VS Code CMake Helper: first implementation

CMake the way CLion does it (profiles and presets, targets, run and debug
configurations, CTest), moved out of personal-assistant's cmake-extension
and renamed from CMake Targets.

- Gitea Actions: typecheck, package the .vsix, release it on a v* tag
- Updates: the latest Gitea release is looked at every 10 minutes and
  offered for install; a private repository's token in the secret storage
- cmakeHelper.toolbar: the toolbar in the status bar, the editors' title,
  or VS Code's title bar (workbench.html patched, offered again after
  VS Code or extension updates)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

.gitea/workflows/build.yml

@@ -0,0 +1,53 @@
+name: Build
+
+on:
+  push:
+    branches: [main]
+    tags: ["v*"]
+  pull_request:
+    branches: [main]
+  workflow_dispatch:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: 22
+          cache: npm
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Typecheck
+        run: npm run typecheck
+
+      - name: Check tag matches package.json version
+        if: startsWith(github.ref, 'refs/tags/v')
+        run: |
+          pkg="v$(node -p 'require("./package.json").version')"
+          if [ "$pkg" != "${GITHUB_REF_NAME}" ]; then
+            echo "Tag ${GITHUB_REF_NAME} does not match package.json version $pkg"
+            exit 1
+          fi
+
+      - name: Package
+        run: npm run package -- --skip-license
+
+      # upload-artifact@v4 is not supported by older Gitea versions
+      - name: Upload artifact
+        uses: actions/upload-artifact@v3
+        with:
+          name: vsix
+          path: "*.vsix"
+
+      - name: Release
+        if: startsWith(github.ref, 'refs/tags/v')
+        uses: akkuman/gitea-release-action@v1
+        with:
+          files: "*.vsix"