fix(frontend): move dashboard to /dashboard route

The dashboard page was created at (authenticated)/page.tsx which would
serve the same route as [locale]/page.tsx (the public landing page).
Next.js doesn't allow route groups to override parent pages.

Changes:
- Move dashboard page to (authenticated)/dashboard/page.tsx
- Update Header nav links to point to /dashboard
- Update AppBreadcrumbs home link to /dashboard
- Update E2E tests to navigate to /dashboard

Now authenticated users should navigate to /dashboard for their homepage,
while /en serves the public landing page for unauthenticated users.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

frontend/e2e/main-dashboard.spec.ts

@@ -23,6 +23,7 @@ test.describe('Main Dashboard Page', () => {
 
   test('should display welcome header with user name', async ({ page }) => {
     await loginViaUI(page);
+    await page.goto('/en/dashboard');
     await page.waitForLoadState('networkidle');
 
     // Check for welcome message
@@ -32,6 +33,7 @@ test.describe('Main Dashboard Page', () => {
 
   test('should display quick stats cards', async ({ page }) => {
     await loginViaUI(page);
+    await page.goto('/en/dashboard');
     await page.waitForLoadState('networkidle');
 
     // Check for stats cards
@@ -43,6 +45,7 @@ test.describe('Main Dashboard Page', () => {
 
   test('should display recent projects section', async ({ page }) => {
     await loginViaUI(page);
+    await page.goto('/en/dashboard');
     await page.waitForLoadState('networkidle');
 
     // Check recent projects heading
@@ -56,6 +59,7 @@ test.describe('Main Dashboard Page', () => {
 
   test('should navigate to projects page when clicking View all', async ({ page }) => {
     await loginViaUI(page);
+    await page.goto('/en/dashboard');
     await page.waitForLoadState('networkidle');
 
     // Click view all link
@@ -68,6 +72,7 @@ test.describe('Main Dashboard Page', () => {
 
   test('should have Create Project button', async ({ page }) => {
     await loginViaUI(page);
+    await page.goto('/en/dashboard');
     await page.waitForLoadState('networkidle');
 
     // Check for create project button
@@ -77,6 +82,7 @@ test.describe('Main Dashboard Page', () => {
 
   test('should display pending approvals when they exist', async ({ page }) => {
     await loginViaUI(page);
+    await page.goto('/en/dashboard');
     await page.waitForLoadState('networkidle');
 
     // Check for pending approvals section
@@ -87,6 +93,7 @@ test.describe('Main Dashboard Page', () => {
 
   test('should have accessible heading hierarchy', async ({ page }) => {
     await loginViaUI(page);
+    await page.goto('/en/dashboard');
     await page.waitForLoadState('networkidle');
 
     // Check for h1 (welcome message)
@@ -100,6 +107,7 @@ test.describe('Main Dashboard Page', () => {
 
   test('should be keyboard navigable', async ({ page }) => {
     await loginViaUI(page);
+    await page.goto('/en/dashboard');
     await page.waitForLoadState('networkidle');
 
     // Tab through the page elements
@@ -115,6 +123,7 @@ test.describe('Main Dashboard Page', () => {
     await page.setViewportSize({ width: 375, height: 667 });
 
     await loginViaUI(page);
+    await page.goto('/en/dashboard');
     await page.waitForLoadState('networkidle');
 
     // Page should still be functional on mobile
@@ -127,6 +136,7 @@ test.describe('Main Dashboard Page', () => {
 
     // Measure navigation timing
     const start = Date.now();
+    await page.goto('/en/dashboard');
     await page.waitForLoadState('networkidle');
     const duration = Date.now() - start;
 
@@ -144,6 +154,7 @@ test.describe('Main Dashboard Empty State', () => {
     // This tests the empty state path - in demo mode we have mock data
     // so we check for the empty state component being available
     await loginViaUI(page);
+    await page.goto('/en/dashboard');
     await page.waitForLoadState('networkidle');
 
     // In demo mode we always have projects, but the empty state exists
@@ -160,6 +171,7 @@ test.describe('Main Dashboard Stats Interaction', () => {
 
   test('should display stats with numeric values', async ({ page }) => {
     await loginViaUI(page);
+    await page.goto('/en/dashboard');
     await page.waitForLoadState('networkidle');
 
     // Stats should show numbers
@@ -169,6 +181,7 @@ test.describe('Main Dashboard Stats Interaction', () => {
 
   test('should make stats cards clickable where appropriate', async ({ page }) => {
     await loginViaUI(page);
+    await page.goto('/en/dashboard');
     await page.waitForLoadState('networkidle');
 
     // Active Projects stat should link to projects

frontend/e2e/projects-list.spec.ts

@@ -125,6 +125,7 @@ test.describe('Projects List Page', () => {
 
   test('should be accessible from dashboard', async ({ page }) => {
     await loginViaUI(page);
+    await page.goto('/en/dashboard');
     await page.waitForLoadState('networkidle');
 
     // Click "View all" link from dashboard