Initial commit with Phase 0 Scaffolding

frontend/src/pages/HomePage.tsx

@@ -0,0 +1,61 @@
+/**
+ * Home page — recently edited, library, and trash tabs.
+ * Full implementation in Phase 1.
+ */
+export function HomePage() {
+  return (
+    <div className="min-h-screen bg-neutral-50">
+      {/* Header */}
+      <header className="border-b border-neutral-200 bg-white">
+        <div className="mx-auto flex max-w-7xl items-center justify-between px-6 py-4">
+          <h1 className="text-xl font-semibold text-neutral-900">PaperJet</h1>
+          <button
+            type="button"
+            className="rounded-lg bg-accent-500 px-4 py-2 text-sm font-medium text-white
+                       transition-colors duration-150 hover:bg-accent-600"
+          >
+            Upload PDF
+          </button>
+        </div>
+      </header>
+
+      {/* Main content */}
+      <main className="mx-auto max-w-7xl px-6 py-8">
+        {/* Tab navigation */}
+        <nav className="mb-8 flex gap-1 rounded-lg bg-neutral-100 p-1">
+          <button
+            type="button"
+            className="rounded-md bg-white px-4 py-2 text-sm font-medium text-neutral-900
+                       shadow-sm transition-colors"
+          >
+            Recently Edited
+          </button>
+          <button
+            type="button"
+            className="rounded-md px-4 py-2 text-sm font-medium text-neutral-500
+                       transition-colors hover:text-neutral-700"
+          >
+            Library
+          </button>
+          <button
+            type="button"
+            className="rounded-md px-4 py-2 text-sm font-medium text-neutral-500
+                       transition-colors hover:text-neutral-700"
+          >
+            Trash
+          </button>
+        </nav>
+
+        {/* Empty state placeholder */}
+        <div className="flex flex-col items-center justify-center rounded-xl border-2 border-dashed
+                        border-neutral-300 py-20 text-center">
+          <div className="mb-4 text-5xl">📄</div>
+          <h2 className="text-lg font-medium text-neutral-700">No documents yet</h2>
+          <p className="mt-1 text-sm text-neutral-500">
+            Upload a PDF to get started
+          </p>
+        </div>
+      </main>
+    </div>
+  )
+}