🎨 Board Visual Overhaul & Theme Enhancements

This update is primarily focused on refining the "Board" experience, making it more visually immersive and compatible with dark mode.

Enhanced Board Cards: Added a premium 3D perspective effect to board folders on hover, with a cleaner UI for the "front pocket" layer.
Per-Board Styling: Fonts and backgrounds are now saved individually per board. Each board can have its own unique personality!
Dark Mode Polish: Total overhaul of board backgrounds (Grid, Dots, Cork) to ensure perfect visibility and aesthetics in both Light and Dark modes.
Better Typography: Text colors on board cards now automatically adjust to ensure readability against any folder color.

Performance: Removed unused legacy components to optimize the application bundle size.
Stability: Fixed several strict type-checking issues to improve overall app stability.

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