feat: improve accounts dashboard with activity feed and bug fixes

.changeset/accounts-dashboard-improvements.md

@@ -0,0 +1,11 @@
+---
+"adcontextprotocol": minor
+---
+
+Improve accounts dashboard with activity feed and bug fixes
+
+- Add new Activity tab showing unified activity stream (Slack, emails, events, payments, working groups)
+- Fix "Needs Attention" to exclude paying members in good standing (only show prospects with action items or members with expiring subscriptions)
+- Fix fire emoji display in account detail page
+- Loosen "Hot Prospects" criteria (engagement >= 50 OR high interest, not AND)
+- Extend "New Insights" from 7 days to 30 days of Slack activity

server/public/admin-account-detail.html

@@ -90,7 +90,6 @@
     /* Engagement fires */
     .engagement-fires {
       font-size: var(--text-xl);
-      letter-spacing: 2px;
     }
 
     /* Member status badges */