Add automated tests and CI coverage

Author: liuup

.github/workflows/ci.yml

@@ -0,0 +1,60 @@
+name: Test
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+
+permissions:
+  contents: read
+
+jobs:
+  frontend:
+    name: Frontend tests
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v6
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v6
+        with:
+          node-version: 20
+          cache: npm
+
+      - name: Install frontend dependencies
+        run: npm ci
+
+      - name: Run frontend tests
+        run: npm run test
+
+      - name: Build frontend
+        run: npm run build
+
+  backend:
+    name: Backend tests
+    runs-on: ubuntu-24.04
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v6
+
+      - name: Setup Rust
+        uses: dtolnay/rust-toolchain@stable
+
+      - name: Install Linux build dependencies
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y \
+            libwebkit2gtk-4.1-dev \
+            libjavascriptcoregtk-4.1-dev \
+            libgtk-3-dev \
+            libayatana-appindicator3-dev \
+            librsvg2-dev \
+            build-essential \
+            pkg-config
+
+      - name: Run Rust tests
+        run: cargo test --manifest-path src-tauri/Cargo.toml