## 1. Implementation
- [x] 1.1 Add `min-height: 0` to `.chat-panel-content` in `LaunchView.vue`
- [x] 1.2 Add `min-height: 0` to `.chat-box` in `LaunchView.vue`

## 2. Verification
- [x] 2.1 Run `openspec validate fix-fullscreen-chat-scroll --strict --no-interactive`
- [ ] 2.2 Manual visual test: open app, verify fullscreen chat scrolls when messages overflow