[feat](trx-frontend-http): refine responsive main and map layout

Adjust responsive behavior and interaction details in the HTTP frontend.\n\n- switch signal measurement from sample-based to time-based averaging\n- move Transmit/Power below Mode+Tune on small viewports\n- add practical mobile breakpoints and width handling\n- resize and tune logo/top spacing/layout placement\n- make map height viewport-aware with adjustable minimum\n- improve FT8/WSPR control wrapping on small screens\n\nCo-authored-by: OpenAI Codex <codex@openai.com>

Signed-off-by: Stanislaw Grams <stanislawgrams@gmail.com>

src/trx-client/trx-frontend/trx-frontend-http/assets/web/index.html

@@ -61,7 +61,7 @@
             <button id="jog-up" type="button" class="jog-btn">+</button>
           </div>
         </div>
-        <div class="controls-col">
+        <div class="controls-col controls-col-power">
           <div class="label">Transmit / Power</div>
           <div class="btn-grid">
             <button id="ptt-btn" type="button">Toggle PTT</button>