Add save-to-profile prompt on movement finish pages

[rzueger]

Summary

• Inline prompt on departure/arrival finish pages offering to save pilot info and aircraft to the profile
• Three modes: empty profile (saves pilot data + aircraft), aircraft not in profile (saves aircraft), aircraft changed (updates aircraft)
• Warm amber banner with star icon, "Speichern" action link + dismiss ×
• Green success confirmation pill on save
• Placed after payment completion on arrivals to avoid confusion with payment context
• Respects profileEnabled flag, skips guest/kiosk/ipauth users
• Checks confirmed state early to prevent Redux re-render from hiding the success message

Test plan

• npm test — 1775 tests pass
• npm run typecheck — clean
• New user: first departure → "Save pilot info and aircraft" prompt → click Save → green confirmation
• Existing user, new aircraft: departure → "Save HBXYZ to your profile?" prompt
• Existing user, changed MTOW: arrival → "Update HBXYZ in your profile?" prompt
• Same aircraft, no changes: no prompt
• Arrival with payment: prompt shows after payment, not during
• Click × to dismiss: prompt disappears
• profileEnabled: false (lspv): no prompt
• Guest/kiosk user: no prompt