Release Mail Tools 0.1.0

public/THIRD_PARTY_NOTICES.md

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+# Third-party notices
+
+Mail Tools is GPL-3.0-or-later. Runtime components include React and React DOM
+(MIT), DOMPurify (MPL-2.0 OR Apache-2.0), and the add·ideas Toolbox contract,
+shell and helpers (their package metadata and corresponding source apply).
+
+The build generates `LICENSES/npm-runtime-licenses.txt` from the exact lockfile
+and installed packages. No remote font, icon, script, stylesheet or service is
+used at runtime.