nomarchy-theme-set chains six optional "tell each app the theme changed"
steps. Each used `command -v X && X || true`, which collapsed two very
different outcomes into the same silent path:
- X isn't installed -> skip (correct, expected, fine)
- X exists but returned non-zero -> skip (wrong - user just got a
half-applied theme with zero feedback about which app didn't refresh)
Replaced the inline guards with a small helper that distinguishes
absent from failed and accumulates real failures into a list. At the
end of the run, if anything failed, we notify-send a single message
naming the apps that didn't refresh ("Did not refresh: Waybar, btop")
and echo the same to stderr. The theme apply itself still completes -
we don't abort the chain on one failure - so the user gets the partial
benefit AND the diagnostic.
Same pattern as the waybar SIGUSR2 fix (386da51): make the hot path
loud about real problems while staying quiet about expected
no-installed states.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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