fix: enable horizontal scroll in entity lookup and increase timeout to 120s

Replace Radix ScrollArea with plain overflow-auto div to allow nested
horizontal scrolling in lookup result tables. Add overflow-auto to
table containers. Increase per-database search timeout from 30s to 120s.

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

src-tauri/src/commands/lookup.rs

@@ -49,7 +49,7 @@ async fn search_database(
     };
 
     let result = tokio::time::timeout(
-        std::time::Duration::from_secs(30),
+        std::time::Duration::from_secs(120),
         search_database_inner(&pool, database, column_name, value),
     )
     .await;
@@ -65,7 +65,7 @@ async fn search_database(
         Err(_) => LookupDatabaseResult {
             database: database.to_string(),
             tables: vec![],
-            error: Some("Timeout (30s)".to_string()),
+            error: Some("Timeout (120s)".to_string()),
             search_time_ms: start.elapsed().as_millis(),
         },
     }