The useEffect that syncs selectedFile was resetting to an existing file
whenever the selected path wasn't in the bundle's on-disk file list.
This prevented selecting the entry file (e.g. AGENTS.md) when it didn't
yet exist on disk, even though it was visible in the file tree.
Allow selecting the currentEntryFile even when it has no on-disk file.
Co-Authored-By: Paperclip <noreply@paperclip.ing>
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