refactor(ux): consolidate BMAD skills, update design system, and clean up Prisma generated client

keep-notes/app/api/canvas/route.ts

@@ -0,0 +1,33 @@
+import { NextResponse } from 'next/server'
+import { prisma } from '@/lib/prisma'
+import { auth } from '@/auth'
+import { revalidatePath } from 'next/cache'
+
+export async function POST(req: Request) {
+  try {
+    const session = await auth()
+    if (!session?.user?.id) return NextResponse.json({ error: 'Unauthorized' }, { status: 401 })
+
+    const body = await req.json()
+    const { id, name, data } = body
+
+    if (id) {
+      const canvas = await prisma.canvas.update({
+        where: { id, userId: session.user.id },
+        data: { name, data }
+      })
+      return NextResponse.json({ success: true, canvas })
+    } else {
+      const canvas = await prisma.canvas.create({
+        data: {
+          name,
+          data,
+          userId: session.user.id
+        }
+      })
+      return NextResponse.json({ success: true, canvas })
+    }
+  } catch (error) {
+    return NextResponse.json({ error: 'Internal Server Error' }, { status: 500 })
+  }
+}