ci: add GitHub Actions workflow

- Frontend: type-check + build (ubuntu-latest)
- Rust: cargo check + clippy (ubuntu-latest)
- Tauri build: Windows (MSVC) + Linux, on push to main
- Upload build artifacts
- rust-toolchain.toml for consistent Rust version

.github/workflows/ci.yml

@@ -0,0 +1,111 @@
+name: CI
+
+on:
+  push:
+    branches: [main]
+    paths-ignore:
+      - '**.md'
+      - '.gitignore'
+  pull_request:
+    branches: [main]
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  # ─── Frontend: lint + type-check + build ──────────────────────
+  frontend:
+    name: Frontend
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: pnpm/action-setup@v4
+        with:
+          version: 9
+
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 22
+          cache: pnpm
+
+      - run: pnpm install --frozen-lockfile
+
+      - name: Type check
+        run: npx vue-tsc --noEmit
+
+      - name: Build
+        run: pnpm build
+
+  # ─── Rust: check + clippy ─────────────────────────────────────
+  rust:
+    name: Rust
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions-rust-lang/setup-rust-toolchain@v1
+        with:
+          target: x86_64-unknown-linux-gnu
+
+      - name: Install system deps
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y libwebkit2gtk-4.1-dev libappindicator3-dev \
+            librsvg2-dev patchelf libgtk-3-dev libsoup-3.0-dev libjavascriptcoregtk-4.1-dev
+
+      - name: Check
+        run: cargo check --manifest-path src-tauri/Cargo.toml
+
+      - name: Clippy
+        run: cargo clippy --manifest-path src-tauri/Cargo.toml -- -D warnings
+
+  # ─── Tauri build (Windows) ────────────────────────────────────
+  tauri-build:
+    name: Tauri Build
+    needs: [frontend, rust]
+    if: github.event_name == 'push' && github.ref == 'refs/heads/main'
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - os: windows-latest
+            target: x86_64-pc-windows-msvc
+          - os: ubuntu-latest
+            target: x86_64-unknown-linux-gnu
+
+    runs-on: ${{ matrix.os }}
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: pnpm/action-setup@v4
+        with:
+          version: 9
+
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 22
+          cache: pnpm
+
+      - uses: actions-rust-lang/setup-rust-toolchain@v1
+        with:
+          target: ${{ matrix.target }}
+
+      - name: Install Linux deps
+        if: matrix.os == 'ubuntu-latest'
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y libwebkit2gtk-4.1-dev libappindicator3-dev \
+            librsvg2-dev patchelf libgtk-3-dev libsoup-3.0-dev libjavascriptcoregtk-4.1-dev
+
+      - run: pnpm install --frozen-lockfile
+
+      - name: Build Tauri app
+        run: pnpm tauri build --target ${{ matrix.target }}
+
+      - name: Upload artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: mqttx-${{ runner.os }}
+          path: src-tauri/target/release/bundle/

rust-toolchain.toml

@@ -0,0 +1,6 @@
+[toolchain]
+channel = "stable"
+targets = [
+  "x86_64-pc-windows-msvc",
+  "x86_64-unknown-linux-gnu",
+]