grep/glob return no presentResult on an error result, so an errored search had
no card and the keyed SearchRow showed only a red dot — the model-facing error
text (bad pattern, missing path, a nested run_code dispatch with no card) was
nowhere on screen. Add an error-text arm mirroring the file-mutation and read
rows. Added tests for the text arm and its name/code fallback. The unknown-kind
fallback in search-card-model is already guarded (returns null → generic path).
6608ede1a0