Fix mobile editor paper sizing and inset regressions

[Digidai]

Summary

• replace mobile editor paper sizing with flex-fill layout (.desk -> .sheet -> .input) instead of 100dvh subtraction heuristics
• remove --safe-top double counting where --bar-height already includes the real fixed bar height (.desk, .archive, .settings, .reader)
• move mobile writing inset to sheet-level paper padding vars and align mirror inset to the same vars to avoid textarea padding drift
• update resize() to enforce a mobile paper floor (sheet.clientHeight - sheet paddings) so the textarea never shrinks below visible paper and only grows for overflow
• focus the editor when tapping/clicking the desk void and show touch-specific Finish title copy without desktop shortcut glyphs
• bump version to 0.9.3 and document the fix in the changelog

Testing

• npm test

  

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