Directorium 0.2.1

Fixes the manifest name length (45-char limit) so the add-on loads correctly.

Install (temporary): Thunderbird → Tools → Developer Tools → Debug Add-ons → Load Temporary Add-on… → pick manifest.json (or use the attached .xpi).

Note: the "addressBooks permission invalid" message from the Firefox-based validator is a benign warning — Thunderbird fully supports it. The .xpi is unsigned, so it installs temporarily; permanent install needs signing via addons.thunderbird.net.