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/flowpilot-chat.spec.ts

@@ -7,8 +7,8 @@ test.describe('FlowPilot assistant chat smoke tests', () => {
     // Should load the assistant chat page — UI shows "AI Assistant" heading
     await expect(page.getByText('AI Assistant')).toBeVisible({ timeout: 10000 })
 
-    // Should show the start conversation button when no chats exist
-    await expect(page.getByRole('button', { name: /Start a Conversation/i })).toBeVisible()
+    // Should show the start conversation button or new chat button
+    await expect(page.getByText('Start a Conversation')).toBeVisible()
   })
 
   test('can create a new chat session', async ({ page }) => {
@@ -16,15 +16,9 @@ test.describe('FlowPilot assistant chat smoke tests', () => {
     await expect(page.getByText('AI Assistant')).toBeVisible({ timeout: 10000 })
 
     // Click "New Chat" button in the sidebar
-    const newChatButton = page.getByRole('button', { name: /New Chat/i })
-    await expect(newChatButton).toBeVisible()
-    await newChatButton.click()
+    await page.getByText('New Chat').click()
 
-    // After creating a chat, the message input area should appear
-    // The textarea may use various placeholders
-    const messageInput = page.locator('textarea').first()
-    await expect(messageInput).toBeVisible({ timeout: 5000 })
+    // After creating a chat, a textarea or input should appear for messaging
+    await expect(page.locator('textarea').first()).toBeVisible({ timeout: 5000 })
   })
-
-  // Note: Full AI response tests require ANTHROPIC_API_KEY in the environment.
 })