Refactor: Move NVIDIA driver warning to frontend install flow

## Summary
The NVIDIA driver (R580) warning currently lives in the main process (`InstallationManager`) and runs during `freshInstall()`. We want to move this warning into the frontend install flow so the UI controls when and how it appears.

## Motivation
- Make the warning placement and UX explicit in the frontend
- Avoid backend modal timing confusion
- Easier to adjust messaging and trigger conditions

## Notes
- Current check uses `nvidia-smi` and minimum version `580`
- Warning should appear during install flow for NVIDIA-selected device

## Acceptance Criteria
- Driver warning logic owned by frontend
- Backend exposes a simple capability/driver query (or uses existing IPC) as needed
- Warning placement clearly in UI flow (e.g., after device selection)

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*This issue is transferred from: https://github.com/Comfy-Org/desktop/issues/1579*

Original issue was created by @benceruleanlu at 2026-02-03T20:38:04.000Z

┆Issue is synchronized with this [Notion page](https://www.notion.so/Issue-8586-Refactor-Move-NVIDIA-driver-warning-to-frontend-install-flow-2fc6d73d365081dc8417cfbb0646096a) by [Unito](https://www.unito.io)