Assist Widget Keys

Resolve a styling/content intent to that widget's REAL Elementor control keys.

The alternative is pulling the widget's whole control registry into the agent's context — the largest single payload our tools can produce — to learn two or three names. Here the registry goes to Flash-Lite instead, and only the answer comes back. Every returned key is checked against the registry before it leaves, so this cannot degrade into a smaller model guessing.