Implement server-side pagination for previous contacts and add a DXCC Summary tab. Controller Qso now uses last_custom_paginated and exposes total_rows/total_pages/current_page/limit. Logbook_model gained last_custom_paginated and last_custom_count to support paged queries. The previous_contacts view was updated with HTMX pagination controls and wrapping for a scrollable table; qso/index was refactored to a tabbed UI (Previous Contacts / DXCC Summary). Lookup result display was improved: responsive table, sticky header, consolidation of LSB/USB into SSB and filtering out empty modes. JS and CSS updates load DXCC HTML into the new tab, hide legacy dxccsummary elements, and add form reset / Escape handling to return focus to the previous contacts tab.
