Annotate each selected element with its own instruction in Studio

When you pick multiple elements in Studio's preview, you can now attach a separate instruction to each one — for example, tell the agent to "make this green" on the hero image and "remove this" on a button, all in a single message. Numbered markers appear directly in the preview so you always know which element maps to which instruction. Clicking a marker opens a floating card where you can write, edit, or delete that element's annotation. Each instruction travels to the agent alongside the element, giving it the precise context it needs to handle every highlighted item correctly.