feat: add URL content extraction for AI diagram generation

lib/i18n/dictionaries/zh.json

@@ -51,7 +51,8 @@
         "badResponse": "无帮助",
         "clickToEdit": "点击编辑",
         "editMessage": "编辑消息",
-        "saveAndSubmit": "保存并提交"
+        "saveAndSubmit": "保存并提交",
+        "ExtractURL": "从 URL 提取"
     },
     "examples": {
         "title": "用 AI 创建图表",
@@ -186,6 +187,13 @@
         "chars": "字符",
         "removeFile": "移除文件"
     },
+    "pdf": {
+        "title": "从 URL 提取内容",
+        "description": "粘贴 URL 以提取和分析其内容",
+        "Extracting": "提取中...",
+        "extract": "提取",
+        "Cancel": "取消"
+    },
     "reasoning": {
         "thinking": "思考中...",
         "thoughtFor": "思考了 {duration} 秒",