Make suggestion limit configurable and remove redundant .take(10) from widget

Move hardcoded suggestion limit to kNSIMaxSuggestions in dev_config, and remove
the redundant .take(10) from optionsBuilder since the fetch stage already caps
results.

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

lib/dev_config.dart

@@ -144,6 +144,7 @@ const int kDefaultMaxNodes = 500; // Default maximum number of nodes to render o
 
 // NSI (Name Suggestion Index) configuration
 const int kNSIMinimumHitCount = 500; // Minimum hit count for NSI suggestions to be considered useful
+const int kNSIMaxSuggestions = 10; // Maximum number of tag value suggestions to fetch and display
 
 // Map interaction configuration
 const double kNodeDoubleTapZoomDelta = 1.0; // How much to zoom in when double-tapping nodes (was 1.0)

lib/services/nsi_service.dart

@@ -84,8 +84,7 @@ class NSIService {
         }
       }
       
-      // Limit to top 10 suggestions for UI performance
+      if (suggestions.length >= kNSIMaxSuggestions) break;
-      if (suggestions.length >= 10) break;
     }
     
     return suggestions;

lib/widgets/nsi_tag_value_field.dart

@@ -110,12 +110,9 @@ class _NSITagValueFieldState extends State<NSITagValueField> {
       focusNode: _focusNode,
       optionsBuilder: (TextEditingValue textEditingValue) {
         if (_suggestions.isEmpty) return const Iterable<String>.empty();
-        if (textEditingValue.text.isEmpty) {
+        if (textEditingValue.text.isEmpty) return _suggestions;
-          return _suggestions.take(10);
-        }
         return _suggestions
-            .where((s) => s.contains(textEditingValue.text))
+            .where((s) => s.contains(textEditingValue.text));
-            .take(10);
       },
       onSelected: (String selection) {
         widget.onChanged(selection);