Add rates for materials even if not currently used

Give every material a rate so that any material a designer later uses is not passed to the client without a price.

1. If a designer later uses a material that has no rate, it will effectively be passed to the client without a price.

   ✓ 16 அக்டோபர், 2026 அன்று தயாரிப்பில் சரிபார்க்கப்பட்டது