fix: show profile button while a logbook is open

Extract ProfileHeaderButton and open UserProfilePage from any screen
without leaving the active logbook.

Co-authored-by: Cursor <cursoragent@cursor.com>

client/src/components/ProfileHeaderButton.tsx

@@ -0,0 +1,25 @@
+import { useTranslation } from 'react-i18next'
+import { User } from 'lucide-react'
+
+interface ProfileHeaderButtonProps {
+  onClick: () => void
+}
+
+export default function ProfileHeaderButton({ onClick }: ProfileHeaderButtonProps) {
+  const { t } = useTranslation()
+  const username = localStorage.getItem('active_username') || 'Skipper'
+
+  return (
+    <button
+      type="button"
+      className="btn-icon skipper-badge"
+      onClick={onClick}
+      title={t('dashboard.open_profile', { name: username })}
+      aria-label={t('dashboard.open_profile', { name: username })}
+      data-tour="nav-profile"
+    >
+      <User size={18} aria-hidden="true" />
+      <span className="skipper-badge__name">{username}</span>
+    </button>
+  )
+}