fix(desktop): bundle Node 22 for CodeGraph and update dmg download link

Embed Node 22.19 (node:sqlite) in desktop staging with version stamp
invalidation; refresh Baidu Netdisk URL and Gatekeeper workaround in README.

Co-authored-by: Cursor <cursoragent@cursor.com>

Author: heqikai

README.md

@@ -211,15 +211,15 @@ Roadmap and deferred work: [docs/codedelta/ROADMAP.md](docs/codedelta/ROADMAP.md
 
 ## Desktop (macOS)
 
-CodeDelta ships a **macOS desktop app** ([`apps/desktop/`](apps/desktop/)) — a Tauri 2 shell that bundles Node 20 and the API server. End users do not need a separate Node install.
+CodeDelta ships a **macOS desktop app** ([`apps/desktop/`](apps/desktop/)) — a Tauri 2 shell that bundles Node 22 (for CodeGraph’s `node:sqlite`) and the API server. End users do not need a separate Node install.
 
 ### Download (Apple Silicon)
 
 Pre-built **unsigned** `.dmg` (arm64 / M1–M4):
 
-- [百度网盘](https://pan.baidu.com/s/16DL3nvpFA9FR6UsskqoFyA?pwd=frog) · 提取码: `frog`
+- [百度网盘](https://pan.baidu.com/s/1FQxOgNHyvU1Y5EB34RpogQ?pwd=frog) · 提取码: `frog`
 
-Install: open the dmg → drag **CodeDelta** to Applications. If macOS blocks launch, right-click the app → **Open**. Requires **git** on `PATH`.
+Install: open the dmg → drag **CodeDelta** to Applications. If macOS blocks launch, right-click the app → **Open**, or run `xattr -cr /Applications/CodeDelta.app` (common after Baidu Netdisk download). Requires **git** on `PATH`.
 
 **Runtime data:** `~/Library/Application Support/CodeDelta` (repos, snapshots, settings).
 

docs/codedelta/ROADMAP.md

@@ -126,7 +126,7 @@ Not implemented yet (planned):
 
 - [x] `@codedelta/server` static UI hosting + `CODEDELTA_MONOREPO_ROOT`
 - [x] Web boot screen (`/api/health` polling, git banner)
-- [x] `scripts/desktop-stage.mjs` — embedded Node 20 + production runtime
+- [x] `scripts/desktop-stage.mjs` — embedded Node 22+ (`node:sqlite`) + production runtime
 - [x] `apps/desktop` Tauri 2 shell (spawn/kill API, single instance, `127.0.0.1:3847`)
 - [x] Import page recent repositories
 - [x] `npm run dev:desktop` / `stage:desktop` / `build:desktop`

packages/codedelta-server/src/services/compare.ts

@@ -70,7 +70,7 @@ export async function compareCommits(
     }
     if (err instanceof SnapshotEmptyError) {
       throw new CompareError(
-        'Repository produced an empty structural graph. This can happen when fallback extraction cannot parse the language yet. Please retry compare once; if it persists, use TS/JS repo or enable full CodeGraph extraction support for this language.',
+        'Repository produced an empty structural graph. CodeGraph indexing did not run or found no symbols, and the TS/JS fallback found no .ts/.js files. Retry once; on desktop ensure the bundled Node is 22.5+ (rebuild with npm run build:desktop). Python and other languages need CodeGraph, not fallback.',
         422,
       );
     }

scripts/desktop-stage.mjs

@@ -18,7 +18,8 @@ const APP_ROOT = path.join(RUNTIME_ROOT, 'app');
 const WEB_DIST = path.join(RUNTIME_ROOT, 'web-dist');
 const NODE_ROOT = path.join(RUNTIME_ROOT, 'node');
 
-const NODE_VERSION = process.env.CODEDELTA_NODE_VERSION ?? '20.19.2';
+// CodeGraph requires node:sqlite (Node.js 22.5+). Keep in sync with scripts/build-bundle.sh LTS line.
+const NODE_VERSION = process.env.CODEDELTA_NODE_VERSION ?? '22.19.0';
 const CODEDELTA_PACKAGES = [
   'codedelta-types',
   'codedelta-repo-manager',
@@ -97,10 +98,16 @@ async function ensureNodeBinary() {
   const tarName = `${base}.tar.gz`;
   const url = `https://nodejs.org/dist/v${NODE_VERSION}/${tarName}`;
   const nodeBin = path.join(NODE_ROOT, 'bin', 'node');
-  if (fs.existsSync(nodeBin)) {
-    log(`Reusing embedded Node at ${nodeBin}`);
+  const versionStamp = path.join(NODE_ROOT, '.node-version');
+  const stamped =
+    fs.existsSync(versionStamp) && fs.readFileSync(versionStamp, 'utf8').trim() === NODE_VERSION;
+  if (fs.existsSync(nodeBin) && stamped) {
+    log(`Reusing embedded Node ${NODE_VERSION} at ${nodeBin}`);
     return nodeBin;
   }
+  if (fs.existsSync(nodeBin)) {
+    log(`Embedded Node version changed — re-downloading ${NODE_VERSION}`);
+  }
   rmrf(NODE_ROOT);
   const tmpTar = path.join(RUNTIME_ROOT, tarName);
   fs.mkdirSync(RUNTIME_ROOT, { recursive: true });
@@ -112,6 +119,7 @@ async function ensureNodeBinary() {
   if (!fs.existsSync(nodeBin)) {
     throw new Error(`Node binary missing after extract: ${nodeBin}`);
   }
+  fs.writeFileSync(versionStamp, `${NODE_VERSION}\n`);
   return nodeBin;
 }
 
@@ -210,7 +218,18 @@ function sleep(ms) {
 }
 
 function smokeTest(nodeBin) {
-  log('Smoke test: CodeGraph load + health endpoint');
+  log('Smoke test: node:sqlite + CodeGraph load + health endpoint');
+  const sqliteCheck = spawnSync(
+    nodeBin,
+    ['-e', "const { DatabaseSync } = require('node:sqlite'); new DatabaseSync(':memory:').close()"],
+    { cwd: APP_ROOT, stdio: 'inherit' },
+  );
+  if (sqliteCheck.status !== 0) {
+    throw new Error(
+      'Embedded Node lacks node:sqlite (need Node 22.5+). Bump CODEDELTA_NODE_VERSION in desktop-stage.mjs',
+    );
+  }
+
   const cgCheck = spawnSync(
     nodeBin,
     ['-e', "const m=require('./dist/index.js'); if(!m.default&&!m.CodeGraph) process.exit(1)"],