feat: add cross-platform release pipeline and app icons

- Update tauri.conf.json with multi-platform bundle config (macOS unsigned, Windows unsigned)
- Add app icon (1024x1024 source) and generate all required sizes (png, icns, ico)
- Add generate-icons.sh script for regenerating icons from source PNG
- Add GitHub Actions release workflow for 4-target parallel builds (macOS ARM/x64, Linux, Windows)
- Simplify release.sh with tag-based publish instructions

Generated with [Claude Code](https://claude.ai/code)
via [Happy](https://happy.engineering)

Co-Authored-By: Claude <noreply@anthropic.com>
Co-Authored-By: Happy <yesreply@happy.engineering>

.github/workflows/release.yml

@@ -0,0 +1,92 @@
+name: Release
+
+on:
+  push:
+    tags: ['v*']
+
+permissions:
+  contents: write
+
+jobs:
+  build:
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - platform: macos-latest
+            target: aarch64-apple-darwin
+            label: macOS-ARM64
+          - platform: macos-latest
+            target: x86_64-apple-darwin
+            label: macOS-x64
+          - platform: ubuntu-22.04
+            target: x86_64-unknown-linux-gnu
+            label: Linux-x64
+          - platform: windows-latest
+            target: x86_64-pc-windows-msvc
+            label: Windows-x64
+
+    runs-on: ${{ matrix.platform }}
+    name: Build (${{ matrix.label }})
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: 20
+          cache: npm
+
+      - name: Setup Rust
+        uses: dtolnay/rust-toolchain@stable
+        with:
+          targets: ${{ matrix.target }}
+
+      - name: Rust cache
+        uses: swatinem/rust-cache@v2
+        with:
+          workspaces: src-tauri
+
+      - name: Install Linux dependencies
+        if: matrix.platform == 'ubuntu-22.04'
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y \
+            libwebkit2gtk-4.1-dev \
+            libappindicator3-dev \
+            librsvg2-dev \
+            patchelf
+
+      - name: Install frontend dependencies
+        run: npm ci
+
+      - name: Build Tauri app
+        uses: tauri-apps/tauri-action@v0
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          TAURI_SIGNING_PRIVATE_KEY: ''
+        with:
+          tagName: ${{ github.ref_name }}
+          releaseName: ClawPal ${{ github.ref_name }}
+          releaseBody: |
+            ## ClawPal ${{ github.ref_name }}
+
+            ### Installation
+
+            **macOS** (unsigned — requires manual approval):
+            - Download the `.dmg` for your architecture (ARM for Apple Silicon, x64 for Intel)
+            - Open the DMG and drag ClawPal to Applications
+            - First launch: right-click the app → Open, or run `xattr -cr /Applications/ClawPal.app`
+
+            **Windows** (unsigned — SmartScreen will warn):
+            - Download the `.exe` (NSIS installer) or `.msi`
+            - If SmartScreen blocks: click "More info" → "Run anyway"
+
+            **Linux**:
+            - `.deb`: `sudo dpkg -i clawpal_*.deb`
+            - `.AppImage`: `chmod +x ClawPal_*.AppImage && ./ClawPal_*.AppImage`
+          releaseDraft: true
+          prerelease: false
+          args: --target ${{ matrix.target }}