Fix/edit tool calls

[i1bro]

Summary

• capture file-change context from app-server events for later approval and tool-call updates
• use edited file paths as edit tool-call titles instead of the generic "Editing files"
• attach file locations and diff data to edit tool calls, with a turn-diff fallback when needed
• serialize session updates so the initial tool call is emitted before its completion update

Why

This makes edit tool calls understandable in the UI and avoids races where a completion update can arrive before the corresponding tool call exists.

Testing

• npm test

[AlexandrSuhinin]

I'm not sure why do we need a queue and then why we need to flush it instead of handling events?

[i1bro]

Because sendPrompt() must not return until all earlier events have been handled.