Replaced all 46 bare 'except:' across the package with specific exception
types, and logged the cases that indicate a real problem:
- config load/save: FileNotFoundError is the silent first-run case; other
OSError/ValueError/UnicodeDecodeError are logged.
- ffprobe/avprobe: JSON parse failures are now logged (previously a media
file that ffprobe couldn't read just silently failed to import); decode
fallbacks -> UnicodeDecodeError; duration parse -> ValueError/TypeError/
KeyError; install check -> OSError/SubprocessError.
- executor: pre_/post_function and progress-polling hooks now use hasattr
checks, and a real exception inside a defined hook is logged instead of
swallowed; decode fallbacks and numeric parses narrowed.
- best-effort filesystem ops (makedirs/unlink) -> OSError.
- all backend check_is_installed probes -> OSError/SubprocessError.
- shutdown: also fixes a latent NameError ('failure' was only set in the
except branch, so a successful logind PowerOff would crash the handler).
No bare 'except:' remain. Full suite (51 tests) green; GUI starts clean.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
6b624a72cd