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/

src/scenes/TiledTestScene.js

@@ -202,6 +202,9 @@ class TiledTestScene extends Phaser.Scene {
     }
 
     update(time, delta) {
+        // Safety check - only run if cursors are initialized
+        if (!this.cursors) return;
+
         // Camera movement with arrow keys
         const speed = 10 / this.cameras.main.zoom; // Adjust speed based on zoom