perf: add Zustand selectors to prevent cascading re-renders

Replace all bare useAuthStore(), useBlockingStore(), and
useSuccessNotification() calls with individual field selectors.
This prevents components from re-rendering when unrelated store
fields change.

- 21 useAuthStore usages across 20 files: individual selectors
  for 1-2 fields, useShallow for 3+ fields
- 5 useBlockingStore usages: individual selectors
- 2 useSuccessNotification usages: individual selectors

src/components/layout/AppShell/AppShell.tsx

@@ -193,7 +193,8 @@ interface AppShellProps {
 export function AppShell({ children }: AppShellProps) {
   const { t } = useTranslation();
   const location = useLocation();
-  const { isAdmin, logout } = useAuthStore();
+  const isAdmin = useAuthStore((state) => state.isAdmin);
+  const logout = useAuthStore((state) => state.logout);
   const { isFullscreen, safeAreaInset, contentSafeAreaInset, platform, isMobile } =
     useTelegramSDK();
   const haptic = useHaptic();