refactor: extract emitThinkingCompleteIfNeeded to reduce duplication

Extract the shared logic for emitting THINKING_COMPLETE chunk into a
reusable method. This removes code duplication between text-start and
reasoning-end event handlers as suggested in code review.

Signed-off-by: Calvin <calvinvwei@gmail.com>

src/renderer/src/aiCore/chunk/AiSdkToChunkAdapter.ts

@@ -120,6 +120,23 @@ export class AiSdkToChunkAdapter {
     }
   }
 
+  /**
+   * 如果有累积的思考内容，发送 THINKING_COMPLETE chunk 并清空
+   * @param final 包含 reasoningContent 的状态对象
+   * @returns 是否发送了 THINKING_COMPLETE chunk
+   */
+  private emitThinkingCompleteIfNeeded(final: { reasoningContent: string; [key: string]: any }): boolean {
+    if (final.reasoningContent) {
+      this.onChunk({
+        type: ChunkType.THINKING_COMPLETE,
+        text: final.reasoningContent
+      })
+      final.reasoningContent = ''
+      return true
+    }
+    return false
+  }
+
   /**
    * 转换 AI SDK chunk 为 Cherry Studio chunk 并调用回调
    * @param chunk AI SDK 的 chunk 数据
@@ -147,13 +164,7 @@ export class AiSdkToChunkAdapter {
       case 'text-start':
         // 如果有未完成的思考内容，先生成 THINKING_COMPLETE
         // 这处理了某些提供商不发送 reasoning-end 事件的情况
-        if (final.reasoningContent) {
-          this.onChunk({
-            type: ChunkType.THINKING_COMPLETE,
-            text: final.reasoningContent
-          })
-          final.reasoningContent = ''
-        }
+        this.emitThinkingCompleteIfNeeded(final)
         this.onChunk({
           type: ChunkType.TEXT_START
         })
@@ -224,11 +235,7 @@ export class AiSdkToChunkAdapter {
         })
         break
       case 'reasoning-end':
-        this.onChunk({
-          type: ChunkType.THINKING_COMPLETE,
-          text: final.reasoningContent || ''
-        })
-        final.reasoningContent = ''
+        this.emitThinkingCompleteIfNeeded(final)
         break
 
       // === 工具调用相关事件（原始 AI SDK 事件，如果没有被中间件处理） ===