Contracted values now auto-populate for smarter forecasting

We've revamped how contracted revenue works to reduce manual work and improve accuracy across all booking stages.
✨ What's new
Contracted values now mirror blocked values by default
Automatically locks when marked Definite/Lost
Manual overrides remain available when needed
🔍 Why this matters
✔️ Fewer blank fields in early-stage groups
✔️ More accurate revenue projections
✔️ Clearer pipeline visibility from lead to definite
💻 Admin heads-up
The old "Contracted Guest Rooms" setting has been retired as this new behaviour makes it obsolete.