Summary: Picard 3.0.2 Portable crashes when using Plugin Manager repository controls

Environment:

• OS: Windows 11
• Picard: 3.0.2 Portable
• Python: 3.14.8
• PyQt: 6.11.0
• Qt: 6.11.2
• Fresh installation with default settings; no enabled plugins

Steps to reproduce:

1. Launch Picard 3.0.2 Portable.
2. Open Options → Plugins / Plugin Manager.
3. Click Refresh to retrieve the available plugin list, or use the controls for adding a repository URL.
4. Picard immediately terminates without displaying an error.

Expected behavior: Plugin repository information loads or the repository URL dialog opens.

Actual behavior: Complete application termination without an error message. Reproducible on a fresh portable installation.

Windows Event Viewer — Application Error (Event ID 1000):

• Date: 2026-10-22 19:48:00 UTC
• Faulting application: MusicBrainz-Picard-3.0.2.exe
• Application version: 3.0.2.0
• Faulting module: ntdll.dll
• Module version: 10.0.22621.6060
• Exception code: 0xc0000005 (Access Violation)
• Fault offset: 0x0000000000021e98

Additional diagnostics:

• Command-line debugging produces output until the application terminates.
• The debug log shows an attempt to retrieve the plugin registry:
  "https://raw.githubusercontent.com/metabrainz/picard-plugins-registry/refs/heads/main/plugins.toml"
• No Python exception or traceback appears before termination.
• Windows crash dumps are available.

Notes: The failure occurs with multiple Plugin Manager repository controls, suggesting a problem in repository management or related native GUI code