feat: US-001 — scaffold NeuralDesk Electron + React app

- electron-forge 7 + Vite plugin (vite-typescript template)
- React 19 + TypeScript 5 strict mode
- TanStack Router with file-based routing (4 routes: /, /timeline, /tasks, /projects)
- Tailwind CSS 3 + PostCSS with Figma design tokens (sidebar, primary, muted)
- Framer Motion, Lucide React, shadcn/ui utilities (cn, CVA, clsx, twMerge)
- AppShell layout: 240px sidebar with collapse toggle, active route highlighting
- Vite configs use .mts extension to avoid ESM/CJS conflict with electron-forge
- Full package build verified (linux x64)

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

src/renderer/routes/__root.tsx

@@ -0,0 +1,10 @@
+import { createRootRoute, Outlet } from '@tanstack/react-router';
+import { AppShell } from '@/components/layout/AppShell';
+
+export const Route = createRootRoute({
+  component: () => (
+    <AppShell>
+      <Outlet />
+    </AppShell>
+  ),
+});

src/renderer/routes/index.tsx

@@ -0,0 +1,32 @@
+import { createFileRoute } from '@tanstack/react-router';
+
+export const Route = createFileRoute('/')({
+  component: HomePage,
+});
+
+function HomePage() {
+  return (
+    <div className="flex flex-col items-center justify-center h-full gap-4">
+      <div className="flex items-center gap-3">
+        <svg
+          width="24"
+          height="24"
+          viewBox="0 0 24 24"
+          fill="none"
+          className="text-foreground"
+        >
+          <path
+            d="M12 2L13.5 8.5L20 10L13.5 11.5L12 18L10.5 11.5L4 10L10.5 8.5L12 2Z"
+            fill="currentColor"
+          />
+        </svg>
+        <h1 className="text-3xl font-semibold tracking-tight">
+          Hello, Roberto
+        </h1>
+      </div>
+      <p className="text-muted-foreground text-sm">
+        NeuralDesk is ready. Start building.
+      </p>
+    </div>
+  );
+}

src/renderer/routes/projects.tsx

@@ -0,0 +1,13 @@
+import { createFileRoute } from '@tanstack/react-router';
+
+export const Route = createFileRoute('/projects')({
+  component: ProjectsPage,
+});
+
+function ProjectsPage() {
+  return (
+    <div className="flex items-center justify-center h-full text-muted-foreground text-sm">
+      Projects — coming in US-006
+    </div>
+  );
+}

src/renderer/routes/tasks.tsx

@@ -0,0 +1,13 @@
+import { createFileRoute } from '@tanstack/react-router';
+
+export const Route = createFileRoute('/tasks')({
+  component: TasksPage,
+});
+
+function TasksPage() {
+  return (
+    <div className="flex items-center justify-center h-full text-muted-foreground text-sm">
+      Tasks — coming in US-007
+    </div>
+  );
+}

src/renderer/routes/timeline.tsx

@@ -0,0 +1,13 @@
+import { createFileRoute } from '@tanstack/react-router';
+
+export const Route = createFileRoute('/timeline')({
+  component: TimelinePage,
+});
+
+function TimelinePage() {
+  return (
+    <div className="flex items-center justify-center h-full text-muted-foreground text-sm">
+      Timeline — coming in US-008
+    </div>
+  );
+}