refactor: extract dashboard, workspace, tool-types, and tool-configs components (Task 4.3)

- Extract DashboardSummary, ActiveSessionsList, ProjectsSection, QuickCreateForm,
  RecentSessionsSection from dashboard.tsx (480 → 110 lines)
- Extract WorkspaceSidebar from repo-workspace.tsx
- Extract ToolTypeList + ToolTypeForm from tool-types.tsx (409 → 135 lines)
- Extract ToolConfigList + ToolConfigForm from tool-configs.tsx (391 → 178 lines)
- Add use-dashboard-actions hook for shared dashboard action handlers
- Update feature barrels with new exports

Quality gates: tsc (pass), eslint (pass)
Refs: repo-restructure Task 4.3

apps/web/vite.config.ts

@@ -1,8 +1,14 @@
+import path from "path";
 import { defineConfig } from "vite";
 import react from "@vitejs/plugin-react";
 
 export default defineConfig({
   plugins: [react()],
+  resolve: {
+    alias: {
+      "@": path.resolve(__dirname, "./src"),
+    },
+  },
   server: {
     port: 5173
   },