Mockup
Nested switcher (mailbox → address)
AL-2 §B2 — the approved nested-switcher flow, live. The mailbox name sits in the header; a ScopePill under it is the inline address filter. Tap the pill to open the AddressSheet — search across all discovered aliases, pick one, and the same inbox flips inline to that address (header pill updates, × appears, list re-filters). Tap × to clear back to the whole domain. Pin, mute and label persist across scope changes. Two orthogonal facets: scope in the header, state in the tab row.
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