fix: clarify nearby ALPR counts and help locate cameras

CHANGELOG.md

@@ -2,6 +2,9 @@
 
 ## ALPR camera locations
 
+- Label the loaded camera count as nearby, show a purple-dot legend, and add
+  SHOW NEAREST to frame and select a loaded camera when none are on screen.
+
 - Keep nearby camera markers and selection stable during rotation, use bounded
   ground-centered coverage instead of the horizon rectangle, and reuse in-flight queries.