Fix PR Review Comments

Fix PR review comments by implementing the requested changes.

Usage

/pr-review <PR_URL>      # Review PR by URL (expects full GitHub URL)
/pr-review <PR_NUMBER>   # Review PR by number (expects number, e.g., 123)
/pr-review               # Auto-detect PR from current branch

📋 Argument Handling

The command accepts the PR identifier from $ARGUMENTS:

1. PR URL: Full GitHub PR URL (e.g., https://github.com/owner/repo/pull/123)
2. PR Number: Just the PR number (e.g., 123)
3. No Arguments: Auto-detect the PR associated with the current Git branch