fix(document): skip no-op YAML rewrites on editor open

[TotomInc]

Summary

Fixes #546.

Opening a page in the visual editor was enough to rewrite ::component YAML (key order + omitted Vue defaults) and, on the next open, surface a Git vs Website conflict. This PR stops those silent writes and keeps authored prop order when the component form saves.

• Skip TipTap hydration onUpdate so mounting the stored document does not write a draft
• Skip the dev-host filesystem PUT when isMatchingContent says the rendered document matches the file on disk
• Convert component form values back to props in source key order, omit meta-only Vue defaults, and keep defaults that were already authored
• Cover the Opening a page in Studio rewrites Comark block YAML (key order + default props) and then conflicts on reopen #546 ::media-section YAML-order case in isDocumentMatchingContent, plus form-prop round-trip tests

Related: #356, #382, #544.

Out of scope

• checkConflict still has a raw-string fallback after structural compare
• legacy.ts unbind order and getOrderedSchemaKeys alphabetical frontmatter sort are unchanged

Test plan

• Open a page with mixed scalar + nested object YAML (see content/index.md in studio-repro) without editing — git status stays clean
• Confirm omitted Vue defaults (e.g. imageSize: 1/2) are not written into the YAML
• Confirm an explicitly authored default is kept
• Re-open the same page in production and confirm no Git vs Website conflict from key-order-only drift
• Edit a real prop and confirm the file still updates

[vercel]

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[pkg-pr-new]

npm i https://pkg.pr.new/nuxt-studio@547

commit: fe6fd3b