Dashboard: list the rules' quotas

A Quotas panel with each quota's allowance, use (or, per address, the
count and the busiest), a usage bar and the next reset. The usage bar
moves to widgets.js and the Rules page's usage dialog shares it.

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

CHANGELOG.md

@@ -8,6 +8,10 @@ All notable changes to Housecarl are documented here. The format follows
 
 ### Added
 
+- **Quotas on the dashboard.** With any rule holding a quota, the
+  dashboard lists them all: the allowance, what is used (for a
+  per-address quota, how many addresses and the busiest) with a bar, and
+  the next reset. Each opens its rule.
 - **Links to a rule open it.** A rule named in the matrix, the log, the
   tracer, statistics or the dashboard's busiest rules opens the Rules
   page on its chain, scrolled to it and highlighted (`#/rules?rule=ID`).