Search and Filter Functionality

[DavidMiserak]

User Story:
As a user with many flashcards,
I need to be able to search and filter my card collection
So that I can quickly find specific cards or focus on particular topics.

Details and Assumptions:

• Search by card content, title, or tags
• Filter by deck/directory
• Filter by due date, creation date, or difficulty
• Support for combining search criteria

Acceptance Criteria:

Given I have a collection of cards
When I enter a search term
Then only cards matching that term should be displayed

Given I have cards with various tags
When I filter by a specific tag
Then only cards with that tag should be shown

Given I have cards in different directories
When I select a specific directory
Then only cards from that directory should be displayed