Refine main control interactions and presentation in the HTTP frontend.\n\n- remove frequency and mode Set buttons\n- apply mode changes immediately on picker change\n- place Mode/Tune/Transmit-Power controls in one horizontal row\n- align control labels vertically across that row\n- move and enlarge MHz/kHz/Hz selector beside frequency input\n- keep Enter-to-set frequency behavior\n- switch signal measurement to elapsed-time averaging\n- enlarge header logo 2x\n\nCo-authored-by: OpenAI Codex <codex@openai.com>
Signed-off-by: Stanislaw Grams <stanislawgrams@gmail.com>
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