Rebuild mobile editor as locked visual-viewport stage

[Digidai]

Summary

• replace the mobile editor layout model with a fixed visual-viewport stage (html.editor-stage + body.editor-body) and remove document-growth keyboard padding behavior
• make .desk/.sheet/.well a stage-contained flex layout where only the textarea scrolls on mobile, while preserving desktop A4 paper and non-editor page scrolling
• move mobile completion/hint positioning into stage-contained layout behavior, keep toast anchored inside the stage, and remove --mobile-editor-bottom-gap/--keyboard-offset
• update viewport syncing to write --app-height from visualViewport.height (fallback innerHeight), keep mobile resize() CSS-owned, and prevent mobile keepInputVisible() from window scrolling
• bump release version to 0.10.0 and update cache-busting asset URLs
• refresh mobile UI tests to assert the new stage lock model and preserved desktop/completion behaviors

Testing

• npm test
• npm run check

  

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