feat: create autonomous Nivora package repository

Maintain a validated cross-distribution package catalog.
Automate upstream updates, isolated builds, diagnostics, and direct publication.
Build the official GitHub Desktop sources for Linux with working OAuth.

happ/happ-launcher

@@ -0,0 +1,9 @@
+#!/bin/sh
+
+# Happ's bundled Qt falls back to the generic GNOME platform theme, which
+# reports Qt::ColorScheme::Unknown. The bundled portal plugin follows the
+# desktop color-scheme setting and emits updates when it changes.
+QT_QPA_PLATFORMTHEME="${QT_QPA_PLATFORMTHEME:-xdgdesktopportal}"
+export QT_QPA_PLATFORMTHEME
+
+exec /opt/happ/bin/Happ "$@"