feat: enhance Meteor Scatter with sidebar fixes and visual effects

Move SDR Device below mode title, add sidebar Start/Stop buttons,
and add starfield canvas, meteor streak animations, particle bursts,
signal strength meter, and enhanced ping flash effects.

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

templates/partials/modes/meteor.html

@@ -21,6 +21,13 @@
         </div>
     </div>
 
+    <button class="run-btn" id="meteorSidebarStartBtn" onclick="MeteorScatter.start()">
+        Start Monitoring
+    </button>
+    <button class="stop-btn" id="meteorSidebarStopBtn" onclick="MeteorScatter.stop()" style="display: none;">
+        Stop Monitoring
+    </button>
+
     <div class="section">
         <h3>Capture Settings</h3>
         <div class="form-group">