[feat](trx-frontend-http): improve scheduler and decode map controls

Remove settings rig pickers, restore the last scheduler cycle on release, fix FT8 locator role parsing, and add toggleable decode contact paths on the map.

Co-authored-by: OpenAI Codex <codex@openai.com>
Signed-off-by: Stan Grams <sjg@haxx.space>

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

@@ -684,6 +684,13 @@
           <span class="map-locator-filter-label">Search</span>
           <input type="text" id="map-search-filter" class="map-search-input" placeholder="Callsign, MMSI, locator, message..." />
         </div>
+        <div class="map-locator-filter-group">
+          <span class="map-locator-filter-label">Paths</span>
+          <div class="map-locator-phase-row">
+            <button type="button" id="map-contact-paths-toggle" class="map-locator-phase-btn">Contact Paths On</button>
+            <span class="map-locator-empty">Directed FT8 contacts with both locators known</span>
+          </div>
+        </div>
       </div>
       <div id="map-stage">
         <button type="button" id="map-fullscreen-btn" class="map-fullscreen-btn">Fullscreen</button>
@@ -699,9 +706,6 @@
         <div id="scheduler-panel" class="sch-panel">
           <div class="sch-toast" id="scheduler-toast" style="display:none;"></div>
           <div class="sch-row">
-            <label class="sch-label">Rig
-              <select id="scheduler-rig-select" class="status-input sch-rig-select" aria-label="Select rig"></select>
-            </label>
             <label class="sch-label">Mode
               <select id="scheduler-mode-select" class="status-input" aria-label="Scheduler mode">
                 <option value="disabled">Disabled</option>
@@ -805,9 +809,6 @@
           <div class="sch-section">
             <div class="sch-section-title">Configuration</div>
             <div class="sch-row">
-              <label class="sch-label">Rig
-                <select id="background-decode-rig-select" class="status-input sch-rig-select" aria-label="Select rig"></select>
-              </label>
               <label class="sch-label bgd-toggle-wrap">Background decode
                 <span class="bgd-toggle-row">
                   <input type="checkbox" id="background-decode-enabled" />