Tiled Map Editor Exploration + Bug Fixes

Tiled Setup:
- Installed Tiled v1.11.2 (winget)
- Created workflow documentation (.agent/workflows/tiled-map-setup.md)
- Generated demo Tiled map files (farm_map.tmx, .json, .tsx)
- Created TILED_INTEGRATION_STATUS.md documentation

 Bug Fixes:
- SaveSystem.js: Fixed compatibility with Flat2DTerrainSystem
- InteractionSystem.js: Added null checks for terrainSystem
- PreloadScene.js: Tiled asset loading (currently not used)

 Documentation:
- Created DNEVNIK.md (development diary)
- Updated QUICK_TASK_REFERENCE.md with recent work

 Note: Tiled integration incomplete (tileset size issues)
- Reverted to procedural Flat2DTerrainSystem (working)
- Future work: Create proper 192x192 tileset PNGs

Session: 2h (20:00-22:00)
Date: 14.12.2024

assets/tilesets/grass_tileset.tsx

@@ -0,0 +1,4 @@
+<? xml version = "1.0" encoding = "UTF-8" ?>
+    <tileset version="1.10" tiledversion="1.11.0" name="grass_tileset" tilewidth="48" tileheight="48" tilecount="16" columns="4">
+        <image source="tileset_grass_clean.png" width="192" height="192" />
+    </tileset>