feat: refine admin forms, attendance and finance workflows

Squash merge PR #23.

Included changes:
- complete occupancy check-in required fields/default payload
- improve responsive admin management pages
- fix attendance edge cases and attendance period config
- refine wallet/finance-related workflow handling

Checks:
- npm run typecheck -w apps/admin
- npm run typecheck -w apps/server

apps/admin/src/test/helpers.ts

@@ -25,7 +25,9 @@ type Role = keyof typeof CREDENTIALS;
  * Login as a specific role and store the token in localStorage.
  * Returns the parsed response data.
  */
-export async function loginAs(role: Role): Promise<{ token: string; user: Record<string, unknown> }> {
+export async function loginAs(
+  role: Role,
+): Promise<{ token: string; user: Record<string, unknown> }> {
   const creds = CREDENTIALS[role];
   const res = await fetch(`${BASE}/api/auth/login`, {
     method: 'POST',