Tasks

• [x] Add and run failing viewport and movement regressions.

• [x] Share geographic predicates and validate/apply Explore bounds.

• [x] Connect throttled live map movement to list queries without camera resets.

• [x] Add IP-based initialization with failure/interaction safeguards.

• [x] Add safe marker hover/focus popups and lifecycle tests.

• [x] Run quality gates, regenerate API types, and update frontend/API/checklist documentation.

• [x] Reproduce continuous-motion filtering failure, fix event delivery and throttling, verify live DOM updates, and update the PR.