Enhance editor UI and functionality with improved command palette and display settings

- Updated the command palette UI to include a search input with focus management, allowing users to filter and categorize commands more effectively.
- Enhanced the global search UI with tabbed results for recent files and labels, improving organization and accessibility.
- Refactored the display settings to be accessible via a popup, allowing customization without needing to load a ROM.
- Improved the welcome screen with enhanced particle effects and customization options, making it more visually appealing and user-friendly.
- Added functionality for global font scaling and theme management within the display settings, enhancing user experience.

src/app/gui/style.h

@@ -73,6 +73,7 @@ void SetupCanvasTableColumn(const char* label, float width_ratio = 0.0f);
 void BeginCanvasTableCell(ImVec2 min_size = ImVec2(0, 0));
 
 void DrawDisplaySettings(ImGuiStyle *ref = nullptr);
+void DrawDisplaySettingsForPopup(ImGuiStyle *ref = nullptr); // Popup-safe version
 
 void TextWithSeparators(const absl::string_view &text);