fix(samples): stop the feedback dialog filling the screen in light mode

[renefloor]

🎯 Goal

In light mode the feedback dialog showed as a large white square covering almost the whole screen, instead of the rounded card it shows in dark mode.

🛠 Implementation details

The dialog wrapped its card in a Scaffold, which fills the dialog's whole area with scaffoldBackgroundColor (backgroundApp). In light mode that is the same white as the card, so the card's edges disappeared; in dark mode it is black like the barrier, so it went unnoticed.

The Scaffold is replaced by a transparent Material, which still gives the text input its Material ancestor.

A dialog that is already open does not follow a light/dark switch. That comes from StreamChat wrapping the route in its own Theme, and is fixed in GetStream/stream-chat-flutter on fix/stream-chat-theme-dialogs.

🎨 UI Changes

Before	After

🧪 Testing

In light and dark mode, open the dialog from the call's ⋮ menu → Provide feedback, and by leaving a call. It shows as a rounded card over the dimmed screen.

☑️Contributor Checklist

General

• Assigned a person / code owner group (required)
• Thread with the PR link started in a respective Slack channel (#flutter-team) (required)
• PR is linked to the GitHub issue it resolves

☑️Reviewer Checklist

• Sample runs & works
• UI Changes correct (before & after images)
• Bugs validated (bugfixes)
• New feature tested and works
• All code we touched has new or updated Documentation

🤖 Generated with Claude Code

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
⚠️ Please upload report for BASE (v2@002747a). Learn more about missing BASE report.

Additional details and impacted files

@@          Coverage Diff          @@
##             v2    #1378   +/-   ##
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  Coverage      ?   37.94%           
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  Files         ?      395           
  Lines         ?    30159           
  Branches      ?        0           
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  Hits          ?    11443           
  Misses        ?    18716           
  Partials      ?        0           

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[xsahil03x]

Is the dialog coming from StreamChat?