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에러가 생기네요
78, 79 번째줄 text 에서 에러입니다.

에러 메세지는

Running Gradle task 'assembleDebug'...
lib/chat_page.dart:78:63: Error: The getter 'text' isn't defined for the class 'Part'.
 - 'Part' is from 'package:flutter_gemini/src/models/part/part.dart' ('/C:/Users/userpc/AppData/Local/Pub/Cache/hosted/pub.dev/flutter_gemini-3.0.0/lib/src/models/part/part.dart').
Try correcting the name to the name of an existing getter, or defining a getter or field named 'text'.
                    ? HumanMessage(content: chat.parts?.first.text ?? '')
                                                              ^^^^
lib/chat_page.dart:79:60: Error: The getter 'text' isn't defined for the class 'Part'.
 - 'Part' is from 'package:flutter_gemini/src/models/part/part.dart' ('/C:/Users/userpc/AppData/Local/Pub/Cache/hosted/pub.dev/flutter_gemini-3.0.0/lib/src/models/part/part.dart').
Try correcting the name to the name of an existing getter, or defining a getter or field named 'text'.
                    : AIMessage(content: chat.parts?.first.text ?? '');
                                                           ^^^^
Target kernel_snapshot failed: Exception


FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':app:compileFlutterBuildDebug'.
> Process 'command 'C:\flutter\bin\flutter.bat'' finished with non-zero exit value 1

* Try:
> Run with --stacktrace option to get the stack trace.
> Run with --info or --debug option to get more log output.
> Run with --scan to get full insights.

* Get more help at https://help.gradle.org

BUILD FAILED in 4s
Exception: Gradle task assembleDebug failed with exit code 1

혹시

25, 34 번째줄 Parts 에 안쓴다는 줄 쳐졌는데

관계가 있나요

// setState해서 UI를 변경하는 부분
      setState(() {
        chatList = [
          ...chatList,
          // Content(role: 'model', parts: [Parts(text: value?.output)]) //기존 2.x 버전
          Content(role: 'model', parts: [Part.text(value?.output ?? '')]) // 3.x 버전
        ];
      });

itemBuilder: (context, index) {
                final chat = chatList[index];
                Widget messageWidget = chat.role == 'user'
                    ? HumanMessage(content: chat.parts?.first is TextPart ? (chat.parts?.first as TextPart).text : '')
                    : AIMessage(content: chat.parts?.first is TextPart ? (chat.parts?.first as TextPart).text : '');
                return messageWidget;
              },