fix: downgrade TargetClosedError from CRITICAL to WARNING

- initialization: outer exception handler skips CRITICAL for browser-closed errors
- app.py: Application startup failed logs WARNING instead of CRITICAL for browser-closed
- model_management: UI state errors log DEBUG instead of ERROR for browser-closed

Author: maebahesioru

src/api/app.py

@@ -175,7 +175,10 @@ async def lifespan(app: FastAPI):
         server.is_initializing = False
         yield
     except Exception as e:
-        logger.critical(f'Application startup failed: {e}', exc_info=True)
+        if 'Target page, context or browser has been closed' in str(e):
+            logger.warning(f'Application startup failed (browser closed): {e}')
+        else:
+            logger.critical(f'Application startup failed: {e}', exc_info=True)
         await _shutdown_resources()
         raise RuntimeError(f'Application startup failed: {e}') from e
     finally:

src/browser/initialization.py

@@ -347,16 +347,21 @@ async def _initialize_page_logic(browser: AsyncBrowser):
             logger.error(f'页面初始化失败：核心输入区域未在预期时间内变为可见。最后的 URL 是 {found_page.url}', exc_info=True)
             raise RuntimeError(f'页面初始化失败：核心输入区域未在预期时间内变为可见。最后的 URL 是 {found_page.url}') from input_visible_err
     except Exception as e_init_page:
-        logger.critical(f'❌ 页面逻辑初始化期间发生严重意外错误: {e_init_page}', exc_info=True)
+        is_browser_closed = 'Target page, context or browser has been closed' in str(e_init_page)
+        if is_browser_closed:
+            logger.warning(f'页面初始化时浏览器已关闭: {e_init_page}')
+        else:
+            logger.critical(f'❌ 页面逻辑初始化期间发生严重意外错误: {e_init_page}', exc_info=True)
         if temp_context:
             try:
                 logger.info(f'   尝试关闭临时的浏览器上下文 due to initialization error.')
                 await temp_context.close()
                 logger.info('   ✅ 临时浏览器上下文已关闭。')
             except Exception as close_err:
-                logger.warning(f'   ⚠️ 关闭临时浏览器上下文时出错: {close_err}')
-        from .operations import save_error_snapshot
-        await save_error_snapshot('init_unexpected_error')
+                logger.debug(f'   关闭临时浏览器上下文时出错: {close_err}')
+        if not is_browser_closed:
+            from .operations import save_error_snapshot
+            await save_error_snapshot('init_unexpected_error')
         raise RuntimeError(f'页面初始化意外错误: {e_init_page}') from e_init_page
 
 async def _close_page_logic():

src/browser/model_management.py

@@ -29,7 +29,10 @@ async def _verify_ui_state_settings(page: AsyncPage, req_id: str='unknown') -> d
             logger.error(f'[{req_id}] ❌ 解析localStorage JSON失败: {e}')
             return {'exists': False, 'isAdvancedOpen': None, 'areToolsOpen': None, 'needsUpdate': True, 'error': f'JSON解析失败: {e}'}
     except Exception as e:
-        logger.error(f'[{req_id}] ❌ 验证UI状态设置时发生错误: {e}')
+        if 'Target page, context or browser has been closed' in str(e):
+            logger.debug(f'[{req_id}] UI状态验证时浏览器已关闭')
+        else:
+            logger.error(f'[{req_id}] ❌ 验证UI状态设置时发生错误: {e}')
         return {'exists': False, 'isAdvancedOpen': None, 'areToolsOpen': None, 'needsUpdate': True, 'error': f'验证失败: {e}'}
 
 async def _force_ui_state_settings(page: AsyncPage, req_id: str='unknown') -> bool:
@@ -84,7 +87,10 @@ async def _force_ui_state_settings(page: AsyncPage, req_id: str='unknown') -> bo
             return False
 
     except Exception as e:
-        logger.error(f'[{req_id}] ❌ 强制设置UI状态错误: {e}')
+        if 'Target page, context or browser has been closed' in str(e):
+            logger.debug(f'[{req_id}] 强制设置UI时浏览器已关闭')
+        else:
+            logger.error(f'[{req_id}] ❌ 强制设置UI状态错误: {e}')
         return False
 
 async def _force_ui_state_with_retry(page: AsyncPage, req_id: str='unknown', max_retries: int=3, retry_delay: float=1.0) -> bool: