Green Background Removal + TSX Generation + Bug Fixes

Removed green backgrounds from 30 tileset PNGs (16.4M pixels!)
 Created mass TSX generation script for 3877 individual objects
 Fixed TiledTestScene cursor crash bug
 Added micro_farm_8x8 JSON loading support
 Documentation: GREEN_BACKGROUND_FIX.md, MASS_TSX_GENERATION.md

Scripts:
- scripts/remove_green_background.py (batch transparency fix)
- scripts/generate_mass_tsx.py (3877 .tsx files generator)

Backups: assets/tilesets/backup_green_bg/

assets/tilesets/backup_green_bg/README.md

@@ -0,0 +1,37 @@
+# Backup - Original Files with Green Background
+
+**Created**: 2025-12-22, 10:50  
+**Reason**: Batch green background removal
+
+---
+
+## 📁 WHAT'S IN THIS FOLDER?
+
+This folder contains **ORIGINAL VERSIONS** of all tileset PNG files **BEFORE** the green background was removed.
+
+All files here have bright green (#00FF00) backgrounds instead of transparency.
+
+---
+
+## 🔄 HOW TO RESTORE
+
+If you need to restore any original file:
+
+1. **Copy** the file from this backup folder
+2. **Paste** to `c:\novafarma\assets\tilesets\`
+3. **Overwrite** the current file
+
+---
+
+## ⚠️ DO NOT DELETE
+
+Keep this folder as a safety backup in case:
+- Something went wrong with the conversion
+- You need the original green background files
+- You want to re-process with different settings
+
+---
+
+**Backup of**: 30 PNG files  
+**Total size**: ~15 MB  
+**Script used**: `scripts/remove_green_background.py`