Convert Windows app to Electron and add Android Capacitor app with CI builds

android-app/README.md

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+# Android App (Capacitor)
+
+This folder contains the Android app build for the project. The app reuses the existing web UI (apps and builder screens) and wraps it with Capacitor for native Android deployment.
+
+## Goals
+- Reuse the existing web UI with minimal divergence.
+- Provide a native Android APK for distribution.
+- Sync apps between device and backend.
+- Build via GitHub Actions; do not build locally.
+
+## How it works
+- **UI reuse:** `npm run prepare-ui` copies `../chat/public` into `www` and injects a bridge script so existing pages can talk to native APIs.
+- **Native bridge:** Capacitor provides native access to preferences and HTTP requests.
+- **Local storage:** Apps are saved using Capacitor Preferences plugin, isolated per user.
+- **Syncing:** `syncApp` posts the locally saved app JSON to the backend.
+
+## Setup
+1. Install prerequisites (Node 18+, Android SDK).
+2. From this folder: `npm install`.
+3. Pull UI assets: `npm run prepare-ui`.
+4. Add Android platform: `npx cap add android`.
+5. Sync: `npx cap sync android`.
+
+## Development
+- `npm run build` prepares UI and syncs with Android.
+- `npx cap open android` opens Android Studio for development.
+
+## CI build
+- GitHub Actions workflow: `.github/workflows/build-android-app.yml`.
+- The action runs on `ubuntu-latest`, sets up Java/Android SDK, and builds the APK.
+
+## Security notes
+- API keys are stored in Capacitor Preferences (encrypted on Android).
+- OpenCode execution is not supported on mobile (desktop app only).