Add full sysinfo block preview with frontend-only WaveEnv/WPS mocks

[Copilot]

The preview server had the new WaveEnv-based mocking path for widgets and block chrome, but sysinfo was still missing a corresponding setup. This wires sysinfo into the same model/block rendering flow and lets the preview drive updates entirely on the frontend via WPS.

• What changed

  • Added a dedicated sysinfo preview that renders the real block, not just the inner view.
  • Seeds preview WOS state with a mock tab + block (meta.view = "sysinfo") so the existing block registry, block chrome, and SysinfoViewModel run unchanged.
  • Streams mock sysinfo events through handleWaveEvent() to exercise the live subscription/update path without backend involvement.

• WaveEnv typing

  • Updated SysinfoEnv to use WaveEnvSubset<...> so its contract matches the newer typed env pattern already used by other encapsulated views/blocks.

• Preview WPS support

  • Wired the preview bootstrap to install a no-op WPS RPC client so frontend subscriptions can exist safely in preview mode.
  • This keeps waveEventSubscribeSingle() functional while still avoiding any backend interaction.

• Preview behavior

  • The new preview shows:
    • full block header/chrome
    • connection badge/header state
    • real sysinfo model behavior
    • continuously updating CPU + memory plots

const event = {
    event: "sysinfo",
    scopes: ["local"],
    data: makeSysinfoSample(pointNum, Date.now()),
};

handleWaveEvent(event);

• Files

  • frontend/preview/previews/sysinfo.preview.tsx
  • frontend/preview/preview.tsx
  • frontend/app/view/sysinfo/sysinfo.tsx

• Screenshot

  • https://github.com/user-attachments/assets/b9521201-95fa-46a7-baaf-61d8e2c73b6e

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