feat: Enhance dashboard with filtering options and sync SLM status

- Added a new filtering system to the dashboard for device types and statuses.
- Implemented asynchronous SLM status synchronization to update the Emitter table.
- Updated the status snapshot endpoint to sync SLM status before generating the snapshot.
- Refactored the dashboard HTML to include filter controls and JavaScript for managing filter state.
- Improved the unit detail page to handle modem associations and cascade updates to paired devices.
- Removed redundant code related to syncing start time for measuring devices.

templates/roster.html

@@ -1154,11 +1154,20 @@
         });
     }
 
+    // Check if any modal is currently open
+    function isAnyModalOpen() {
+        const modalIds = ['addUnitModal', 'editUnitModal', 'renameUnitModal', 'importModal', 'quickCreateProjectModal'];
+        return modalIds.some(id => {
+            const modal = document.getElementById(id);
+            return modal && !modal.classList.contains('hidden');
+        });
+    }
+
     document.addEventListener('DOMContentLoaded', function() {
         // Auto-refresh device list every 30 seconds (increased from 10s to reduce flicker)
         setInterval(() => {
             const deviceContent = document.getElementById('device-content');
-            if (deviceContent && !document.querySelector('.modal:not(.hidden)')) {
+            if (deviceContent && !isAnyModalOpen()) {
                 // Only auto-refresh if no modal is open
                 refreshDeviceList();
             }