Shadow Stitcher

### Project slug (e.g., snake, todo)

_No response_

### Summary

Connect drifting shadow blobs with a single continuous line. Don’t let your drawn path cross itself!

**Acceptance Criteria:**

- Randomly spawned circular “shadow blobs”.

- Player draws with mouse.

- Crossing your own line resets the game.

**Optional Enhancements:**

- Blobs slowly drift for dynamic difficulty.

- Visual glow along the drawn line.

### Details / Acceptance criteria

_No response_

### Scope

- [ ] UI changes
- [ ] Logic changes
- [ ] Accessibility
- [ ] Tests (manual)