add choice mechanic

GEMINI.md

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+# Visual Novel Dating Sim Editor
+
+A web-based editor for creating and previewing Visual Novel scripts with real-time feedback.
+
+## 🏗 Architecture
+
+- **Frontend**: Next.js (TypeScript) + Tailwind CSS.
+- **State Management**: React `useState` and `useEffect` in `app/page.tsx`.
+- **Script Engine**: Custom regex-based parser in `lib/vn-parser.ts`.
+- **Renderer**: Dynamic React component in `components/VNPreview.tsx` that reconstructs the scene state.
+- **Persistence**: 
+    - Automatic `localStorage` sync for current session.
+    - Script export/import as `.vns` files.
+    - Inline Base64 image embedding for portable project files.
+
+## 📝 Script Syntax
+
+### Basic Commands
+- `say Character "Dialogue"`: Display dialogue for a character.
+- `say "Dialogue"`: Narrator text.
+- `sprite Char Emotion at Position`: Place a character on screen.
+    - Positions: `pos1` to `pos8`.
+- `wait 2s`: Pause for duration (can add `skippable`).
+- `label Name`: Define a jump point.
+- `choice "Text" jump:Label`: Create a branching choice.
+- `define_sprite Char ID "URL"`: Register a sprite asset.
+
+### Rich Text Modifiers
+- `b"Bold"`
+- `i"Italic"`
+- `u"Underline"`
+- `c"Red"(c:red)`
+- `w"Wait"(w:1s)`
+
+## 🚀 Production Deployment
+
+### Docker (Recommended)
+The project is optimized for Docker using Next.js standalone output.
+
+```bash
+# Build the image
+docker build -t vn-editor .
+
+# Run the container
+docker run -p 3000:3000 vn-editor
+```
+
+### Manual Build
+```bash
+npm install
+npm run build
+npm run start
+```