- Remove redundant `GameFlowScene` and `PlaceholderEncounterScene` - Introduce `SceneKey` enum for type-safe scene management - Clean up unused imports and configuration references in existing scenes - Standardize scene navigation using `SceneKey`
- Remove redundant `GameFlowScene` and `PlaceholderEncounterScene` - Introduce `SceneKey` enum for type-safe scene management - Clean up unused imports and configuration references in existing scenes - Standardize scene navigation using `SceneKey`