Fix GPL license references and repo hygiene

.gitignore

@@ -5,6 +5,7 @@ AGENTS.md
 build/
 build-ci/
 build-arch-ci/
+build-dir/
 cmake-build-*/
 
 ## CMake artifacts
@@ -28,6 +29,16 @@ Makefile
 
 ## Runtime files
 *.log
+test-*.json
+
+## Packaging artifacts
+pkg/
+src/bearwave/
+bearwave/
+*.pkg.tar.zst
+*.pkg.tar.zst.sig
+*.pkg.tar.xz
+*.pkg.tar.xz.sig
 
 ## Local caches / user state
 .cache/

README.md

@@ -8,7 +8,7 @@ BearWave is designed for fast station browsing, simple playback controls, favori
 ![Linux](https://img.shields.io/badge/platform-Linux-blue)
 ![KDE Plasma](https://img.shields.io/badge/desktop-KDE%20Plasma-1f6feb)
 ![Qt 6](https://img.shields.io/badge/Qt-6-41cd52)
-![License: MIT](https://img.shields.io/badge/license-MIT-lightgrey)
+![License: GPL--3.0--or--later](https://img.shields.io/badge/license-GPL--3.0--or--later-lightgrey)
 
 ## Screenshots
 
@@ -91,7 +91,7 @@ BearWave intentionally does not aim to be:
 - MPRIS integration for Plasma media controls and media keys
 - system tray integration for background playback
 - desktop notifications for song/track changes with local cover art caching
-- embedded About dialog with links and MIT license text
+- embedded About dialog with links and GNU GPLv3 license text
 
 ## Project Status
 
@@ -330,4 +330,4 @@ For contributor and agent guardrails, see `AGENTS.md`.
 
 ## License
 
-This project is licensed under the MIT License. See [LICENSE](LICENSE) for details.
+This project is licensed under the GNU GPL-3.0-or-later. See [LICENSE](LICENSE) for details.

translations/bearwave_de.ts

@@ -204,8 +204,8 @@
       <translation>LinkedIn öffnen</translation>
     </message>
     <message>
-      <source>MIT License</source>
-      <translation>MIT License</translation>
+      <source>GNU GPLv3 License</source>
+      <translation>GNU GPLv3-Lizenz</translation>
     </message>
     <message>
       <source>Copyright (c) 2026</source>