Add clone support for scene presets and update TODO

- Add clone_preset() to ScenePresetStore with deep copy of target snapshots
- Add POST /scene-presets/{id}/clone API endpoint
- Add clone button to scene preset cards in Automations tab
- Add i18n keys for clone feedback in all 3 locales
- Add TODO items for dashboard stats collapse and protocol badge review

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

TODO.md

@@ -59,3 +59,5 @@ Priority: `P1` quick win · `P2` moderate · `P3` large effort
   - Complexity: medium — new `tags: List[str]` field on all card entities; tag CRUD API; filter bar UI per section; tag badge rendering on cards; persistence migration
   - Impact: medium-high — essential for setups with many devices/targets; enables quick filtering (e.g. "bedroom", "desk", "gaming")
 - [x] `P3` **PWA / mobile layout** — Mobile-first layout + "Add to Home Screen" manifest
+- [ ] `P1` **Collapse dashboard running target stats** — Show only FPS chart by default; uptime, errors, and pipeline timings in an expandable section collapsed by default
+- [ ] `P1` **Review protocol badge on LED target cards** — Review and improve the protocol badge display on LED target cards