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gsxdsm 8b8e25c501 FN-6696: promote Command Center in responsive navigation

Promote Command Center into fixed responsive nav positions while preserving overflow access for displaced views.

- Add tablet Header behavior that shows Command Center inline after Agents and moves Documents to the overflow menu.
- Add mobile top-level Command Center tab immediately after Mailbox and demote primary plugin tabs to More.
- Update navigation tests for tablet, desktop, mobile, and plugin overflow ordering.
- Add an xs font-size token for mailbox tab reuse.

Files changed:
 .../app/__tests__/tablet-header-controls.test.tsx  | 24 +++++++
 packages/dashboard/app/components/Header.tsx       | 82 ++++++++++++++++------
 packages/dashboard/app/components/MailboxModal.css |  4 +-
 packages/dashboard/app/components/MobileNavBar.tsx | 31 ++++----
 .../app/components/__tests__/Header.test.tsx       | 24 +++++++
 .../app/components/__tests__/MobileNavBar.test.tsx | 47 ++++++++++++-
 packages/dashboard/app/styles.css                  |  3 +-
 7 files changed, 174 insertions(+), 41 deletions(-)

Fusion-Task-Id: FN-6696

Fusion-Task-Lineage: e24bb740-7429-40f1-8612-d9af03486d26

2026-06-19 05:18:29 -07:00