write 0.4.0

A fullscreen, distraction-free, write-only Markdown editor that fades text away to silence the writer's inner editor.
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# Iceboxed Tasks

- Non-Latin / IME composition (CJK etc.).
- Headings and lists (writer-triggered Markdown structure).
- Linux/Windows polish: egui/eframe is genuinely cross-platform, but **v1 targets macOS first** (the dev platform); other platforms track upstream egui maturity.