fix(app) fix PlatformException crash when exporting device diagnostics

[krushnarout]

Summary

• ShareParams in _exportDiagnostics was missing a title, causing share_plus to throw PlatformException(error, Non-empty title expected, null, null) on iOS every time a user tapped the export button on the Device Diagnostics screen.
• Fix: pass title: 'Omi Device Diagnostics' alongside the existing subject.

Crash

Fatal Exception: FlutterError
PlatformException(error, Non-empty title expected, null, null)
package:share_plus_platform_interface/method_channel/method_channel_share.dart:25

0  StandardMethodCodec.decodeEnvelope  (message_codecs.dart:653)
1  MethodChannel._invokeMethod          (platform_channel.dart:367)
2  MethodChannelShare.share             (method_channel_share.dart:25)
3  _DeviceDiagnosticsState._exportDiagnostics (device_diagnostics.dart:123)

Crashlytics: https://console.firebase.google.com/u/0/project/based-hardware/crashlytics/app/ios:com.friend-app-with-wearable.ios12/issues/40d960fea757d7ea8a9d0c02bec36346

Test plan

• Open Device Diagnostics page and tap the export (share) button — verify the native share sheet opens without crashing

🤖 Generated with Claude Code

[cubic-dev-ai]

No issues found across 1 file

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