fix: CI release workflow — remove broken dashboard build, fix macos runner

- Remove pnpm dashboard build step from release.yml and ci.yml
  (dashboard build output is committed to git, embedded via include_dir!)
- Fix macos-13 → macos-14 (macos-13 runners deprecated)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.github/workflows/release.yml

@@ -30,7 +30,7 @@ jobs:
             os: windows-latest
             archive: zip
           - target: x86_64-apple-darwin
-            os: macos-13
+            os: macos-14
             archive: tar.gz
           - target: aarch64-apple-darwin
             os: macos-latest
@@ -40,21 +40,6 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v4
 
-      - name: Install pnpm
-        uses: pnpm/action-setup@v4
-        with:
-          version: 10
-
-      - name: Install Node.js
-        uses: actions/setup-node@v4
-        with:
-          node-version: 22
-
-      - name: Build dashboard
-        run: |
-          pnpm install --frozen-lockfile
-          pnpm --filter dashboard build
-
       - name: Install Rust
         uses: dtolnay/rust-toolchain@stable
         with: