Add card counts in non-wishlist binders

[ItayElf]

Problem Statement

Currently, card counts are only displayed on Wishlist binders. Regular collection binders do not show a total card count in the UI overview.

Use Case

• Scenario: Tracking a real binder with multiple copies of the same card is not possible, nor is tracking you deck which has multiple cards.
• Current Impact: It is difficult to see at a glance how many cards are in a given binder without opening it directly.

Proposed Solution

Use the same card count mechanism from the wishlist binders in the regular binders too

Additional Context

Wishlist binders already calculate and display this metric, so the backend logic or count aggregation pattern can likely be reused.