Receiver.close() nulled its own handle first and only then closed its
paired devices. A paired device's feature_request() sends over the
receiver's handle, so the device.cleanups callbacks that run inside
Device.close() - release RGB SW control, restore onboard-profile mode -
were issued with handle=None, failed, and were silently swallowed. On
every clean Solaar quit a receiver-paired keyboard was left in host
mode; on the G915 TKL that means dead F-keys until a power cycle
(#3266). Wired devices were unaffected: Device.close() already runs
cleanups before clearing its handle, per its own comment.
Close the devices first, then drop the handle, mirroring Device.close().
Also log cleanup write failures in rgb_power.cleanup at debug level
instead of swallowing them silently, so a torn-down transport can't
hide; debug because failures are routine when the device is unplugged.
The regression test fails against the previous ordering.
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