Fix guessBin to properly detect missing executable

[insign]

The fix rectifies the usage of ExecutableFinder::find in ProcessManager::guessBin. Previously, the method passed a hardcoded string '/usr/bin/rclone' as the default fallback parameter, which meant that when rclone wasn't actually present on the system, the application bypassed the intended RuntimeException check because it evaluated '/usr/bin/rclone' instead of null. This led to a confusing generic error later when the system attempted to execute a path that didn't exist. This commit ensures the correct RuntimeException is thrown gracefully.

Files changed:

• src/ProcessManager.php: Replaced '/usr/bin/rclone' with null when checking for binary presence.

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PR created automatically by Jules for task 4721382692237561927 started by @insign

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