feat: update codex live chat workflow

src/features/planBoard/PlanBoardPage.tsx

@@ -2,7 +2,10 @@ import {
   ArrowLeftOutlined,
   CloseOutlined,
   CopyOutlined,
+  DownloadOutlined,
   DownOutlined,
+  FullscreenExitOutlined,
+  FullscreenOutlined,
   UpOutlined,
 } from '@ant-design/icons';
 import {
@@ -2510,6 +2513,7 @@ export function WorklogEvidenceTab({
   const [worklogContents, setWorklogContents] = useState<Record<string, string>>({});
   const [loading, setLoading] = useState(false);
   const [previewModalItem, setPreviewModalItem] = useState<EvidenceAttachmentItem | null>(null);
+  const [isPreviewModalExpanded, setIsPreviewModalExpanded] = useState(false);
 
   async function handleCopyText(text: string) {
     try {
@@ -2642,10 +2646,13 @@ export function WorklogEvidenceTab({
         open={Boolean(previewModalItem)}
         title={previewModalItem?.title ?? 'Preview'}
         footer={null}
-        width={1120}
-        rootClassName="plan-board-page__evidence-modal"
+        width={isPreviewModalExpanded ? 'calc(100vw - 32px)' : 1120}
+        rootClassName={`plan-board-page__evidence-modal${
+          isPreviewModalExpanded ? ' plan-board-page__evidence-modal--expanded' : ''
+        }`}
         onCancel={() => {
           setPreviewModalItem(null);
+          setIsPreviewModalExpanded(false);
         }}
         closeIcon={<CloseOutlined />}
       >
@@ -2660,18 +2667,30 @@ export function WorklogEvidenceTab({
                   onClick={() => void handleCopyText(previewModalItem.value)}
                 />
                 {previewModalItem.linkUrl ? (
-                  <Button type="link" href={previewModalItem.linkUrl} target="_blank" rel="noreferrer">
-                    링크 열기
-                  </Button>
+                  <Button
+                    aria-label="다운로드"
+                    icon={<DownloadOutlined />}
+                    href={previewModalItem.linkUrl}
+                    target={previewModalItem.kind === 'preview' ? '_blank' : undefined}
+                    rel={previewModalItem.kind === 'preview' ? 'noreferrer' : undefined}
+                    download={previewModalItem.kind === 'preview' ? undefined : true}
+                  />
                 ) : null}
                 <Button
+                  aria-label={isPreviewModalExpanded ? '최대화 해제' : '최대화'}
+                  icon={isPreviewModalExpanded ? <FullscreenExitOutlined /> : <FullscreenOutlined />}
+                  onClick={() => {
+                    setIsPreviewModalExpanded((previous) => !previous);
+                  }}
+                />
+                <Button
+                  aria-label="닫기"
                   icon={<CloseOutlined />}
                   onClick={() => {
                     setPreviewModalItem(null);
+                    setIsPreviewModalExpanded(false);
                   }}
-                >
-                  닫기
-                </Button>
+                />
               </Space>
             </Flex>
             <div className="plan-board-page__evidence-modal-body">