feat: implement Quick Add menu for mobile-first logging

[poketonova]

This PR introduces a Quick Add Menu (Floating Action Button) to streamline card logging and navigation, particularly for mobile users.

Rationale

High-volume collectors require a frictionless method to add cards to their portfolios rapidly. The existing sidebar and topbar "+ Add Card" button are functional but can be less accessible during rapid sessions. This feature provides a persistent, mobile-first interaction point.

Changes

• Created a new QuickAddMenu.vue component with a smooth "Floating Action Button" (FAB) interface.
• Included shortcuts for:
  • Search & Add Cards: Immediate jump to the search view.
  • Browse Sets: Quick access to set-based browsing.
  • My Collection: Toggle to the active portfolio view.
  • New Deck: Fast-track to the deck builder.
• Registered the component globally in App.vue for persistent availability across all views.
• Implemented responsive styling to ensure the menu sits comfortably above mobile navigation bars.

This improvement aligns Rarebox with best-in-class collector apps like Collectr by reducing the click-depth for core actions.

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