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When a user is authenticated as 'rx' role (read-only), disable all TX/PTT control buttons and frequency/mode inputs to prevent accidental attempts to transmit. This provides clear visual feedback that these controls are not available. Controls disabled for rx role: - PTT button - Power button - Lock button - TX Audio button - Frequency input - Mode select - TX Limit input/button - Jog up/down buttons - Jog step buttons Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com> Signed-off-by: Stanislaw Grams <stanislawgrams@gmail.com>