feat: Electrobun Svelte+WGPU prototype (Dawn GPU confirmed on Linux)

- Svelte 5 frontend with Catppuccin Mocha theme, 2 project cards
- Electrobun v1.16.0 with bundleWGPU: true (Dawn on Linux x64)
- WebKitGTK webview + WGPU surface coexistence confirmed
- CPU: 6.5% idle (CSS animation + WebKitGTK overhead)
- Port 9760 for dev server (project convention)

ui-electrobun/README.md

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+# Svelte Electrobun Template
+
+A fast Electrobun desktop app template with Svelte 5 and Vite for hot module replacement (HMR).
+
+## Getting Started
+
+```bash
+# Install dependencies
+bun install
+
+# Development without HMR (uses bundled assets)
+bun run dev
+
+# Development with HMR (recommended)
+bun run dev:hmr
+
+# Build for production
+bun run build
+
+# Build for production release
+bun run build:prod
+```
+
+## How HMR Works
+
+When you run `bun run dev:hmr`:
+
+1. **Vite dev server** starts on `http://localhost:5173` with HMR enabled
+2. **Electrobun** starts and detects the running Vite server
+3. The app loads from the Vite dev server instead of bundled assets
+4. Changes to Svelte components update instantly without full page reload
+
+When you run `bun run dev` (without HMR):
+
+1. Electrobun starts and loads from `views://mainview/index.html`
+2. You need to rebuild (`bun run build`) to see changes
+
+## Project Structure
+
+```
+├── src/
+│   ├── bun/
+│   │   └── index.ts        # Main process (Electrobun/Bun)
+│   └── mainview/
+│       ├── App.svelte      # Svelte app component
+│       ├── main.ts         # Svelte entry point
+│       ├── index.html      # HTML template
+│       └── app.css         # Global styles
+├── electrobun.config.ts    # Electrobun configuration
+├── vite.config.ts          # Vite configuration
+├── svelte.config.js        # Svelte configuration
+└── package.json
+```
+
+## Svelte 5 Features
+
+This template uses Svelte 5 with the new runes syntax:
+
+- `$state()` - reactive state
+- `$derived()` - computed values
+- `$effect()` - side effects
+
+## Customizing
+
+- **Svelte components**: Edit files in `src/mainview/`
+- **Global styles**: Edit `src/mainview/app.css`
+- **Vite settings**: Edit `vite.config.ts`
+- **Window settings**: Edit `src/bun/index.ts`
+- **App metadata**: Edit `electrobun.config.ts`