feat(frontend): Phase 2/3 hardening release

Roadmap P0
- Ship /logo.svg fallback and rewire asset references (superseded later by
  the project-manager PNG in a separate commit).

Roadmap P1
- Response envelope alignment ({items,total,page,size}) across services
  and query hooks.
- Approval/ticket UX updates tied to the new backend rollback semantics.

Roadmap P2
- React.lazy + Vite manualChunks to split vendor-radix/charts/icons/forms
  from the main bundle and cut initial JS.
- Fix the 181 tsc errors (PaginationParams class + per-service generics).
- Auto-refresh flow for JWT refresh tokens wired into api-client.ts.

Roadmap P3
- i18n: i18next + language detector, en/ar locales, RTL auto-switch,
  LanguageToggle component in RoleLayout and AdminLmsLayout.
- GDPR: PrivacyCenter page for data export and right-to-erasure, backed
  by gdpr.service.ts; logout via AuthContext after erasure.
- Human-in-the-loop exam review UI: admin ExamReviewQueue + ExamReviewDetail
  pages, useExamReview hooks, exam-review.service.ts.
- AI quality loop: AIPromptEditor (versioning + render preview),
  AIFeedbackButtons for students, AIFeedbackTriage admin page, dedicated
  services, hooks, and types.
- Dark mode: ThemeProvider + ThemeToggle + chart color tokens.
- Accessibility: DialogDescription on every DialogContent; alert-dialog
  and sheet updates.
- Retire dead pages: ExamPage marketing, Index, ProfilePage import.
- Playwright e2e scaffolding: playwright.config.ts + e2e/login.spec.ts
  smoke tests, npm scripts test:e2e / test:e2e:install.

Made-with: Cursor

src/i18n/locales/en.ts

@@ -0,0 +1,97 @@
+/** English translations. Keep keys nested by feature area.
+ *
+ * We deliberately annotate the literal with `Translations` (not `as const`)
+ * so sibling locale files can widen their string values without fighting
+ * literal-string type mismatches.
+ */
+export interface Translations {
+  common: Record<string, string>;
+  auth: Record<string, string>;
+  nav: Record<string, string>;
+  privacy: Record<string, string>;
+  feedback: Record<string, string>;
+  theme: Record<string, string>;
+}
+
+const en: Translations = {
+  common: {
+    cancel: "Cancel",
+    save: "Save",
+    delete: "Delete",
+    edit: "Edit",
+    close: "Close",
+    back: "Back",
+    next: "Next",
+    search: "Search",
+    loading: "Loading…",
+    error: "Error",
+    retry: "Retry",
+    yes: "Yes",
+    no: "No",
+    actions: "Actions",
+    status: "Status",
+    settings: "Settings",
+    signOut: "Sign out",
+  },
+  auth: {
+    signIn: "Sign in",
+    signInTitle: "Sign in to EnCoach",
+    email: "Email",
+    password: "Password",
+    forgotPassword: "Forgot password?",
+    needAccount: "Don't have an account?",
+    signUp: "Sign up",
+    invalidCredentials: "Invalid email or password",
+  },
+  nav: {
+    dashboard: "Dashboard",
+    courses: "Courses",
+    students: "Students",
+    teachers: "Teachers",
+    exams: "Exams",
+    reports: "Reports",
+    settings: "Settings",
+    profile: "Profile",
+    privacy: "Privacy Center",
+    reviewQueue: "Review Queue",
+    aiPrompts: "AI Prompts",
+    aiFeedback: "AI Feedback",
+  },
+  privacy: {
+    title: "Privacy Center",
+    description:
+      "Manage your personal data held by EnCoach under GDPR and equivalent regulations.",
+    exportTitle: "Download your data",
+    exportDescription:
+      "We'll package your profile, entity memberships, exam attempts, answers, AI feedback, and tickets into a single JSON file.",
+    exportButton: "Download my data",
+    exportPreparing: "Preparing export…",
+    exportSuccess: "Data export downloaded",
+    deleteTitle: "Delete my account",
+    deleteDescription:
+      "This anonymises your profile and removes personal fields from our records. Exam attempts are retained (without identifying information) for statistical integrity. This action cannot be undone.",
+    deleteButton: "Erase my account",
+    deleteErasing: "Erasing…",
+    confirmTitle: "Erase your account?",
+    confirmDescription:
+      "We'll anonymise your personal data and deactivate your login. Aggregate analytics will remain but will no longer be linked to you.",
+    confirmTypeDelete: "Type DELETE to confirm",
+    confirmErased: "Your account has been erased. Signing out…",
+  },
+  feedback: {
+    thumbsUp: "Thumbs up",
+    thumbsDown: "Thumbs down",
+    whatWentWrong: "What went wrong?",
+    commentPlaceholder: "e.g. Wrong answer, confusing wording, off-topic…",
+    commentRequired: "Please tell us what was wrong.",
+    submit: "Submit feedback",
+  },
+  theme: {
+    title: "Theme",
+    light: "Light",
+    dark: "Dark",
+    system: "System",
+  },
+};
+
+export default en;