refactor: simplify DevRoleSwitcher by removing role selection and unused variables

nest-front/src/components/shared/DevRoleSwitcher.tsx

@@ -1,8 +1,7 @@
 import { useAuth } from '../../contexts/AuthContext';
-import type { UserRole } from '../../types';
 
 /**
- * Developer-only overlay to quickly switch user roles for testing.
+ * Developer-only overlay to quickly log in as test accounts.
  * Only visible in development mode.
  */
 export function DevRoleSwitcher() {
@@ -12,9 +11,8 @@ export function DevRoleSwitcher() {
 }
 
 function DevRoleSwitcherInner() {
-  const { user, isAuthenticated, devSetRole, login, logout } = useAuth();
+  const { user, isAuthenticated, login, logout } = useAuth();
 
-  const ROLES: UserRole[] = ['user', 'dev', 'com'];
   const DEV_ACCOUNTS = [
     { label: 'Dev/Admin (Kestrel)', email: 'kestrel@crowmate.dev' },
     { label: 'Com Staff (Vesper)', email: 'vesper@crowmate.dev' },
@@ -48,30 +46,10 @@ function DevRoleSwitcherInner() {
           <div style={{ color: 'var(--color-text-muted)', marginBottom: '0.4rem' }}>
             Logged as: <strong style={{ color: 'var(--color-text)' }}>{user?.username}</strong>
           </div>
-          <div style={{ color: 'var(--color-text-muted)', marginBottom: '0.5rem' }}>
+          <div style={{ color: 'var(--color-text-muted)', marginBottom: '0.75rem' }}>
             Role: <strong style={{ color: 'var(--color-green)' }}>{user?.role}</strong>
           </div>
 
-          <div style={{ display: 'flex', gap: '0.3rem', marginBottom: '0.5rem', flexWrap: 'wrap' }}>
-            {ROLES.map((r) => (
-              <button
-                key={r}
-                onClick={() => devSetRole(r)}
-                style={{
-                  background: user?.role === r ? 'var(--color-amber)' : 'transparent',
-                  border: '1px solid var(--color-amber)',
-                  color: user?.role === r ? '#000' : 'var(--color-amber)',
-                  padding: '0.1rem 0.4rem',
-                  cursor: 'pointer',
-                  fontFamily: 'var(--font-mono)',
-                  fontSize: '0.65rem',
-                }}
-              >
-                {r}
-              </button>
-            ))}
-          </div>
-
           <button
             onClick={logout}
             style={{