Summary

• inputMode reset fix: When cloud connects, refreshPipelineSchemas() creates a new pipelineSchemas object reference. An effect in useStreamState.ts watched this dependency and unconditionally reset inputMode to the pipeline's default, overwriting the user's selection (e.g. "video" snapped back to "text"). Added a useRef to track the previous pipelineId so the effect only resets inputMode when the pipeline actually changes.
• Drop async from input source routes: The NDI input source API routes (list_input_sources, get_input_source_resolution, get_input_source_preview) were declared async but perform blocking I/O. Removing async lets FastAPI run them in a threadpool, preventing them from blocking the event loop.

Test plan

• Enable remote inference (pending state), switch to Video mode, wait for cloud connection to establish — mode should remain "video"
• Switch pipelines — inputMode should still reset to the new pipeline's default
• Fresh page load — inputMode should initialize to the pipeline's default
• NDI input source discovery, resolution probe, and preview all work correctly

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