SuperMD v0.0.6

SuperMD goes cross-platform. One codebase, three operating systems
— the same GPU-rendered editor, hybrid WYSIWYG, live diagrams, git
diffs, and workspace search, now on Linux and Windows.

✨ Platforms

• macOS — the DMG, signed and notarized as always
• Linux (new) — a .deb (registers the desktop entry and
  markdown association) or a tarball with a no-root install.sh.
  Wayland and X11 both supported; client-side decorations where your
  compositor allows, system titlebar otherwise
• Windows (new) — an installer (Start Menu, optional .md
  association, uninstaller) or a portable zip. Not yet code-signed:
  SmartScreen will show one "unrecognized app" prompt — More info →
  Run anyway

🔧 What parity means here

• All shortcuts translate automatically (⌘ → Ctrl, focus mode on
  Ctrl+Alt+F) — the shortcuts dialog shows your platform's keys
• Native-feeling window chrome: custom min/max/close controls in the
  tab bar on Windows and Linux CSD
• A ☰ menu on Linux/Windows carrying everything the macOS menu bar has
• Platform fonts (Segoe UI/Consolas, DejaVu), same ~/.supermd
  config location everywhere
• One found-and-fixed: a tree-sitter grammar (Julia) miscompiles under
  MSVC — SuperMD now degrades any broken grammar to plain text
  instead of crashing

Linux and Windows builds are brand new — issues and feedback
welcome.

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Full Changelog: v0.0.5...v0.0.6