[upstream #16961] 16961: Persist the reviewer's approval decision on resumed tool calls #321

Codex finding on LibreChat-AI#16961: LibreChat-AI#16961 (comment)

LibreChat-AI#16961 maps a tool call's approval.decision (and reason) to the AI SDK states approval-responded and output-denied, but no producer writes that field yet. The client stamps approval on the live cache in client/src/utils/approval.ts without the decision, the final SSE merge in client/src/hooks/SSE/steps/content.ts rebuilds the tool call without approval, and the resume path persists only the tool output. So a real resumed call reaches the mapper with no decision and maps exactly as it did before LibreChat-AI#16961 (approval-requested while unresolved, output-available/output-error once ended); the new states are reachable only through hand-built stored calls.

Fix: record the submitted decision and reason on the resumed tool call (stamp it client-side when the decision is submitted, keep approval through the final SSE merge, and persist it on the server-side resume so a reload carries it), then cover reject and respond through a resume end to end.