fix(audit-wave-9): standardize on Sheet for previews; doctrine in CLAUDE.md

Swap the one outlier (client-interests-tab.tsx) from Vaul Drawer to
Sheet side=right so every detail-preview surface uses the same
primitive. Document the doctrine: Sheet for side panels on both desktop
and mobile; Vaul Drawer reserved for mobile-only bottom-sheet UX
(currently just MoreSheet).

Closes ui/ux M11.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/components/admin/settings/settings-manager.tsx

@@ -258,6 +258,8 @@ export function SettingsManager() {
   }, []);
 
   useEffect(() => {
+    // Initial settings load on mount.
+    // eslint-disable-next-line react-hooks/set-state-in-effect
     void fetchSettings();
   }, [fetchSettings]);