Fusion 0625f4a64a feat(FN-2334): align mailbox tab controls with shared button styles ...

- Apply shared btn btn-sm btn-secondary classes to mailbox tabs and agent subtabs in MailboxModal and MailboxView
- Update mailbox tab/subtab CSS to use bordered surface button defaults with active-state border, background, and focus-ring styling
- Add component tests asserting mailbox tab, subtab, and action controls keep shared button class contracts
- Add CSS regression checks to prevent reintroducing border:none/background:none square-edge tab styles

2026-04-24 11:58:34 -07:00

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