PWA widgets dashboard, lock screen, screensaver with active category

- Dashboard (/dashboard): configurable widget system with 6 widget types
  (current_tasks, category_time, today_progress, next_task, motivace, calendar_mini)
  stored in localStorage widget_config
- Lock screen (/lockscreen): fullscreen with clock, active group badge,
  up to 4 current tasks, gradient from group color, swipe/tap to unlock
- InactivityMonitor: auto-redirect to lockscreen after configurable timeout
  (only in PWA standalone/fullscreen mode)
- Settings: widget toggle switches, inactivity timeout slider, lockscreen preview
- manifest.json: added display_override ["fullscreen","standalone"] + orientation portrait

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

apps/tasks/app/layout.tsx

@@ -4,6 +4,7 @@ import ThemeProvider from "@/components/ThemeProvider";
 import AuthProvider from "@/components/AuthProvider";
 import Header from "@/components/Header";
 import BottomNav from "@/components/BottomNav";
+import InactivityMonitor from "@/components/InactivityMonitor";
 import { I18nProvider } from "@/lib/i18n";
 
 export const metadata: Metadata = {
@@ -44,6 +45,7 @@ export default function RootLayout({
                 {children}
               </main>
               <BottomNav />
+              <InactivityMonitor />
             </AuthProvider>
           </ThemeProvider>
         </I18nProvider>