[FEATURE] "Updated plan" should have the option to show the edit.

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

In plan mode with a large complex plan - after I thoroughly reviewed the plan and flagged a few issues, I see:

● Updated plan
  ⎿  /plan to preview

● Updated plan
  ⎿  /plan to preview

● Updated plan
  ⎿  /plan to preview

● Updated plan
  ⎿  /plan to preview

● Updated plan
  ⎿  /plan to preview

Argh, that means it could have changed anything! Now I have to re-read the whole plan from scratch, and perhaps will accidentally overlook some consequential change it made! :(

Proposed Solution

There is no reason why plan edits can't show the diff the same way all other edits do. At least make it optional / Ctrl-o.

Alternative Solutions

_No response_

Priority

Medium - Would be very helpful

Feature Category

Interactive mode (TUI)

Use Case Example

_No response_

Additional Context

_No response_