The isAdmin parameter on MainAppBarActions defaulted to false and no
call site passed it, so the Admin overflow item never appeared for
actual admins — leaving the admin section unreachable from normal UI.
Move the lookup into a tiny AppBarActionsViewModel that reads
AuthController.currentUser, and drop the parameter from the public
signature so future call sites can't recreate the dead-param hazard.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
bvandeusenandClaude Opus 4.7
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