fix: update Playwright test selectors to match actual UI

- Use specific command palette placeholder to avoid ambiguous matches
- Fix 'Quick Actions' scoping (two elements with same text)
- Fix 'Resolved' exact match on session detail page
- Fix tree editor to use getByText instead of getByDisplayValue
- Fix 'Add Step' strict mode by using .first()
- Fix fallback description placeholder text
- Update playwright.config.ts to use port 5433 and resolutionflow DB
- Update FlowPilot chat selectors to match actual page layout

11/17 new tests now passing. Remaining 6 need procedural session
navigation investigation.

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

frontend/e2e/fallback-branches.spec.ts

@@ -40,7 +40,7 @@ test.describe('fallback branches smoke tests', () => {
       await fallbackInput.fill('Try alternative ping method')
 
       // Fill description
-      const descInput = page.getByPlaceholder('What to try instead...')
+      const descInput = page.getByPlaceholder('Describe this alternative approach...')
       await expect(descInput).toBeVisible()
       await descInput.fill('Use traceroute if ping fails')
 
@@ -60,7 +60,7 @@ test.describe('fallback branches smoke tests', () => {
     try {
       // Navigate to the procedural flow
       await page.goto(`/flows/${tree.id}/navigate`)
-      await expect(page.getByRole('heading', { name: tree.name })).toBeVisible({ timeout: 10000 })
+      await expect(page.getByText(tree.name)).toBeVisible({ timeout: 10000 })
 
       // Start the session (no intake form on this flow)
       const startButton = page.getByRole('button', { name: /Start/ })