fix(10-04): prettier format + remove unnecessary type assertions

- Run prettier on all new/modified PWA files (CredentialSheet, SetupBanner, AdminPage, admin.spec.ts)
- Remove unnecessary 'as React.RefObject<HTMLElement | null>' casts flagged by @typescript-eslint/no-unnecessary-type-assertion
- Format pre-existing API files from Plans 02/03 (me.ts, user.test.ts, requireAdmin.test.ts, me.test.ts)
- All 270 API tests + 191 PWA vitest tests pass; lint/typecheck/build clean

apps/pwa/src/routes/AdminPage.tsx

@@ -77,8 +77,7 @@ export function AdminPage() {
   });
 
   // Derive current saved shared calendar id from the data
-  const currentSharedId =
-    calendarsQuery.data?.calendars.find((c) => c.isShared)?.id ?? null;
+  const currentSharedId = calendarsQuery.data?.calendars.find((c) => c.isShared)?.id ?? null;
 
   // Effective selected = user pick OR fallback to current saved
   const effectiveSelected = selectedCalendarId ?? currentSharedId;
@@ -97,8 +96,7 @@ export function AdminPage() {
   // Open credential sheet for a member
   function openSheet(member: AdminMember, buttonRef: React.RefObject<HTMLButtonElement | null>) {
     // Capture the button so focus can return on close
-    (triggerRef as React.MutableRefObject<HTMLElement | null>).current =
-      buttonRef.current;
+    (triggerRef as React.MutableRefObject<HTMLElement | null>).current = buttonRef.current;
     setSheetMember(member);
     setSheetMode(member.hasCredential ? 'admin-rotate' : 'admin-add');
     setSheetOpen(true);
@@ -298,7 +296,7 @@ export function AdminPage() {
           mode={sheetMode}
           memberName={sheetMember.displayName}
           memberId={sheetMember.id}
-          triggerRef={triggerRef as React.RefObject<HTMLElement | null>}
+          triggerRef={triggerRef}
         />
       )}
     </div>