Patch release with fixed styles affecting other extensions, causing issues such as broken progress bars in Hangfire.Throttling.

• Fixed – Batch styles in Dashboard UI are now isolated and do not affect other extensions.
• Fixed – AwaitingBatch state accent color is now consistent with other awaiting states.
• Project – Add integration test suite from the dev branch to test batches.
• Project – Migrate solution to the slnx format and modernize build infrastructure.
• Project – Replace netcoreapp3.1 with net8.0 target in tests.