[FEATURE] Show all proposed edits simultaneously, then allow per-hunk accept/reject

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 VS Code extension, when Claude makes multiple edits, each edit requires Accept/Reject confirmation before proceeding to the next one. This blocks Claude from continuing until I respond.

Proposed Solution

## Requested behavior

1. Claude completes all proposed edits without blocking
2. All changes are shown in a unified diff view (like Source Control panel)
3. User can Accept/Reject each hunk individually
4. User can also Accept All / Reject All

Alternative Solutions

_No response_

Priority

Medium - Would be very helpful

Feature Category

Other

Use Case Example

## Use case

When I ask Claude to "fix all issues found in code review", I want to:

• See all proposed changes at once
• Compare them side by side
• Decide which to accept after reviewing the full picture

This is similar to git add -p or VS Code's Source Control diff view.

Additional Context

_No response_