feat(ui): F1+F2 — component primitives + rebuilt app shell
F1: shadcn-style primitive set in components/ui (Button, Card, Badge, Input,
Switch, Separator, Skeleton, Tooltip, DropdownMenu, Dialog, Sheet, Tabs, Table,
Toast+useToast, ThemeToggle, PageHeader/StatCard/EmptyState) on Radix + cva.
F2: Layout rebuilt on the new system — sidebar with primary nav (lucide icons)
+ favorites/saved-searches/mailbox/smart-folder sections, sticky topbar with
search, sync status, theme toggle, digest toggle, and an account dropdown. All
prior behavior preserved (auth, sync, collapse/section persistence, "/" search
focus). App wrapped in ToastProvider + TooltipProvider. Build green.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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