Add a dedicated focus mode to help users enhance concentration and productivity

Implements FocusPage with Pomodoro timer, ambient sounds, and distraction blocking; adds route in App.tsx and sidebar link.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: c5f0c281-8dd8-4846-b452-4a07bcd21062
Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/9777c70b-fc38-4831-8d6b-78dfffe041b0/d79f2b79-df7a-44d0-b937-b161f4d6d0d7.jpg

client/src/App.tsx

@@ -21,6 +21,7 @@ import AIPage from "@/pages/AIPage";
 import AnalyticsPage from "@/pages/AnalyticsPage";
 import SystemMonitoringPage from "@/pages/SystemMonitoringPage";
 import SettingsPage from "@/pages/SettingsPage";
+import FocusPage from "@/pages/FocusPage";
 import NotFound from "@/pages/not-found";
 
 function Router() {
@@ -37,6 +38,7 @@ function Router() {
       <Route path="/ai" component={AIPage} />
       <Route path="/analytics" component={AnalyticsPage} />
       <Route path="/monitoring" component={SystemMonitoringPage} />
+      <Route path="/focus" component={FocusPage} />
       <Route path="/settings" component={SettingsPage} />
       <Route path="/professionals" component={ProfessionalDirectory} />
       <Route component={NotFound} />