Crash when opening Settings with empty Bible versions

[AbleToCode]

Opening Edit -> Settings can terminate the app immediately.

Repro:

1. Start SoftProjector
2. Click Edit -> Settings
3. Process exits abnormally

Root cause:
If BibleVersions is empty, Settings initialization reaches Bible selector rebuild logic and attempts list removal with an invalid index (-1). This triggers an out-of-range abort in Qt container operations.

Expected:
Settings dialog must open safely even when no Bible versions exist, with fallback/disabled Bible selectors.

[AbleToCode]

fixed