feat: UI v2 overhaul — sidebar redesign, message layouts, session graph, resume-in-terminal

package.json

@@ -28,7 +28,6 @@
     "lint": "eslint"
   },
   "dependencies": {
-    "@xyflow/react": "^12.10.1",
     "highlight.js": "^11.11.1",
     "marked": "^17.0.3",
     "next": "16.1.6",

src/app/api/sessions/[sessionId]/permanent-delete/route.ts

@@ -0,0 +1,31 @@
+import { NextRequest, NextResponse } from "next/server";
+import fs from "fs/promises";
+import path from "path";
+
+export async function DELETE(
+  req: NextRequest,
+  { params }: { params: Promise<{ sessionId: string }> }
+) {
+  const { sessionId } = await params;
+  const body = await req.json().catch(() => ({}));
+  const filePath = body.filePath as string | undefined;
+
+  if (!filePath) {
+    return NextResponse.json({ error: "filePath required" }, { status: 400 });
+  }
+
+  if (!filePath.includes(sessionId)) {
+    return NextResponse.json({ error: "session/path mismatch" }, { status: 400 });
+  }
+
+  // The file should be in .trash/ — permanently remove it
+  const trashPath = path.join(path.dirname(filePath), ".trash", path.basename(filePath));
+
+  try {
+    await fs.rm(trashPath, { force: true });
+    return NextResponse.json({ ok: true });
+  } catch {
+    // Maybe file was already removed or never existed in trash
+    return NextResponse.json({ ok: true });
+  }
+}