Big update for nail techs and salons:
• Service durations now go up to 6 hours
• Add appointments yourself — log walk-ins, phone bookings, and past visits
• "Save & Add Another" for fast back-to-back entry
• New 5-minute duration selector for any length
• Salons: full service, price, and payment details on manual entries
• Warnings when a schedule change would leave days with no openings
• More accurate totals, translation fixes, and stability improvements