Fix iPhone Safari mobile paper layout in 0.9.4

[Digidai]

Summary

• switch editor markup to sheet > well > (mirror + textarea) so mobile inset is owned by a real inner wrapper instead of textarea-covered parent padding
• rework mobile paper CSS to use .sheet { flex: 1 1 0; min-height: 0; } with .well margin inset and no mobile sheet padding
• update resize() to keep mobile height CSS-owned unless content overflows the .well, clearing inline height when content shrinks
• add static asset cache-busting query params (?v=0.9.4) for editor/archive/settings pages and server-rendered pages via WRITER_VERSION
• bump version metadata and changelog to 0.9.4
• refresh mobile editor regression tests for .well markup, mobile CSS inset strategy, overflow-only resize behavior, and versioned assets

Validation

• node --test test/mobile-editor-ui.test.js
• npm test
• npm run check

  

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