Link takes to specific text blocks

Summary

Allow users to link recorded audio files to specific blocks of text and display different takes side-by-side for comparison.

Recorded takes can be associated with specific script blocks.
Users can compare multiple takes for the same block side-by-side.
The association persists in local browser data without corrupting script source text.
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 df3d068.

What changed:

Recorded take exports now return file metadata back to Blazor when a recording stops or rotates to another block.
Go Live persists take metadata in local browser storage by script/block key, separate from TPS source text.
The recording block cue overlay now shows side-by-side take cards for the active block, including sequential take labels, file name, size, and timestamp.
Added browser coverage for recording two takes of the same block, comparing them side-by-side, and reloading to prove persistence.

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_RecordingBlockTakes_PersistAndCompareSameBlockSideBySide" --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 (1175/1175 passed)

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