fix: support shared package manager commands in docs exports

[LadyBluenotes]

Description

Use the Markdown parser's package-manager transform for Markdown export and framework discovery, so they consume the same shared/framework command groups as the native tabs. Apply package-manager filtering on the frameworkless .md route too.

An unprefixed block can now supply three separate commands without repeating them for every framework:

<!-- ::start:tabs variant="package-manager" mode="local-install" -->

@tanstack/intent@latest list
@tanstack/intent@latest validate
@tanstack/intent@latest review

<!-- ::end:tabs -->

The existing native package-manager component already supports the parser's empty-key fallback group, including synchronized and persisted package-manager selection. No component changes are needed. Shared lines do not advertise a framework variant, and mixed shared/framework lines retain source order. docs-info.md documents this syntax and fenced literal arguments.

Dependency

Draft pending TanStack/markdown#12 and a release containing that change. Before this PR is ready, update @tanstack/markdown and its lockfile entry to that release.

This PR retains the existing dependency and lockfile (currently locked to 0.0.11). A clean install with that lockfile cannot pass the new shared-command regression assertions yet. No local tarball path or unpublished version is committed.

Verification

Tested against a locally packed build of TanStack/markdown#12 in an isolated checkout; temporary dependency edits were removed before committing.

• pnpm test passed, including typechecks and lint: 478 tests passed, one existing environment-gated skip.
• pnpm build passed.
• Formatting and git diff --check passed for all four changed files.
• A browser probe using the native package-manager tabs verified four package managers across eight framework/no-framework routes, three command lines in each of two synchronized blocks, and selection persistence after reload, with no page errors.

Regression assertions cover shared-only and mixed blocks, unknown/no framework selection, unchanged output without a package-manager selection, preserved markers, and literal command arguments.

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