docs: address review scope and feature placement for #1032

CHANGELOG.md

@@ -17,6 +17,9 @@
 
 - Street Level requests count each tile once when dateline bounds overlap at coarse zoom levels.
 
+- Street Level counts unique tiles before ranking so overlapping dateline halves
+  in polar views do not waste slots in the 16-tile overview budget.
+
 - Treat explicitly current, complete empty vessel coverage as a successful update,
   clearing obsolete contacts while retaining stale or incomplete snapshots.