feat: components follow the Paper design; destructive becomes a tint

[YaelAnaya]

Summary

• Components follow the design file. Every component was compared with its specimen and spec text on the Paper page 02 — Core Components, and the code moved to the design where they disagreed.
  • Alert gains info, success and warning; info/success are role="status", warning/destructive role="alert".
  • Table gains TablePagination, a <tfoot> pager with a live range, rows per page, page n of N and first/previous/next/last buttons, plus loading and count-only states. It is exported, tested and documented.
  • Geometry and role fixes in Tabs, Breadcrumb, Pagination, Command, Combobox, Card, Item, Attachment, Dialog, Sheet, Empty, Input, Textarea, InputGroup, Switch, ButtonGroup, Toggle, ToggleGroup, Kbd and Sidebar.
• Destructive becomes a tint. --destructive takes new values, loses --destructive-surface and gains --destructive-foreground.
  • Every destructive variant or state now uses the Button's recipe: the role over /10 of itself (/20 in dark), with a /20 hover (/30).
  • That covers Alert, Badge, the menus' destructive items, Attachment's error tile and the error toast.
• Button drops the inline size. A link in prose is variant="link" with h-auto p-0.
• The dark --input stroke is neutral-200 at 12%.
• Fixes:
  • PopoverAnchor positioned nothing. Radix's popper registers anchors through an attach-only callback ref; the trigger registered last and then remounted, so the content measured a detached button at (0,0). The anchor now remounts once so it registers last.
  • DialogFooter showCloseButton now puts Close ahead of the call site's actions.
• Docs site:
  • Navigation is grouped by the design's categories, with a three-lane layout and a table-of-contents rail.
  • Overlay demos have realistic content sized to it.
  • MDX code blocks get a copy button.
  • The preview stage has no background.

The Paper file was updated to match this branch (tokens, core components, project components and screens) outside this PR.

Notes for review

• Contrast: text-destructive on its own /10 tint measures 3.99:1 in light, below 4.5:1 for body text. This is the Button recipe as chosen, now shared by Alert, Badge and the menus.
• Breaking change: removing --destructive-surface and the inline Button size breaks consumers that use them. The package needs a minor bump, and possibly a note in the migration guide.

Test plan

• pnpm verify passes locally: format, lint, typecheck, 152 unit tests, build, docs check and build, and the packed-package consumer test (12 tests)
• Overlay demos, Alert, Badge and Button checked in a browser in light and dark
• Popover anchor positioning checked in a browser (the anchor measures 134px, not 0)