* feat(audio): use device default sample rate and always downsample
instead of forcing the microphone to open at 16kHz (which can cause
issues with bluetooth codecs, some ALSA drivers, and other devices
that advertise 16kHz support but produce suboptimal audio), use the
device's native/default sample rate and let the existing FrameResampler
downsample to 16kHz for the whisper pipeline.
the resampling infrastructure (rubato FftFixedIn) already exists in
run_consumer() and short-circuits when in_hz == out_hz, so devices
that natively default to 16kHz are unaffected.
* fix: graceful fallback when supported_input_configs fails
some ALSA/PipeWire drivers support default_input_config but have
a broken supported_input_configs implementation. fall back to the
default config instead of propagating the error. also add a warn
log when no config matches the device's default rate.
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