fix: resolve all Playwright test failures — 16/16 passing

- Fix procedural session tests: sessions auto-start, no Start button
- Fix strict mode violations: use getByRole('heading') for step titles
- Fix FlowPilot chat: use button role selector for New Chat
- Fix command palette page nav: scope Analytics click to palette modal
- Fix fallback runner: remove non-existent Start button click
- Update playwright.config to port 5433 for local Docker

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

frontend/e2e/command-palette.spec.ts

@@ -61,11 +61,12 @@ test.describe('command palette smoke tests', () => {
     await expect(input).toBeVisible()
     await input.fill('analytics')
 
-    // Pages section should appear
-    await expect(page.getByText('Pages')).toBeVisible({ timeout: 3000 })
+    // Pages section should appear in the palette
+    const palette = page.locator('.animate-scale-in')
+    await expect(palette.getByText('Pages')).toBeVisible({ timeout: 3000 })
 
-    // Select the analytics page result (use last() to avoid matching sidebar nav)
-    await page.getByText('Analytics').last().click()
+    // Select the analytics page result — use the heading within the palette item
+    await palette.getByText('Analytics', { exact: true }).first().click()
 
     await expect(page).toHaveURL(/\/analytics/)
   })