fix(cursor): forward stream-json thinking events to the UI

[joostfaassen]

Summary

Cursor Agent emits type: thinking (delta/completed) over --output-format stream-json, but CloudCLI's Cursor bridge only handled system / user / assistant / result. Thinking events were dropped, so the Show thinking toggle stayed empty for Cursor sessions (reproduced with Grok 4.5 High Fast).

This buffers thinking deltas and emits kind: thinking on completed (with a flush before assistant as a safety net), matching the UI path that already renders thinking blocks for Claude.

Test plan

• Self-host CloudCLI with Cursor provider
• Enable Show thinking
• Start a session with a thinking-capable Cursor model (e.g. cursor-grok-4.5-high-fast)
• Confirm a thinking block appears before the assistant reply
• Confirm Claude sessions still show thinking as before

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