Show the call's describe_intent sentence as the heading of the tool approval card

[goljavieglc]

What. When a tool has describe_intent enabled, the model writes a one-sentence label for each call in an intent argument (e.g. "Creating a ticket for Juan"). The tool approval card currently shows the tool name as its heading (e.g. create_work_package_mcp_openproject) and leaves intent inside the raw JSON body.

Proposal. When the request carries a non-empty intent string, use it as the card heading, show the tool name underneath in secondary text, and leave intent out of the arguments body. Without intent, nothing changes.

Why. Approvers are usually not the people who configured the tools. "Creating the PN-101 work package in HTB Guion Manufacturing" is something a user can approve. A tool name plus a JSON blob is not, and people end up approving on trust. The sentence already exists, because the model writes it for the activity label, so this only reuses it.

Scope / areas affected. Approval preview building (on dev, buildApprovalPreview in @librechat/chat) and the review panel (client/src/components/Chat/approval/Review.tsx). The intent needs its own character bound, like the other labels, and counts toward the batch preview budget. No backend or API changes.

Status. We run this as a local patch on v0.8.9-rc1 (before the preview moved into packages/chat), with tests in preview.test.ts and Review.test.tsx. We can share the patch or port it to dev if the approach is welcome.