Theme system overhaul, UI polish, and VS2022 Dark theme

- Replaced hardcoded theme factories with JSON files + CMake build step
- Shared ThemeFieldMeta table for DRY serialization and editor UI
- Fixed live preview (auto-triggers on color change, no toggle button)
- Fixed duplicate theme entries when editing built-in themes
- Moved title bar from icon to bold "Reclass" text with View > Show Icon toggle
- MDI tabs: 24px height, unicode close button styled like TypeSelectorPopup
- Added VS2022 Dark theme with purple accent colors
- Status bar padding, removed monospace font overrides on tabs/statusbar
- Default startup opens Ball demo + Unnamed hex64 tabs

src/resources.qrc

@@ -3,6 +3,7 @@
         <file alias="chevron-right.png">icons/chevron-right.png</file>
         <file alias="chevron-down.png">icons/chevron-down.png</file>
         <file alias="class.png">icons/class.png</file>
+
     </qresource>
     <qresource prefix="/fonts">
         <file alias="JetBrainsMono.ttf">fonts/JetBrainsMono.ttf</file>