feat(expenses): add URL-backed filters and pagination

[Taiye21]

Add the neobrutalist expense filter panel with debounced search, payer/status/asset filters, page-size controls, URL synchronization, clear-all behavior, and client-side pagination.

Closes #207

[drips-wave]

@Taiye21 Great news! 🎉 Based on an automated assessment of this PR, the linked Wave issue(s) no longer count against your application limits.

You can now already apply to more issues while waiting for a review of this PR. Keep up the great work! 🚀

Learn more about application limits

[mergekeeper]

MergeKeeper review

Scope: in scope for linked issue #207.
Verdict: clean

Successfully implemented search, multi-select filtering, pagination, and URL synchronization for expense lists according to requirements.

Reviewed commit: dcc90fdf92eda9d8d4c7266f36246b293738a48b.
CI and merge eligibility are checked separately.

[Taiye21]

Hi @Cjay-Cyber-2, the implementation for issue #207 is pushed on the requested fork branch and this PR is ready for review. Closes #207.

[Taiye21]

@mergepay Merge conflicts resolved against latest main. Rebased fix/issue-207 onto upstream/main and pushed — new head: dcc90fd.

Conflict files: src/app/(app)/groups/[id]/page.tsx
Validation: git diff --check clean; no conflict markers; reviewed types/imports against main (no node_modules present, so tsc/lint skipped).

Note: upstream main had rewritten this page in #453 (filter toolbar layout). I kept the new layout and integrated the PR's ExpenseListFilters (URL-backed search + payer/asset/status filters) + pagination, replacing the older ExpenseFilterToolbar.

Please review / re-run CI when convenient. Thanks!