feat(tickets): improve the filtered empty state

[wescopeland]

This PR improves the empty state for filtered ticket list pages. Now, there's a button to revert your filter selection to the server default options. It prefetches on hover.

Before

After

[greptile-apps]

Greptile Summary

Improves filtered ticket-list empty states with scope-specific messaging, totals, reset actions, hover prefetching, and tests.

Confidence Score: 5/5

The PR appears safe to merge.

Empty-state classification and reset queries match backend scope and filter semantics.

_{Reviews (1): Last reviewed commit: "feat(tickets): improve the filtered empt..." | Re-trigger Greptile}