bulb: `on` waits up to 30 s for the gateway

The bulb stayed off after a resume while the LED strip came back.
hypridle's after_sleep_cmd runs `udt-bulb on` the moment the resume
finishes, and the wired link only came up 4 s later (16:52:22 resume,
16:52:26 eth0 carrier in the log). A request sent before that fails at
once, and udt-bulb gave up after one try; the strip survived because a
failed cached address makes it listen for its broadcast for up to 20 s.

`on` now polls the first bulb every 2 s until the gateway answers, for
up to 30 s, which also covers the same race at login. `off` still makes
a single attempt, since it runs as the session ends and cannot wait.

The cause is read from timing, not observed: nothing logs what the
after_sleep_cmd did. The next resume confirms it.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

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