Delete single filter button

[WojciechMat]

Delete single filter button functionality

Implements working delete ("x") buttons for individual filter chips on the Events Discovery page.

Changes:

• Added onDeleted callbacks to Location, Date Range, and Price filter chips
• Replaced copyWith() calls with explicit EventFilterModel constructors to ensure proper filter removal
• Each delete button now properly clears its specific filter while preserving other active filters
• Maintains pagination state reset and triggers event reload after filter removal

Fixes: Filter chips now have functional delete buttons that actually remove the applied filters instead of being non-interactive.

[kryczkal]

LGTM

[Copilot]

Pull Request Overview

Adds fully functional delete buttons to the filter chips on the Events Discovery page, replacing previous non-interactive UI elements.

• Implements onDeleted callbacks for Location, Date Range, and Price chips
• Replaces copyWith() with explicit EventFilterModel constructors to clear individual filters
• Resets pagination and reloads events after filter removal