fix(auth): enable sync on login/logout + fix data copy + wire page-view tracking

web/src/app/providers.tsx

@@ -1,14 +1,23 @@
 'use client';
 
 import { useEffect } from 'react';
+import { usePathname } from 'next/navigation';
 import { AuthProvider } from '@/lib/auth-context';
-import { initTelemetry } from '@/lib/telemetry';
+import { initTelemetry, trackPageView } from '@/lib/telemetry';
 import type { ReactNode } from 'react';
 
 export function Providers({ children }: { children: ReactNode }) {
+  const pathname = usePathname();
+
   useEffect(() => {
     initTelemetry();
   }, []);
 
+  useEffect(() => {
+    if (pathname) {
+      trackPageView(pathname);
+    }
+  }, [pathname]);
+
   return <AuthProvider>{children}</AuthProvider>;
 }

web/src/app/settings/page.tsx

@@ -349,7 +349,7 @@ export default function SettingsPage() {
               </button>
             </div>
             <p className="text-xs mt-3" style={{ color: 'var(--cm-text-tertiary)' }}>
-              All data is stored locally in your browser. No data is sent to any server.
+              Timer data is stored locally in your browser. Anonymous usage analytics are sent to improve the app.
               See our <Link href="/privacy" style={{ color: 'var(--cm-accent)' }}>Privacy Policy</Link>.
             </p>
           </div>

web/src/lib/auth-context.tsx

@@ -10,6 +10,7 @@ import {
   registerUser,
   getMe,
   setAuthToken,
+  setSyncEnabled,
   isAuthenticated as checkAuth,
   type AuthUser,
 } from './platform-sync';
@@ -56,6 +57,7 @@ export function AuthProvider({ children }: { children: ReactNode }) {
     try {
       const result = await loginUser(email, password);
       setAuthToken(result.accessToken);
+      setSyncEnabled(true);
       setUser(result.user);
       return true;
     } catch (err) {
@@ -70,6 +72,7 @@ export function AuthProvider({ children }: { children: ReactNode }) {
       try {
         const result = await registerUser(email, password, displayName);
         setAuthToken(result.accessToken);
+        setSyncEnabled(true);
         setUser(result.user);
         return true;
       } catch (err) {
@@ -82,6 +85,7 @@ export function AuthProvider({ children }: { children: ReactNode }) {
 
   const logout = useCallback(() => {
     setAuthToken(null);
+    setSyncEnabled(false);
     setUser(null);
   }, []);