chore: track prompt event

[tusharmath]

• feat(ui): track prompt content before creating chat event
• feat(ui): track prompt input before starting spinner

[augmentcode]

🤖 Augment PR Summary

Summary: Adds prompt telemetry tracking for the initial CLI-provided prompt/piped input before message handling starts.
Why: Ensures prompt content is captured earlier (before chat event creation and before starting the spinner), matching the interactive prompt flow.

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[augmentcode]

Review completed. 1 suggestion posted.

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