Dashboard: a per-address quota's bar counts all its addresses

One address that used up its allowance filled the bar (100%). The bar
is now all the addresses together, and the dashboard and the rule's
quota line say how many used theirs up.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

CHANGELOG.md

@@ -114,6 +114,10 @@ All notable changes to Housecarl are documented here. The format follows
 
 ### Fixed
 
+- The dashboard's bar for a per-address quota showed only the busiest
+  address, so one address that used up its allowance filled it (100%).
+  The bar is now all the addresses together, and the dashboard and the
+  rule's quota line say how many addresses used theirs up.
 - Changing how a quota counts lost or muddled what it used: per address
   to a total started at nothing, per source to per destination kept the
   sources' use as if it were the destinations', and other groups left