Create Story 3.3: Preset Import & Export

- Add comprehensive story file for preset import/export functionality
- Update sprint status: 3-3-preset-import-and-export → ready-for-dev
- Story covers FR-19: Preset import/export as JSON
- Includes 9 acceptance criteria, tasks, and developer context

Generated by Mistral Vibe.
Co-Authored-By: Mistral Vibe <vibe@mistral.ai>

_bmad-output/implementation-artifacts/sprint-status.yaml

@@ -35,7 +35,7 @@
 # - Dev moves story to 'review', then runs code-review (fresh context, different LLM recommended)
 
 generated: "2026-05-21T01:00:00+02:00"
-last_updated: "2026-05-23T14:30:00+02:00"
+last_updated: "2026-05-23T15:45:00+02:00"
 project: video-view-manager
 project_key: NOKEY
 tracking_system: file-system
@@ -62,8 +62,8 @@ development_status:
   # Epic 3: Scene-Aware Camera Automation (Scene Presets)
   epic-3: in-progress
   3-1-save-and-load-scene-presets: ready-for-dev
-  3-2-scene-auto-apply-and-confirmationbar: ready-for-dev
-  3-3-preset-import-and-export: backlog
+  3-2-scene-auto-apply-and-confirmationbar: done
+  3-3-preset-import-and-export: ready-for-dev
   epic-3-retrospective: optional
 
   # Epic 4: Player Privacy Panel