Revert spike ports to 3001/5173, add stories 32 and 33

Reverts port changes made during the spike back to default (3001/5173).
Adds two new stories for multi-worktree support: dynamic port management
(story 32) and worktree diff inspection with editor integration (story 33).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

frontend/vite.config.ts

@@ -5,9 +5,9 @@ import { defineConfig } from "vite";
 export default defineConfig(() => ({
   plugins: [react()],
   server: {
-    port: 5174,
+    port: 5173,
     proxy: {
-      "/api": "http://127.0.0.1:3002",
+      "/api": "http://127.0.0.1:3001",
     },
   },
   build: {