ci: add GitHub Actions workflow for build, typecheck, and lint

Assisted-by: Claude Code
Signed-off-by: Avinal Kumar <avinal.xlvii@gmail.com>

.github/workflows/ci.yml

@@ -0,0 +1,23 @@
+name: CI
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-node@v4
+        with:
+          node-version: lts/*
+          cache: npm
+
+      - run: npm ci
+      - run: npm run build
+      - run: npm run typecheck
+      - run: npm run lint

package.json

@@ -5,10 +5,13 @@
   "description": "A browser extension for fuzzy searching tabs, history and bookmarks.",
   "scripts": {
     "build": "node build.mjs",
-    "watch": "node build.mjs --watch"
+    "watch": "node build.mjs --watch",
+    "typecheck": "tsc --noEmit",
+    "lint": "web-ext lint --source-dir . --warnings-as-errors=false"
   },
   "devDependencies": {
     "esbuild": "^0.25.0",
-    "typescript": "^5.8.0"
+    "typescript": "^5.8.0",
+    "web-ext": "^10.1.0"
   }
 }