feat: Plugin search and filter UI for better UX #22
Description
Feature Request
What: Add live search + status filters to plugin browser table
Why: Improve UX for managing 100+ plugins (search "akismet", filter by status)
Implementation planned:
- Live search input (name + description)
- Status dropdown (active/inactive/updates)
- AJAX handler + nonce security
- WP_List_Table patterns
Acceptance criteria:
- Search "akismet" → Shows only matching plugins
- Status filter works with search
- No page reloads (live filtering)