feat: Weather satellite and ADS-B trail rendering improvements

Weather Satellite:
- Fix duplicate event listeners on mode re-entry via locationListenersAttached guard
- Add suspend() to stop countdown/SSE stream when switching away from the mode
- Call WeatherSat.suspend() in switchMode() when leaving weathersat
- Fix toggleScheduler() to take the checkbox element as source of truth,
  preventing both checkboxes fighting each other
- Reset isRunning/UI state after auto-capture completes (scheduler path)
- Always re-select first pass and reset selectedPassIndex after loadPasses()
- Keep timeline cursor in sync inside selectPass()
- Add seconds to pass ID format to avoid collisions on concurrent passes
- Improve predict_passes() comment clarity; fix trajectory comment

ADS-B dashboard:
- Batch altitude-colour trail segments into runs of same-colour polylines,
  reducing Leaflet layer count from O(trail length) to O(colour changes)
  for significantly better rendering performance with many aircraft

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

templates/partials/modes/weather-satellite.html

@@ -1,15 +1,15 @@
 <!-- WEATHER SATELLITE MODE -->
-<div id="weatherSatMode" class="mode-content">
-    <div class="section">
-        <h3>Weather Satellite Decoder</h3>
-        <div class="alpha-mode-notice">
-            ALPHA: Weather Satellite capture is experimental and may fail depending on SatDump version, SDR driver support, and pass conditions.
-        </div>
-        <p class="info-text" style="font-size: 11px; color: var(--text-dim); margin-bottom: 12px;">
-            Receive and decode weather images from NOAA and Meteor satellites.
-            Uses SatDump for live SDR capture and image processing.
-        </p>
-    </div>
+<div id="weatherSatMode" class="mode-content">
+    <div class="section">
+        <h3>Weather Satellite Decoder</h3>
+        <div class="alpha-mode-notice">
+            ALPHA: Weather Satellite capture is experimental and may fail depending on SatDump version, SDR driver support, and pass conditions.
+        </div>
+        <p class="info-text" style="font-size: 11px; color: var(--text-dim); margin-bottom: 12px;">
+            Receive and decode weather images from NOAA and Meteor satellites.
+            Uses SatDump for live SDR capture and image processing.
+        </p>
+    </div>
 
     <div class="section">
         <h3>Satellite</h3>
@@ -226,7 +226,7 @@
         </p>
         <div class="form-group">
             <label style="display: flex; align-items: center; gap: 6px;">
-                <input type="checkbox" id="wxsatSidebarAutoSchedule" onchange="WeatherSat.toggleScheduler()" style="width: auto;">
+                <input type="checkbox" id="wxsatSidebarAutoSchedule" onchange="WeatherSat.toggleScheduler(this)" style="width: auto;">
                 Enable Auto-Capture
             </label>
         </div>