Fix missing detail in research step labels for truncated args

Add truncated JSON value extraction fallback so paper search queries
that get cut at 80 chars still show detail text. Add missing operation
labels: citation_graph, snippet_search, recommend.

frontend/src/components/Chat/ToolCallGroup.tsx

@@ -89,9 +89,17 @@ function parseStepArgs(step: string): Record<string, string> {
   } catch {
     // JSON likely truncated — extract key-value pairs via regex
     const result: Record<string, string> = {};
+    // Match complete "key": "value" pairs
     for (const m of jsonStr.matchAll(/"(\w+)":\s*"([^"]*)"/g)) {
       result[m[1]] = m[2];
     }
+    // Match truncated trailing value: "key": "value... (no closing quote)
+    if (Object.keys(result).length === 0 || !result.query) {
+      const trunc = jsonStr.match(/"(\w+)":\s*"([^"]+)$/);
+      if (trunc && !result[trunc[1]]) {
+        result[trunc[1]] = trunc[2];
+      }
+    }
     return result;
   }
 }
@@ -132,6 +140,9 @@ function formatResearchStep(raw: string): { label: string } {
       search: 'Searching papers',
       paper_details: 'Reading paper details',
       read_paper: 'Reading paper',
+      citation_graph: 'Tracing citations',
+      snippet_search: 'Searching paper snippets',
+      recommend: 'Finding related papers',
       find_datasets: 'Finding paper datasets',
       find_models: 'Finding paper models',
       find_collections: 'Finding paper collections',