Implement open prompt in system text editor

[ericcurtin]

As seen in claude code via ctrl-g and gemini-cli via ctrl-x

[copilot-swe-agent]

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[sathiraumesh]

hi!!! @ericcurtin can i work on this feature ?

[ericcurtin]

Sure

[sathiraumesh]

@ericcurtin I have created changes for this can review