feat(ui): update redpanda-ui to ui-registry v2.1.0

[c-julin]

What

Updates Console's vendored redpanda-ui components to ui-registry v2.1.0 (the Base UI–native major release).

Important

Stacked on #2525 (React 19). Registry v2.1.0 components are typed for React 19 (Base UI useRender, mutable RefObject.current, no string refs). On React 18 this produced 6 type errors in vendored components; all 6 disappear on top of #2525 with zero compat patches. Base this PR on ben/console-react-19; review/merge after #2525.

Changes

• Re-synced all 74 registry components to v2.1.0 via the shadcn registry, dropping the removed lib/base-ui-compat shim.
• Migrated call sites off the Radix-compat API (per the registry's upgrading-to-base-ui guide + codemod):
  • asChild → render across ~65 files (jscodeshift codemod) + the expression-child cases the codemod skips.
  • Accordion: dropped type/collapsible; value/defaultValue now string[]; onValueChange is (value[], details).
  • ToggleGroup: dropped type; value now string[]; callbacks destructure [v].
  • Removed the dropped transition prop from Progress / Collapsible / Popover / Tabs / Card.
  • Dialog onOpenAutoFocus={e => e.preventDefault()} → initialFocus={false}.
  • Card: removed the dropped animated/motion props (entrance animations on the rp-connect onboarding cards are dropped — see Follow-ups).
• Dependency bumps required by v2.1.0 components:
  • recharts 2 → 3, react-resizable-panels 3 → 4 (direction → orientation), added cnfast (new cn() impl in utils).

Type-check status

tsgo is clean except 5 errors at the React-19 + shiki/react-markdown typing boundary (code-block-dynamic.tsx, use-shiki.tsx). use-shiki.tsx is byte-identical to the #2525 base (untouched by this PR) yet errors — i.e. this friction belongs to finalizing React 19, not the registry bump. All five share one root cause (a pre component whose ComponentProps<'pre'> doesn't match hast's Components type) and should resolve together as #2525 settles its shiki typings.

Follow-ups

• Resolve the shiki/markdown pre-component typing (jointly with feat(frontend): migrate to React 19 via Module Federation bridge #2525).
• Decide whether to re-add entrance animation to the rp-connect onboarding cards (registry intentionally removed Card's animated path) by wrapping in motion.div.
• data-[state=…] Tailwind selectors in app code still use the Radix attribute names; remap to Base UI (data-open/data-popup-open/data-panel-open/data-pressed) for correct open/active styling (visual-only, not a type error).

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