feat: replace sonner with base-ui toast component

[adelrodriguez]

Replaces the sonner toast library with a custom Toast component built on @base-ui/react/toast. The new toast.add({ title, type }) API replaces toast.success() and toast.error() calls across all auth forms. The Toaster component is now self-contained with its own provider, portal, viewport, and toast list rendering, including icon support for success, error, info, warning, and loading states.

Also adds several new UI components to the package:

• DataTable — a wrapper around @tanstack/react-table with empty state support
• Attachment — a composable file/media attachment display component with size, orientation, and state variants
• Bubble / BubbleContent / BubbleReactions — chat bubble components with alignment and variant support
• Message / MessageGroup / MessageAvatar / MessageContent / MessageHeader / MessageFooter — message layout primitives
• MessageScroller — a scroll container built on @shadcn/react/message-scroller with auto-scroll behavior and a scroll-to-end button
• Marker — a labeled divider/separator component
• Questionnaire — a multi-step form component built on @shadcn/react/questionnaire with choices, navigation, and validation support
• DirectionProvider — re-exports @base-ui/react/direction-provider

Adds @shadcn/react and @tanstack/react-table as dependencies, removes sonner, and upgrades shadcn to 4.16.2.

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[adelrodriguez]

• feat: replace sonner with base-ui toast component #138 : 2 dependent PRs (#139 , #140 ) 👈 (View in Graphite)
• main

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[adelrodriguez]

@codex review

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Codex Review: Didn't find any major issues. 👍

Reviewed commit: c366081269

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