Add maze generation visualization with 2-phase animation

Enhance maze generation animation system with visual feedback during algorithm execution and a two-phase rendering approach:

- Phase 1: Preview mode displays simple blocks while algorithms run, with real-time feedback for path checking (valid/invalid/evaluating states)
- Phase 2: Sweep 3D modular pieces into place with pop-in animations

Updates:
- New MazeCellHighlight states (EvaluatingValid, EvaluatingInvalid) for algorithm feedback
- Modified all maze algorithms (DFS, Kruskal's, Prim's) to emit visual feedback when checking adjacent cells
- New animation components: HighlightLinger (self-destruct highlights) and PopInAnimation (juicy pop-in effect)
- Refactored MazeReworkSpawner to support preview prefabs and track spawned object state
- New prefabs: Stair room and MazeVisualize variants
- Added stepDelay and isPreviewMode controls to MazeAnimator for flexible pacing
- Reduced default maze size and adjusted material colors for testing

Assets/Prefabs/Environment/Hall/MazeVisualize.prefab

@@ -29,8 +29,8 @@ Transform:
   serializedVersion: 2
   m_LocalRotation: {x: 0, y: 0, z: 0, w: 1}
   m_LocalPosition: {x: 111.06352, y: 0.99998, z: 75.67667}
-  m_LocalScale: {x: 1, y: 1, z: 1}
-  m_ConstrainProportionsScale: 0
+  m_LocalScale: {x: 10, y: 10, z: 10}
+  m_ConstrainProportionsScale: 1
   m_Children: []
   m_Father: {fileID: 0}
   m_LocalEulerAnglesHint: {x: 0, y: 0, z: 0}