Merge main into refactor/frontend

Merge latest features from main including:
- PR #161 (worktree-confusion): Clarified branch handling in dialogs
- PR #160 (speckits-rebase): Planning mode functionality

Resolved conflicts:
- add-feature-dialog.tsx: Combined TanStack Router navigation with branch selection state
- worktree-integration.spec.ts: Updated tests for new worktree behavior (created at execution time)
- package-lock.json: Regenerated after merge

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

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

apps/ui/playwright.config.ts

@@ -3,14 +3,15 @@ import { defineConfig, devices } from "@playwright/test";
 const port = process.env.TEST_PORT || 5173;
 const serverPort = process.env.TEST_SERVER_PORT || 3008;
 const reuseServer = process.env.TEST_REUSE_SERVER === "true";
-const mockAgent = process.env.CI === "true" || process.env.AUTOMAKER_MOCK_AGENT === "true";
+const mockAgent =
+  process.env.CI === "true" || process.env.AUTOMAKER_MOCK_AGENT === "true";
 
 export default defineConfig({
   testDir: "./tests",
   fullyParallel: true,
   forbidOnly: !!process.env.CI,
   retries: process.env.CI ? 2 : 0,
-  workers: process.env.CI ? 1 : undefined,
+  workers: undefined,
   reporter: "html",
   timeout: 30000,
   use: {