Fix frozen-build SSL certs, taskbar icon, and rename _internal to psp-preserve

- config: point SSL at certifi bundle when frozen (fixes store/NPS/TMDB SSL errors)
- gui: set app name + window icon for the taskbar
- spec: contents_directory=psp-preserve; bundle a .desktop file for Wayland launchers

app/gui.py

@@ -5679,10 +5679,13 @@ def main():
     log.info("starting psp-preserve (db: %s)", config.DB_PATH)
     app = QApplication(sys.argv)
     style.apply_theme(app)
+    app.setApplicationName("PSP Preservation Tool")
+    app.setDesktopFileName("psp-preserve")
     icon_path = config.PROJECT_ROOT / "img" / "app-icon.png"
     if icon_path.is_file():
         app.setWindowIcon(QIcon(str(icon_path)))
     window = MainWindow()
+    window.setWindowIcon(app.windowIcon())
     window.show()
     log.info("main window ready")
     threading.Thread(target=_start_bundle_check, args=(window,), daemon=True).start()