Handle Nuitka builds without sys.frozen

[boggedbrush]

Summary

• detect frozen Nuitka environments via dedicated helper and reuse cached base directory resolution outside temporary folders
• normalize temporary path comparisons and reuse the resolved application path when accessing settings
• allow bundled resource lookup when running from Nuitka builds without sys.frozen

Testing

• python -m compileall main.py

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https://chatgpt.com/codex/tasks/task_e_68f15fb50c70832992157dce080de194