Windows: Fladder hangs on startup after aborting Auth Link login

[feelgood-17]

Description

Environment

• Fladder: 0.10.3
• OS: Windows 11
• Portable version

Steps to reproduce

1. Start Fladder.
2. Open an authentication link (fladder:///login?authLink=...).
3. The login dialog is displayed.
4. Close Fladder before completing the login (without entering the password).
5. Launch Fladder again.

Expected behavior

Fladder should either:

• return to the login screen, or
• discard the incomplete authentication state.

Actual behavior

Fladder becomes unresponsive immediately after startup ("Not Responding").

Workaround

Deleting or renaming:

%APPDATA%\DonutWare

allows Fladder to start normally again.

Additional notes

The issue appears to be caused by an incomplete authentication state being restored on startup.

I can reproduce this consistently.

I initially suspected customCacheKey.json, but deleting the whole %APPDATA%\DonutWare directory consistently fixes the issue. I haven't yet identified which specific file stores the incomplete authentication state.

Reproduction steps

1. Start Fladder.
2. Open an authentication link (fladder:///login?authLink=...).
3. The login dialog is displayed.
4. Close Fladder before completing the login (without entering the password).
5. Launch Fladder again.

Screenshots

No response

Logs

Platform

Windows

App Version

0.10.3

Jellyfin server

10.11.10