chore: remove dead code and tautological tests

Dead code (zero references anywhere, including tests):
- src/lib/ai/prompts/index.ts (165 lines) — prompt building moved
  server-side to supabase/functions/_shared/prompts.ts
- useKeyboardShortcuts, useResolvedTheme hooks
- isUrlSafe (validateUrl is the live entry point)
- requireAdmin in _shared/auth.ts — admin/index.ts does its own
  inline user_roles lookups
- getAppRedirectUrl in native.ts
- mockSparringResponse/mockSparringScore aliases
- buildSearchQueries wrapper — inlined the one-line .map into its
  two callers, which were both tests

Tests that assert nothing about our code:
- example.test.ts: expect(true).toBe(true)
- utils.test.ts: 11 tests over cn(), a one-line clsx+tailwind-merge
  pass-through — tested the libraries, not us
- providers.test.ts: 14 of 15 tests re-asserted that a static const
  is still a static const; kept the duplicate-model-ID check, which
  guards real routing behavior
- i18n.test.ts: "locale has keys" tautologies and a key-count check
  subsumed by the bidirectional key-set comparisons
- export-utils-extended.test.ts: 6 "typeof x === function" tests
- pages/HistoryPage smoke tests asserting document.body is defined
- settings-store-branches: the `afterRehydrate(undefined)` call
  existed only to hit an `if (!state) return` line

Preserved deliberately: setActiveEnv/IS_STAGING in supabase/env.ts
(reserved by plans/supabase-staging.md for the admin env switcher),
and security-hardening/runtime-contracts/vercel-deployment-config
tests, which guard invariants from PRs #26/#27.

Verified: 921 tests pass, lint clean, tsc clean, build succeeds,
coverage thresholds still met (statements 90.45/90, branches
82.91/80, functions 91.46/89, lines 94.04/90).

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

Author: Programcode

src/hooks/use-keyboard-shortcuts.ts

@@ -508,5 +508,3 @@ export async function mockJudgeSparringSession(input: SparringScoreInput): Promi
 }
 
 // Names kept short for callers that treat the mock provider as a feature adapter.
-export const mockSparringResponse = mockGenerateSparringTurn;
-export const mockSparringScore = mockJudgeSparringSession;

src/hooks/use-resolved-theme.ts

@@ -9,11 +9,6 @@ export function isNativeApp(): boolean {
   return Capacitor.isNativePlatform();
 }
 
-export function getAppRedirectUrl(path = '/app'): string {
-  if (isNativeApp()) return `${NATIVE_URL_SCHEME}://${path.replace(/^\/+/, '')}`;
-  return `${window.location.origin}${path}`;
-}
-
 export function getWebAppRedirectUrl(path = '/app'): string {
   const origin = isNativeApp() ? PUBLIC_WEB_APP_ORIGIN : window.location.origin;
   return `${origin}${path}`;

src/lib/ai/prompts/index.ts

@@ -55,11 +55,3 @@ export function validateUrl(url?: string): string | undefined {
         return undefined;
     }
 }
-
-/**
- * Checks if a URL is safe without normalizing it.
- * Useful for validation-only scenarios.
- */
-export function isUrlSafe(url?: string): boolean {
-    return validateUrl(url) !== undefined;
-}

src/lib/ai/providers/mock-provider.ts

@@ -225,29 +225,4 @@ describe('Export Utils - Extended', () => {
     });
   });
 
-  describe('PDF export functions exist', () => {
-    it('exportCaseToDocx is a function', () => {
-      expect(typeof exportCaseToDocx).toBe('function');
-    });
-
-    it('exportAttackToDocx is a function', () => {
-      expect(typeof exportAttackToDocx).toBe('function');
-    });
-
-    it('exportBrainstormToDocx is a function', () => {
-      expect(typeof exportBrainstormToDocx).toBe('function');
-    });
-
-    it('exportFactoidsToDocx is a function', () => {
-      expect(typeof exportFactoidsToDocx).toBe('function');
-    });
-
-    it('exportCaseToGoogleDocs is a function', () => {
-      expect(typeof exportCaseToGoogleDocs).toBe('function');
-    });
-
-    it('exportBrainstormToGoogleDocs is a function', () => {
-      expect(typeof exportBrainstormToGoogleDocs).toBe('function');
-    });
-  });
 });

src/lib/native.ts

@@ -32,23 +32,6 @@ describe('i18n locale files', () => {
   const esKeys = flattenKeys(es);
   const huKeys = flattenKeys(hu);
 
-  it('en.json has keys', () => {
-    expect(enKeys.length).toBeGreaterThan(0);
-  });
-
-  it('es.json has keys', () => {
-    expect(esKeys.length).toBeGreaterThan(0);
-  });
-
-  it('hu.json has keys', () => {
-    expect(huKeys.length).toBeGreaterThan(0);
-  });
-
-  it('all 3 locale files have same number of keys', () => {
-    expect(enKeys.length).toBe(esKeys.length);
-    expect(enKeys.length).toBe(huKeys.length);
-  });
-
   it('all keys in en.json exist in es.json', () => {
     const esKeySet = new Set(esKeys);
     const missing = enKeys.filter(k => !esKeySet.has(k));
@@ -100,15 +83,9 @@ describe('i18n locale files', () => {
 });
 
 describe('i18n runtime', () => {
-  it('i18n.t returns correct English value for nav.home', () => {
+  it('i18n.t resolves English nav values', () => {
     expect(i18n.t('nav.home')).toBe('Home');
-  });
-
-  it('i18n.t returns correct English value for nav.generate', () => {
     expect(i18n.t('nav.generate')).toBe('Generate');
-  });
-
-  it('i18n.t returns correct English value for nav.settings', () => {
     expect(i18n.t('nav.settings')).toBe('Settings');
   });
 
@@ -124,11 +101,6 @@ describe('i18n runtime', () => {
     await i18n.changeLanguage('en');
   });
 
-  it('i18n.changeLanguage back to en', async () => {
-    await i18n.changeLanguage('en');
-    expect(i18n.language).toBe('en');
-  });
-
   it('interpolation works for limitModal.limitReachedDesc', () => {
     const result = i18n.t('limitModal.limitReachedDesc', { current: 5, limit: 10 });
     expect(result).toContain('5');

src/lib/validation/url.ts

@@ -114,9 +114,4 @@ describe('HistoryPage', () => {
     const { container } = render(<HistoryPage />);
     expect(container.querySelector('.max-w-5xl')).not.toBeNull();
   });
-
-  it('renders without crashing with empty arrays', () => {
-    const { container } = render(<HistoryPage />);
-    expect(container).toBeDefined();
-  });
 });