feat: add command palette, accessibility, scroll animations, demo workspace, and keyboard navigation

- COMP-139: Command palette for quick navigation
- COMP-140: Accessibility improvements
- COMP-141: Scroll animations with animate-on-scroll component
- COMP-143: Demo workspace with seed data and demo banner
- COMP-145: Keyboard navigation and shortcuts help

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-Claude)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

apps/web/src/app/api/demo/seed/route.ts

@@ -0,0 +1,33 @@
+import { NextResponse } from "next/server";
+import { auth } from "@/auth";
+import { prisma } from "@/lib/prisma";
+import { seedDemoData } from "@/lib/demo-data";
+
+export async function POST() {
+  try {
+    const session = await auth();
+    if (!session?.user?.id) {
+      return NextResponse.json({ error: "Unauthorized" }, { status: 401 });
+    }
+
+    const user = await prisma.user.findUnique({
+      where: { id: session.user.id },
+      select: { demoSeeded: true },
+    });
+
+    if (!user) {
+      return NextResponse.json({ error: "User not found" }, { status: 404 });
+    }
+
+    if (user.demoSeeded) {
+      return NextResponse.json({ error: "Demo data already seeded" }, { status: 409 });
+    }
+
+    await seedDemoData(session.user.id);
+
+    return NextResponse.json({ success: true }, { status: 200 });
+  } catch (error) {
+    console.error("Error seeding demo data:", error);
+    return NextResponse.json({ error: "Internal server error" }, { status: 500 });
+  }
+}