[GrantFox][Medium] Synchronize filters and pagination with URL state

Summary

Synchronize filters and pagination with URL state

Why this matters

Users need shareable, reload-safe market filters without invalid page combinations.

Scope

Define typed URL parameters, reset rules, validation, and stable query keys.

Acceptance criteria

• Reload restores the same filter state.
• Changing filters resets pagination.
• Invalid parameters fall back safely.
• Tests cover back/forward and shareable URLs.

Validation

Add regression coverage for existing behavior, failure modes, authorization boundaries, and compatibility. The implementation must pass the repository CI checks.

Non-goals

• Typo-only, formatting-only, or documentation-only changes.
• Unrelated refactors or dependency upgrades.
• Weakening existing security, authorization, CI, or production safeguards.

Contributor application

Before implementation, comment with relevant experience, a 1–4 bullet approach, and an estimate for opening the first draft PR. Wait for maintainer assignment before coding.

PR requirements

Use a feature branch, include Closes #<issue-number>, check every acceptance criterion, link criteria to code/tests, explain security and failure-mode considerations, and pass CI.

Reward-readiness

This is a substantive GrantFox campaign issue. Merge and CI success do not by themselves guarantee reward eligibility; final reward-readiness is determined by campaign review.

Start by locating the existing market filter and pagination state, their URL handling, and the relevant test entry points. Define the typed URL parameters, reset and validation behavior, then add regression coverage for reloads, back/forward navigation, shareable URLs, invalid parameters, and authorization boundaries. Done means all acceptance criteria pass and repository CI succeeds.