A desktop launcher gives the app a minimal PATH (e.g. /usr/bin:/bin) with
no ~/.local/bin, where pql installs — so _findOnPath('pql') returned null,
clide spawned the literal 'pql', and Process.start failed with ENOENT;
the pql pane errored. The PATH re-expansion that re-adds ~/.local/bin +
/usr/local/bin ran on macOS only; Linux GUI launches hit the same wall.
Extend it to Linux (homebrew dirs stay macOS-only). Extract the logic
into a pure expandToolPath() so the platform gating is unit-tested.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>