Add WeFax start button feedback and auto-capture scheduler

Fix silent failure when starting without station/frequency selected by
flashing amber on status text and dropdowns. Add auto-capture scheduler
that uses fixed UTC broadcast schedules from station data to
automatically start/stop WeFax decoding at broadcast times.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

templates/index.html

@@ -2545,6 +2545,11 @@
                             </div>
                             <button class="wefax-strip-btn start" id="wefaxStartBtn" onclick="WeFax.start()">Start</button>
                             <button class="wefax-strip-btn stop" id="wefaxStopBtn" onclick="WeFax.stop()" style="display: none;">Stop</button>
+                            <label class="wefax-schedule-toggle" title="Auto-capture broadcasts">
+                                <input type="checkbox" id="wefaxStripAutoSchedule"
+                                       onchange="WeFax.toggleScheduler(this)">
+                                <span>Auto</span>
+                            </label>
                         </div>
                         <div class="wefax-strip-divider"></div>
                         <div class="wefax-strip-group">

templates/partials/modes/wefax.html

@@ -50,6 +50,18 @@
         </div>
     </div>
 
+    <div class="section">
+        <h3>Auto Capture</h3>
+        <div class="form-group" style="display: flex; align-items: center; gap: 8px;">
+            <input type="checkbox" id="wefaxSidebarAutoSchedule"
+                   onchange="WeFax.toggleScheduler(this)">
+            <label for="wefaxSidebarAutoSchedule" style="margin: 0; cursor: pointer;">Auto-capture scheduled broadcasts</label>
+        </div>
+        <p class="info-text" style="font-size: 11px; color: var(--text-dim); margin-top: 4px;">
+            Automatically decode at scheduled broadcast times.
+        </p>
+    </div>
+
     <!-- Antenna Guide -->
     <div class="section">
         <h3>HF Antenna Guide</h3>