Add sysinfo preview with mock WaveEnv and frontend-only WPS updates

[Copilot]

This adds a preview-server setup for sysinfo using the new mock WaveEnv pattern already used by other live component previews. The preview provides the SysinfoEnv surface directly, seeds initial history, and drives ongoing updates entirely in the frontend via handleWaveEvent().

• New sysinfo preview

  • Adds frontend/preview/previews/sysinfo.preview.tsx
  • Renders multiple sysinfo scenarios:
    • CPU
    • CPU + Mem
    • All CPU
  • Instantiates SysinfoViewModel directly against a preview-scoped mock env

• Mock SysinfoEnv wiring

  • Provides the env contract sysinfo.tsx expects:
    • EventReadHistoryCommand
    • SetMetaCommand
    • fullConfigAtom
    • getConnStatusAtom / getBlockMetaKeyAtom via the shared mock env
  • Seeds a mock block object with the required meta:
    • view: "sysinfo"
    • connection
    • sysinfo:type
    • graph:numpoints

• Frontend-only live data path

  • Seeds preview history for EventReadHistoryCommand
  • Publishes incremental sysinfo updates on an interval with handleWaveEvent()
  • Installs a preview-only noop WPS RPC client so WPS subscriptions register cleanly without backend traffic

• Preview state behavior

  • Keeps block meta updates local in preview mode by updating the mocked block atom in SetMetaCommand
  • Maintains rolling history so the preview behaves like the live component instead of a static snapshot

const nextEvent = makeSysinfoEvent(connection, Date.now(), state.tick);
state.history.push(nextEvent);
handleWaveEvent(nextEvent);

• Screenshot
  • https://github.com/user-attachments/assets/9693bb02-9923-4aa7-83c7-57aedca78280

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