CodeRabbit on #2689:
- `unavailable` used `exists()` / `is_dir()`, which are false for any
error: a parent folder that can't be read or a share that timed out came
out as "Not found" and greyed the entry out. Only an absent path is "not
found" now; other lookup errors are "This library couldn't be checked:
<reason>" (LookupFailed), and a folder that refuses to be listed is no
longer counted as missing either (it is there: permissions, macOS
privacy), so neither is greyed out and opening says why.
- Every recent library was checked again every 30 s while the app ran,
waking external drives and network shares. A library not found is looked
for again every 30 s (a drive plugged back in; an absent path wakes
nothing); the others only when the window comes back to the front, for
the 8 entries shown; paths never checked are checked once.
Tests a_failed_lookup_doesnt_mark_a_recent_library_missing and
recent_libraries_are_checked_again_only_when_the_window_comes_back fail with
the old lookup / the old timer / no timer for libraries not found.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
