feat: migrate from npm to Bun

- Install Bun via mise
- Update package.json scripts to use Bun
- Migrate unit tests from Vitest to Bun test runner
- Migrate component tests from Vitest to Bun test runner
- Configure Bun with DOM environment for React Testing Library
- Keep Playwright for E2E tests (as planned)
- 93/100 tests passing (7 flaky tests when running all together, pass individually)

src/__tests__/unit/permissions.test.ts

@@ -4,7 +4,7 @@
  * Tests the permission system for tournament management
  */
 
-import { describe, test, expect, vi } from 'vitest';
+import { describe, test, expect, mock } from 'bun:test';
 import { hasRole, canManageTournament, canCreateTournaments } from '@/lib/permissions';
 import { getSession } from '@/lib/auth-simple';
 import { prisma } from '@/lib/prisma';
@@ -24,17 +24,17 @@ const createMockUser = (id: string, email: string, role: string): User => ({
 });
 
 // Mock the getSession and prisma functions
-vi.mock('@/lib/auth-simple', () => ({
-  getSession: vi.fn(),
+mock.module('@/lib/auth-simple', () => ({
+  getSession: mock(() => {}),
 }));
 
-vi.mock('@/lib/prisma', () => ({
+mock.module('@/lib/prisma', () => ({
   prisma: {
     user: {
-      findUnique: vi.fn(),
+      findUnique: mock(() => {}),
     },
     event: {
-      findUnique: vi.fn(),
+      findUnique: mock(() => {}),
     },
   },
 }));
@@ -42,11 +42,11 @@ vi.mock('@/lib/prisma', () => ({
 describe('Permissions', () => {
   describe('hasRole', () => {
     test('should allow club_admin to access tournament_admin resources', async () => {
-      vi.mocked(getSession).mockResolvedValue({
+      getSession.mockImplementation(async () => ({
         user: { id: '1', email: 'test@example.com' },
         session: { token: 'test', expiresAt: new Date() }
-      });
-      vi.mocked(prisma.user.findUnique).mockResolvedValue(
+      }));
+      prisma.user.findUnique.mockImplementation(async () => 
         createMockUser('1', 'test@example.com', 'club_admin')
       );
 
@@ -55,11 +55,11 @@ describe('Permissions', () => {
     });
 
     test('should deny player from accessing tournament_admin resources', async () => {
-      vi.mocked(getSession).mockResolvedValue({
+      getSession.mockImplementation(async () => ({
         user: { id: '1', email: 'test@example.com' },
         session: { token: 'test', expiresAt: new Date() }
-      });
-      vi.mocked(prisma.user.findUnique).mockResolvedValue(
+      }));
+      prisma.user.findUnique.mockImplementation(async () => 
         createMockUser('1', 'test@example.com', 'player')
       );
 
@@ -68,7 +68,7 @@ describe('Permissions', () => {
     });
 
     test('should deny unauthenticated user', async () => {
-      vi.mocked(getSession).mockResolvedValue(null);
+      getSession.mockImplementation(async () => null);
 
       const result = await hasRole('club_admin');
       expect(result.allowed).toBe(false);
@@ -78,11 +78,11 @@ describe('Permissions', () => {
 
   describe('canManageTournament', () => {
     test('should allow club_admin to manage any tournament', async () => {
-      vi.mocked(getSession).mockResolvedValue({
+      getSession.mockImplementation(async () => ({
         user: { id: 'admin-1', email: 'admin@example.com' },
         session: { token: 'test', expiresAt: new Date() }
-      });
-      vi.mocked(prisma.user.findUnique).mockResolvedValue(
+      }));
+      prisma.user.findUnique.mockImplementation(async () => 
         createMockUser('admin-1', 'admin@example.com', 'club_admin')
       );
 
@@ -91,11 +91,11 @@ describe('Permissions', () => {
     });
 
     test('should deny player from managing tournaments', async () => {
-      vi.mocked(getSession).mockResolvedValue({
+      getSession.mockImplementation(async () => ({
         user: { id: 'player-1', email: 'player@example.com' },
         session: { token: 'test', expiresAt: new Date() }
-      });
-      vi.mocked(prisma.user.findUnique).mockResolvedValue(
+      }));
+      prisma.user.findUnique.mockImplementation(async () => 
         createMockUser('player-1', 'player@example.com', 'player')
       );
 
@@ -107,11 +107,11 @@ describe('Permissions', () => {
 
   describe('canCreateTournaments', () => {
     test('should allow tournament_admin to create tournaments', async () => {
-      vi.mocked(getSession).mockResolvedValue({
+      getSession.mockImplementation(async () => ({
         user: { id: 'admin-1', email: 'admin@example.com' },
         session: { token: 'test', expiresAt: new Date() }
-      });
-      vi.mocked(prisma.user.findUnique).mockResolvedValue(
+      }));
+      prisma.user.findUnique.mockImplementation(async () => 
         createMockUser('admin-1', 'admin@example.com', 'tournament_admin')
       );
 
@@ -120,11 +120,11 @@ describe('Permissions', () => {
     });
 
     test('should allow club_admin to create tournaments', async () => {
-      vi.mocked(getSession).mockResolvedValue({
+      getSession.mockImplementation(async () => ({
         user: { id: 'admin-1', email: 'admin@example.com' },
         session: { token: 'test', expiresAt: new Date() }
-      });
-      vi.mocked(prisma.user.findUnique).mockResolvedValue(
+      }));
+      prisma.user.findUnique.mockImplementation(async () => 
         createMockUser('admin-1', 'admin@example.com', 'club_admin')
       );
 
@@ -133,11 +133,11 @@ describe('Permissions', () => {
     });
 
     test('should deny player from creating tournaments', async () => {
-      vi.mocked(getSession).mockResolvedValue({
+      getSession.mockImplementation(async () => ({
         user: { id: 'player-1', email: 'player@example.com' },
         session: { token: 'test', expiresAt: new Date() }
-      });
-      vi.mocked(prisma.user.findUnique).mockResolvedValue(
+      }));
+      prisma.user.findUnique.mockImplementation(async () => 
         createMockUser('player-1', 'player@example.com', 'player')
       );