[FEATURE] ESC while scrolling history should return to prompt, not interrupt processing

Preflight Checklist

• [x] I have searched existing requests and this feature hasn't been requested yet
• [x] This is a single feature request (not multiple features)

Problem Statement

When scrolling through conversation history (context scroll), pressing ESC the first time should exit scroll mode and return to the active prompt — not interrupt the current processing/generation.

Proposed Solution

Current behavior: First ESC interrupts the running operation.
Expected behavior: First ESC exits history scroll, returns focus to current input. Second ESC (or separate keybind) interrupts processing.

Alternative Solutions

_No response_

Priority

Medium - Would be very helpful

Feature Category

CLI commands and flags

Use Case Example

_No response_

Additional Context

_No response_