fix(ios): fix download logs dialog not opening on iOS

[DeckerSU]

Fix issue where the "Download logs" button in Settings was not opening the share dialog on iOS devices.

Changes:

• Migrate from deprecated Share.shareXFiles() to SharePlus.instance.share() API
• Add sharePositionOrigin parameter using scaffoldKey.currentContext for proper iPad support
• Explicitly set mimeType and name parameters for XFile instances
• Add break statements after each case in switch statement (required by Dart)

This ensures the share sheet dialog appears correctly on both iPhone and iPad devices when downloading log files.

[coderabbitai]

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch patch-fix-download-logs-ios

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[github-actions]

Visit the preview URL for this PR (updated for commit 96c1baa):

https://walletrc--pull-3374-merge-j0d9sfsq.web.app

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[gcharang]

can confirm that logs download in the web app continues to work

[CharlVS]

Working on macOS. Thanks!