feat(mr): show source and target branches in view

Kai Armstrongrequested to merge
phikai/mr-view-show-branches into main

What does this MR do?

Reorganizes the glab mr view TTY header so the title/IID lead — matching the layout of the GitLab web view — and adds the source and target branches to the meta line so users can see the merge direction at a glance without inspecting JSON output. Adds source_branch: and target_branch: keys to the raw non-TTY output for scripting parity.

Before

open
 • opened by @jdwick 5 minutes ago
mrTitle !13

After

mrTitle !13
open • @jdwick opened 5 minutes ago • merge: feature-branch → main

The merge: prefix makes it unambiguous that the two names separated by an arrow are branches.

Related issues

Closes #8494 (closed)

Author's checklist

  • Code refactoring guidelines followed.
  • Tests updated.
  • Commit messages follow the Conventional Commits spec.

Review checklist

  • Behavior matches the issue's requested output shape.
  • Non-TTY raw output remains scriptable.

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