refactor(view): 배열 업데이트 성능 최적화

groupCommitsByReleaseTags 함수에서 불변성을 유지하면서
배열 업데이트 성능을 개선했습니다.

- slice(0, -1)과 spread operator 중복 사용 제거
- 배열 복사를 1회로 줄여 성능 향상
- 불변성은 slice()를 통해 유지

Author: lee-kyu-hwan

packages/view/src/components/FolderActivityFlow/FolderActivityFlow.releaseAnalyzer.ts

@@ -95,7 +95,7 @@ export function groupCommitsByReleaseTags(clusterNodeList: ClusterNode[]): Relea
 
       // For commits without release tags
       if (acc.lastGroup) {
-        // Add to existing group (maintaining immutability)
+        // Add to existing group (maintaining immutability with optimized array copy)
         const updatedLastGroup: ReleaseGroup = {
           ...acc.lastGroup,
           commits: [...acc.lastGroup.commits, commit],
@@ -106,8 +106,12 @@ export function groupCommitsByReleaseTags(clusterNodeList: ClusterNode[]): Relea
           },
         };
 
+        // Optimized: shallow copy array and replace last element
+        const updatedGroups = acc.groups.slice();
+        updatedGroups[updatedGroups.length - 1] = updatedLastGroup;
+
         return {
-          groups: [...acc.groups.slice(0, -1), updatedLastGroup],
+          groups: updatedGroups,
           lastGroup: updatedLastGroup,
         };
       }

packages/view/src/components/FolderActivityFlow/FolderActivityFlow.type.ts

@@ -35,4 +35,4 @@ export interface ReleaseFlowLineData {
   endReleaseIndex: number;
   endFolder: string;
   contributorName: string;
-}
+}