Fix Setting.gd Vector2/Window API, re-import all assets for Godot 4

- apply_resolution: Vector2 strings -> Vector2i(int, int); use
  Window.content_scale_size instead of removed
  Viewport.set_size_2d_override variants.
- Re-import 162 assets to Godot 4 format (.godot/imported/ now,
  .stex -> .ctex, FontFile, CompressedTexture2D, etc.).
- Add .uid sidecars Godot 4 generates next to every script.
- Ignore .godot/ cache and android/ template directories.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

.gitignore

@@ -3,8 +3,15 @@
 
 ### Godot ###
 
-# Godot-specific ignores
+# Godot 3.x cache directory (replaced by .godot/ in Godot 4.x)
 .import/
+
+# Godot 4.x project cache (re-generated on open; do not commit)
+.godot/
+
+# Android build template directory generated by the editor
+android/
+
 export.cfg
 
 # Imported translations (automatically generated from CSV files)