) return meta.about;
+  if (path.startsWith("/track")) return meta.track;
+  if (path.startsWith("/donate")) return meta.donate;
+  if (path.startsWith("/request")) return meta.request;
+  if (path.startsWith("/waqf")) return meta.waqf;
+  if (path.startsWith("/baraem")) return meta.baraem;
+  if (path.startsWith("/admin")) return meta.admin;
+  if (path.startsWith("/whatsapp-log")) return meta.whatsappLog;
+  if (path.startsWith("/thank-you")) return meta.thankYou;
+  if (path.startsWith("/login")) return meta.login;
+  return "";
+}
+
+export function DocumentTitle() {
+  const [location] = useLocation();
+  const { t } = useLanguage();
+
+  useEffect(() => {
+    const meta = t.meta as Record<string, string>;
+    const name = pageNameForPath(location, meta);
+    document.title = name ? `${name} - ${meta.platform}` : meta.platform;
+  }, [location, t]);
+
+  return null;
+}

artifacts/ehsan-poc/src/lib/i18n/translations.ts

@@ -1,4 +1,20 @@
 export const en = {
+  meta: {
+    platform: "EHSAN Platform",
+    home: "Home",
+    opportunities: "Donation Opportunities",
+    cart: "Your Donation Cart",
+    about: "About EHSAN",
+    track: "Track Case",
+    donate: "Complete Donation",
+    request: "Request Support",
+    waqf: "Endowment",
+    baraem: "EHSAN Buds",
+    admin: "Admin Dashboard",
+    whatsappLog: "WhatsApp Log",
+    thankYou: "Submit Thank You",
+    login: "Login",
+  },
   common: {
     ehsan: "EHSAN",
     home: "Home",
@@ -400,6 +416,22 @@ export const en = {
 };
 
 export const ar = {
+  meta: {
+    platform: "منصة إحسان",
+    home: "الصفحة الرئيسية",
+    opportunities: "فرص التبرع",
+    cart: "سلة تبرعاتك",
+    about: "عن إحسان",
+    track: "تتبع الحالة",
+    donate: "إتمام التبرع",
+    request: "طلب دعم",
+    waqf: "الوقف",
+    baraem: "براعم إحسان",
+    admin: "لوحة الإدارة",
+    whatsappLog: "سجل واتساب",
+    thankYou: "إرسال شكر",
+    login: "تسجيل الدخول",
+  },
   common: {
     ehsan: "إحسان",
     home: "الرئيسية",