fix: generateDocument 반환값 불일치 + documents undefined 방어

ipcSuccess(doc)가 MeetingDocument를 직접 반환하는데 UI에서
resp.data.document로 접근하여 undefined 크래시.
resp.data로 직접 접근하도록 수정. preload 타입도 수정.

src/preload/index.ts

@@ -623,7 +623,7 @@ const electronAPI = {
     updateTranscript: (params: MeetingUpdateTranscriptParams) =>
       invoke<void>(IPC_CHANNELS.MEETING_MODE.UPDATE_TRANSCRIPT, params),
     generateDocument: (params: MeetingGenerateDocParams) =>
-      invoke<MeetingGenerateDocResult>(IPC_CHANNELS.MEETING_MODE.GENERATE_DOCUMENT, params),
+      invoke<MeetingDocument>(IPC_CHANNELS.MEETING_MODE.GENERATE_DOCUMENT, params),
     getDocuments: (params: MeetingGetDocsParams) =>
       invoke<MeetingDocument[]>(IPC_CHANNELS.MEETING_MODE.GET_DOCUMENTS, params),
     updateDocument: (params: MeetingUpdateDocParams) =>

src/renderer/components/meeting/MeetingDetailTabs.tsx

@@ -188,7 +188,7 @@ export function MeetingDetailTabs({
       })
       setGenerating(false)
       if (resp.success) {
-        const newDoc = resp.data.document
+        const newDoc = resp.data
         setDocuments((prev) => {
           // 새 문서 탭으로 이동: 전사(0) + 기존문서수 + 1
           setTabIndex(prev.length + 1)
@@ -308,8 +308,9 @@ export function MeetingDetailTabs({
             onSaveTranscript={handleSaveTranscript}
           />
         )}
-        {documents.map((doc, idx) =>
-          tabIndex === idx + 1 ? (
+        {documents.filter(Boolean).map((doc, idx) => {
+          if (!doc || tabIndex !== idx + 1) return null
+          return (
             <DocumentTab
               key={doc.id}
               document={doc}
@@ -317,8 +318,8 @@ export function MeetingDetailTabs({
               onExport={(format) => handleExportDocument(doc.id, format)}
               onDelete={() => handleDeleteDocument(doc.id)}
             />
-          ) : null,
-        )}
+          )
+        })}
       </Box>
 
       {/* AI 채팅 패널 */}