ci: add push/PR workflow (typecheck, unit tests, build)

Co-Authored-By: Claude

.gitea/workflows/ci.yml

@@ -0,0 +1,34 @@
+name: CI
+
+# Lightweight continuous integration: typecheck, unit tests, and build on
+# every push and pull request. (The Obsidian/Playwright E2E smoke is not run
+# here — it needs a real Obsidian binary + virtual display; run it locally
+# via `npm run e2e`.)
+on:
+  push:
+    branches: [main]
+  pull_request:
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Node
+        uses: actions/setup-node@v4
+        with:
+          node-version: "20"
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Typecheck
+        run: npx tsc -noEmit -skipLibCheck
+
+      - name: Unit tests
+        run: npm test
+
+      - name: Build
+        run: npm run build