ui: fix icons, button stylings

lib/features/floorplan/floor_plan_screen.dart

@@ -520,7 +520,7 @@ class _TrackingCard extends StatelessWidget {
         padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 10),
         child: Row(
           children: [
-            const Icon(Icons.label_outline),
+            const Icon(Icons.label),
             const SizedBox(width: 10),
             Expanded(
               child: Column(

lib/features/tags/tag_detail_sheet.dart

@@ -178,7 +178,7 @@ class _TagDetailSheetState extends ConsumerState<TagDetailSheet> {
                     value: _formatLastSeen(tag.lastSeen!),
                   ),
                 const SizedBox(height: 24),
-                FilledButton.tonal(
+                OutlinedButton.icon(
                   onPressed: () {
                     final isTracking = trackedTag?.tagId == tag.tagId;
                     ref.read(trackedTagProvider.notifier).state = isTracking
@@ -189,22 +189,16 @@ class _TagDetailSheetState extends ConsumerState<TagDetailSheet> {
                       GoRouter.of(context).go('/floorplan');
                     }
                   },
-                  child: Row(
+                  icon: Icon(
-                    mainAxisAlignment: MainAxisAlignment.center,
-                    children: [
-                      Icon(
                     trackedTag?.tagId == tag.tagId
-                            ? Icons.radar
+                        ? Icons.blur_off
-                            : Icons.radar_outlined,
+                        : Icons.blur_on,
                   ),
-                      const SizedBox(width: 8),
+                  label: Text(
-                      Text(
                     trackedTag?.tagId == tag.tagId
                         ? 'Hide particle cloud'
                         : 'View particle cloud',
                   ),
-                    ],
-                  ),
                 ),
                 const SizedBox(height: 8),
                 TextButton(