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.

tests/test_happ_theme.sh

@@ -0,0 +1,27 @@
+#!/bin/bash
+set -euo pipefail
+
+script_dir="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+repo_root="$(cd "${script_dir}/.." && pwd)"
+launcher="${repo_root}/happ/happ-launcher"
+staplerfile="${repo_root}/happ/Staplerfile"
+tmp_dir="$(mktemp -d)"
+trap 'rm -r -- "$tmp_dir"' EXIT
+
+cp "$launcher" "${tmp_dir}/launcher-env"
+sed -i 's|/opt/happ/bin/Happ|/usr/bin/env|' "${tmp_dir}/launcher-env"
+
+default_env="$(env -u QT_QPA_PLATFORMTHEME "${tmp_dir}/launcher-env")"
+grep -qx 'QT_QPA_PLATFORMTHEME=xdgdesktopportal' <<<"$default_env"
+
+custom_env="$(QT_QPA_PLATFORMTHEME=qt6ct "${tmp_dir}/launcher-env")"
+grep -qx 'QT_QPA_PLATFORMTHEME=qt6ct' <<<"$custom_env"
+
+cp "$launcher" "${tmp_dir}/launcher-args"
+sed -i 's|/opt/happ/bin/Happ|/usr/bin/printf|' "${tmp_dir}/launcher-args"
+forwarded="$("${tmp_dir}/launcher-args" '%s:%s' first second)"
+[[ "$forwarded" == 'first:second' ]]
+
+grep -Fq "sed -i 's|^Exec=/opt/happ/bin/Happ|Exec=/usr/bin/happ|'" "$staplerfile"
+
+echo 'OK: launcher Happ использует системную тему через XDG Desktop Portal'