Add Overworld accessors and enhance testing framework

- Introduced new methods in `Controller`, `EditorManager`, and `OverworldEditor` to access the `Overworld` instance, improving modularity and interaction with the overworld data.
- Added `GetTile` method in `Overworld` to retrieve tile data based on coordinates, enhancing functionality for tile manipulation.
- Implemented a new testing framework with automated GUI tests, including `CanvasSelectionTest` and `FrameworkSmokeTest`, to validate user interactions and ensure robustness.
- Updated `CMakeLists.txt` to include new test files and dependencies, streamlining the build process for testing.
- Refactored logging behavior to ensure proper file handling during logging operations, improving reliability in logging outputs.

src/app/editor/editor_manager.h

@@ -101,6 +101,7 @@ class EditorManager {
   absl::Status SetCurrentRom(Rom* rom);
   auto GetCurrentRom() -> Rom* { return current_rom_; }
   auto GetCurrentEditorSet() -> EditorSet* { return current_editor_set_; }
+  auto overworld() -> yaze::zelda3::Overworld* { return &current_editor_set_->overworld_editor_.overworld(); }
 
   // Get current session's feature flags (falls back to global if no session)
   core::FeatureFlags::Flags* GetCurrentFeatureFlags() {