Consolidate all open PRs into main

[Copilot]

Applies the outstanding changes from 29 open PRs that were targeting main but not yet merged.

Component fixes

• carousel.tsx – export useCarousel hook (was defined but never exported)
• kbd.tsx – KbdGroup renders <div> instead of <kbd>; typed as ComponentProps<"div"> but was rendering the wrong element
• pagination.tsx – drop dead Button import; only buttonVariants was used
• dialog.tsx – ESC key handler now checks justEndedComposing() in addition to isComposing(), closing the 150ms post-IME grace-period window where Escape could still dismiss the dialog

Feature additions

• Marketplace / Dashboard – replace inline ad-hoc empty states with the Empty component suite (EmptyHeader, EmptyMedia, EmptyTitle, EmptyDescription, EmptyContent)
• ComponentShowcase – add FieldSet demo section covering basic legend, error state, horizontal layout, and FieldSeparator

Dependencies

• pnpm-lock.yaml – sync with package.json: add cors@2.8.6 snapshot, remove stale @vercel/analytics@1.6.1 entry

Housekeeping

• blockchain.js – trailing commas, reformatted long conditionals and template literals
• Workflow YMLs – fix indentation in generator-generic-ossf-slsa3-publish.yml run block; remove extra space before inline comment in deno.yml
• 27 markdown docs – blank lines after headings and before lists (Markdown lint compliance)

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