Keep map theme state aligned

docs/CODEX_EXECUTION_LOG.md

@@ -9365,7 +9365,7 @@ Boundaries:
 Validation so far:
 - Backend compile and frontend typecheck passed.
 - Source-catalog plus governed-refresh focused suite passed: 20 tests.
-- Full `scripts/run_readiness_check.sh` passed: 780 backend tests, 110
+- Full `scripts/run_readiness_check.sh` passed: 781 backend tests, 110
   documented route contracts, one Alembic head, frontend typecheck/build and
   all packaged smoke checks.
 - Live Tower staging completed all 112 municipality/theme partitions for
@@ -9379,6 +9379,10 @@ Validation so far:
 - Live browser validation exposed and fixed additive theme ranking where two
   extra old water features could outweigh a newer observation date. Ranking is
   now priority, observation date, import date, then feature-count tie-breaker.
+- Post-deploy browser validation also exposed a stale map-theme remount state:
+  returning from Status to Map could retain the Water legend while the viewport
+  query and zoom guidance reverted to Buildings. Map state now initializes from
+  the selected persisted dataset so all four signals remain aligned.
 
 Next:
 - Run the full release gate, deploy to Tower, execute a live read-only plan and