Improves usability of the user list for smaller screens with responsive
detail views and filter controls.
- Added collapsible detail rows to show key user info (Status, Traffic, Expiry, etc.) via toggle button.
- Adjusted table column visibility using Bootstrap (`d-none`, `d-md-table-cell`).
- Updated JS event handlers and column indices for responsive layout support.
- Replaced filter button group with a hamburger dropdown on mobile/tablet.
- Used Bootstrap responsive display classes to toggle between dropdown and full button set.
- Optimized card header space for smaller devices.
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