Variant option updates and new Add Contact modal

We've made two quality-of-life updates to Bottle:

1. Variant Editing Made Safer: Now, instead of changing names of existing variants (like “shrimp” to “mussels”), you delete the old one and add the new. This keeps your reports accurate and orders clear.
2. Easier Customer Adds: Add customers directly from the customers page—quick and simple.

Enjoy these updates designed to make your Bottle experience better and your work smoother.