feat(panel): dense tooltip pass — projects, products, social, KB, business, settings, notifications (178 tips)

Density bar: every dialog field, column header, filter, badge, and
status pill explains itself — grounded in the backend (ladder
normalization, rate-limit park/probe, self-hosted fallback, reindex
scope). Disabled buttons span-wrap so tips fire; tabs re-assert
data-state.

panel/src/components/knowledge-base/kb-stats-card.tsx

@@ -142,9 +142,11 @@ export function KBStatsCard({ stats, isLoading }: KBStatsCardProps) {
           </div>
         </div>
         {latestUpdated && (
-          <p className="text-xs text-muted-foreground pt-1">
-            Updated {formatDistanceToNow(new Date(latestUpdated))} ago
-          </p>
+          <HelpTip label={new Date(latestUpdated).toLocaleString()}>
+            <p className="text-xs text-muted-foreground pt-1 w-fit">
+              Updated {formatDistanceToNow(new Date(latestUpdated))} ago
+            </p>
+          </HelpTip>
         )}
       </CardContent>
     </Card>