flutter: QR widget cleanup + SharePlus usage in invite dialog

[zensgit]

• Remove placeholder stubs and fix const eval in qr_code_generator.dart
• Use SharePlus.instance.share(ShareParams) in InvitationQrCodeDialog
• Keep QrImageView (qr_flutter) and clean structure

Analyzer: no hard errors. Tests: all green (14/14).

[gemini-code-assist]

Summary of Changes

Hello @zensgit, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request refines the QR code generation and sharing capabilities within the application. It focuses on removing unnecessary placeholder code related to QR image display and modernizing the sharing mechanism by integrating the SharePlus package, specifically for the invitation dialog. These changes aim to streamline the codebase and enhance the sharing experience.

Highlights

• QR Widget Cleanup: Removed placeholder stub methods for XFile and QrImageView in qr_code_generator.dart, and corrected a const evaluation issue for CircularProgressIndicator.
• SharePlus Integration: Updated the InvitationQrCodeDialog to utilize SharePlus.instance.share(ShareParams) for sharing invitation details, replacing the previous Share.share method.

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[Copilot]

Pull Request Overview

This PR cleans up the QR widget implementation by removing placeholder stub code and updates the sharing functionality to use SharePlus API. The changes eliminate temporary development stubs and implement proper external dependencies.

• Removed placeholder stub methods and classes that were used during development
• Updated sharing functionality to use SharePlus.instance.share(ShareParams) instead of Share.share()
• Fixed const evaluation issue with CircularProgressIndicator widget

---

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[Copilot]

The ShareParams constructor call spans multiple lines but is missing proper parameter naming. Consider using named parameter 'text:' explicitly and proper formatting for better readability.

Suggested change

	await SharePlus.instance.share(ShareParams(text:
	'邀请你加入家庭「$familyName」\n\n'
	await SharePlus.instance.share(ShareParams(
	text: '邀请你加入家庭「$familyName」\n\n'

[gemini-code-assist]

Code Review

This pull request provides some nice cleanups to the qr_code_generator.dart file. It removes placeholder stub code, fixes a minor const evaluation issue, and updates the sharing functionality in the InvitationQrCodeDialog to use the more modern SharePlus.instance.share API. The changes are clear and improve the code quality. I have one suggestion to further improve the readability of the sharing logic.

[gemini-code-assist]

For better readability, it's a good practice to extract the multi-line string into a separate variable before passing it to the share method. This makes the code cleaner and easier to understand.

                    onPressed: () async {
                      final shareText = '邀请你加入家庭「$familyName」\n\n'
                          '邀请码：$inviteCode\n'
                          '点击链接加入：$inviteLink\n\n'
                          '有效期：$daysLeft 天';
                      await SharePlus.instance.share(ShareParams(text: shareText));
                    },