Add public account-deletion page for Google Play (#103) (#110)

## Summary
- Closes [#103](#103).
- Adds public SPA route `/account-deletion/` (no auth) with Hesychia / `ai.hesychia.chat` branding, in-app deletion steps, soft-delete data retention copy, and a contact path (30-day SLA) for users who cannot sign in.
- Documents Play Console **Account deletion URL** in `ANDROID.md` and `android/README.md` (`https://hesychia.ai/account-deletion/`, legacy host, HashRouter form).

## Notes
- Retention copy matches backend soft-delete (v1): no claim of full erasure / hard purge yet.
- Play Console field still needs to be set out-of-band after deploy.

## Test plan
- [ ] Open `/account-deletion/` signed out — page loads (no redirect to sign-in)
- [ ] Confirm steps match Account → Delete my account + email confirm
- [ ] Confirm retention sections are accurate vs soft-delete
- [ ] `npm run test:ci -- --testPathPattern=AccountDeletionPage`
- [ ] After beta deploy, set Play Console Account deletion URL to the public HTTPS URLReviewed-on: #110

llm-fe/src/App.tsx

@@ -11,6 +11,7 @@ import NotFound from './llm-fe/pages/NotFound/NotFound';
 import { AuthContext } from './llm-fe/contexts/AuthContext';
 import TermsOfService from './llm-fe/pages/TermsOfService/TermsOfService';
 import PublicTermsOfServicePage from './llm-fe/pages/TermsOfService/PublicTermsOfServicePage';
+import AccountDeletionPage from './llm-fe/pages/AccountDeletion/AccountDeletionPage';
 import SetPassword from './llm-fe/components/SetPassword/SetPassword';
 import AsyncDashboard2 from './llm-fe/pages/AsyncDashboard2/AsyncDashboard2';
 import FeedbackPage2 from './llm-fe/pages/FeedbackPage2/FeedbackPage2';
@@ -71,6 +72,8 @@ class App extends Component {
                 {/* Public legal pages (also used for post-login ToS acknowledge) */}
                 <Route path={"/terms_of_service/"} Component={TermsOfService} />
                 <Route path={"/legal/terms-of-service"} Component={PublicTermsOfServicePage} />
+                {/* Play Console account-deletion URL (#103) — must stay public */}
+                <Route path={"/account-deletion/"} Component={AccountDeletionPage} />
 
                 <Route element={<ProtectedRoutes />}>
                   <Route path={"/"} index={true} Component={AsyncDashboard2} />