feat: Tiled Map Editor setup and initial farm map design

- Installed and configured Tiled Map Editor
- Created 4 tilesets (grass, water, dirt, decorations)
- Generated farm_2d.tmx (100x100 orthogonal map)
- Created 4 render layers (Ground, Paths, Decorations, DecorationsTall)
- Painted grass base layer across entire map
- Added dirt path network
- Placed decorative elements (trees, flowers, rocks)
- Recovered and fixed tileset PNG images
- Updated 2D_CONVERSION_LOG.md with Phase 5 completion (85% done)

Next: Export to JSON and integrate into Phaser game

assets/tilesets/decorations_tiles.tsx

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<tileset version="1.10" tiledversion="1.11.2" name="decorations_tiles" tilewidth="48" tileheight="48" tilecount="441" columns="21">
+ <image source="decorations.png" width="1024" height="1024"/>
+</tileset>