Ability to Save Themes

Problem:

Users need the ability to save their customization preferences and access pre-built theme presets for quick styling.

Solution & Implementation:

Add a "Theme" option to the floating bar that allows users to:

• save their current customization settings as a custom theme
• access saved themes and default presets
• apply themes with one click Implementation
• add a "Theme" option to the floating navbar that uses Zustand to persist user preferences.
• UI will show a draggable panel on desktop and simple icon on mobile, with a scrollable list containing a "Save Current Theme" button plus saved and preset themes. Follow existing component patterns for consistent styling.