feat(electron): add official icons and release workflow (#154)

* feat(electron): add app icons for Windows, macOS, and Linux releases

- icon.ico: Windows application icon (256x256 with multiple resolutions)
- icon.icns: macOS application icon bundle (16px to 1024px)
- icon.png: Linux/general purpose icon (512x512)
- tray-icon.png: System tray icon (32x32)

Icons generated from images/omniroute.png source logo.
Enables branded Electron desktop app builds for all platforms.

* chore: sync package-lock.json

* feat(electron): use official SVG logo and add release workflow

- Regenerated app icons from public/icon-192.svg (official OmniRoute logo)
- Added .github/workflows/electron-release.yml for automated builds
- Icons: icon.icns (macOS), icon.ico (Windows), icon.png (Linux), tray-icon.png
- Build workflow creates DMG (mac), EXE (win), AppImage (linux) on release

* ci: add npm cache to electron-release workflow

.github/workflows/electron-release.yml

@@ -0,0 +1,65 @@
+name: Build Electron Desktop App
+
+on:
+  release:
+    types: [published]
+
+permissions:
+  contents: write
+
+jobs:
+  build:
+    name: Build Electron (${{ matrix.os }})
+    runs-on: ${{ matrix.runner }}
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - os: windows
+            runner: windows-latest
+            target: win
+          - os: macos
+            runner: macos-latest
+            target: mac
+          - os: linux
+            runner: ubuntu-latest
+            target: linux
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v6
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v6
+        with:
+          node-version: 22
+          cache: npm
+
+      - name: Cache node_modules
+        uses: actions/cache@v4
+        with:
+          path: node_modules
+          key: ${{ runner.os }}-node-${{ hashFiles('package-lock.json') }}
+          restore-keys: |
+            ${{ runner.os }}-node-
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Build Next.js standalone
+        run: npm run build
+
+      - name: Install Electron dependencies
+        working-directory: electron
+        run: npm ci
+
+      - name: Build Electron for ${{ matrix.target }}
+        working-directory: electron
+        run: npm run build:${{ matrix.target }}
+
+      - name: Upload release assets
+        uses: softprops/action-gh-release@v2
+        with:
+          files: electron/dist-electron/**/*
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

.gitignore

@@ -105,3 +105,4 @@ app.__qa_backup/
 
 # Electron (subproject dependency lock)
 electron/package-lock.json
+icon.iconset/