Add local recording buttons

Summary

Prioritize local recording by adding native buttons to record audio and video directly within the app.

The app exposes clear local audio/video recording controls in the relevant workflow.
Recording remains browser-local and does not imply external streaming or cloud storage.
Permission, active, stopped, and unavailable states are visible to the user.
Add or update browser/UI test coverage for the relevant user flow.
Solution tests pass before the issue is marked ready for user verification.

Implemented and pushed to main in commit 5cf1aa1.

What changed:

Added a dedicated Local recording control block in the Go Live Stream tab.
Exposed separate Video and Audio local recording buttons/statuses that drive the browser-local MediaRecorder path.
The controls show stopped, recording, and unavailable states, plus explicit browser-local/no stream/no cloud copy.
Added component and browser coverage for toggling recording through the local controls and verifying state transitions.

Verification passed:

dotnet build ./PrompterOne.slnx -warnaserror --no-restore
dotnet test --project tests/PrompterOne.Web.Tests/PrompterOne.Web.Tests.csproj --no-build -- --treenode-filter "/*/*/GoLiveSessionInteractionTests/*" --no-ansi --no-progress
dotnet test --project tests/PrompterOne.Web.UITests.Studio/PrompterOne.Web.UITests.Studio.csproj --no-build -- --treenode-filter "/*/*/GoLiveShellSessionFlowTests/GoLivePage_LocalRecordingControls_ToggleBrowserLocalRecordingStates" --no-ansi --no-progress
dotnet test --project tests/PrompterOne.Web.Tests/PrompterOne.Web.Tests.csproj --no-build -- --no-ansi --no-progress
dotnet test --project tests/PrompterOne.Web.UITests.Studio/PrompterOne.Web.UITests.Studio.csproj --no-build -- --no-ansi --no-progress
dotnet test @./tests/dotnet-test-progress.rsp --solution ./PrompterOne.slnx (1177/1177 passed)

Please review when ready. I left the issue open for your verification.

this is supposed to be added in the prompter view.

issues like this will keep happening until we clearly define the different screens and modes. there's too much stuff going on now.