fusion

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gsxdsm 901ca72efd FN-6912: slim the messages split pane divider

Slim the full-page Messages split-pane divider without reducing its interactive resize target.

- Reduce the visible mailbox split resize handle from space-sm to space-xs.
- Keep the pseudo-element hit target at space-sm for hover, active, and drag affordances.
- Extend MailboxView CSS coverage to assert the thinner handle and preserved target width.

Files changed:
 packages/dashboard/app/components/MailboxModal.css           |  8 ++++++--
 .../dashboard/app/components/__tests__/MailboxView.test.tsx  | 12 +++++++++++-
 2 files changed, 17 insertions(+), 3 deletions(-)

Fusion-Task-Id: FN-6912

Fusion-Task-Lineage: c5fccc5f-56b2-4188-8c27-51ed3b269f86

2026-06-22 03:34:15 -07:00