fix: revert to single-click service filter, show all services by default, page size 24

- Revert +/- buttons on service pills back to single-click = filter only this service
- Remove default exclusion of Exchange/SharePoint/Teams (privacy controls handle this server-side)
- Change default page size from 25 to 24 (divisible by 3 for the 3-column grid)
- Update DEFAULT_PAGE_SIZE config default to 24

backend/frontend/style.css

@@ -376,31 +376,6 @@ input {
   background: rgba(249, 115, 22, 0.25);
 }
 
-.pill__action {
-  display: inline-flex;
-  align-items: center;
-  justify-content: center;
-  width: 16px;
-  height: 16px;
-  border-radius: 4px;
-  margin-left: 4px;
-  font-size: 11px;
-  font-weight: 700;
-  line-height: 1;
-  cursor: pointer;
-  color: var(--muted);
-  background: rgba(255, 255, 255, 0.06);
-  border: 1px solid transparent;
-  transition: all 0.12s ease;
-  vertical-align: middle;
-}
-
-.pill__action:hover {
-  color: var(--text);
-  background: rgba(125, 211, 252, 0.2);
-  border-color: rgba(125, 211, 252, 0.3);
-}
-
 .event h3 {
   margin: 0 0 6px;
   font-size: 17px;