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* AM: add opt-in channel-power squelch for AM audio RX Add an SDR++-style power squelch on the complex channel signal for the Analog Audio RX app in AM modes (DSB/SSB/CW). The squelch measures the mean channel power, converts it to dBFS, and mutes the demodulated audio when the signal is below a user-set threshold. Being carrier-based it keys on the AM carrier (e.g. airband/ATC) rather than on audio-band noise, which the existing FM squelch could not do for AM. A new 'SQ' field (0-99, 0 = off) is added to the AM options view and is persisted per app via app_settings. Default is 0, so existing AM behaviour is unchanged unless the user enables it. Threshold maps 1..99 to -80..-20 dBFS. Touches: message (AMConfigureMessage.squelch_level), baseband_api (AMConfig::apply), receiver_model (am_squelch_level get/set), app_settings (persistence), proc_am_audio (DSP), analog_audio_app (UI). * Refactor audio power calculation to use magnitude squared Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com> --------- Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>