feat: add Honcho Cloud connection preset + sidebar health indicator

[offendingcommit]

Summary

• Adds a choose-type step to the settings flow so users can pick Honcho Cloud (https://api.honcho.dev, API key required) or Self-Hosted (URL + optional token) when creating a connection. Multi-instance support is already in the data layer, so cloud and self-hosted instances coexist freely.
• Adds a sidebar health dot that polls the active instance every 30s via TanStack Query and shows a colored status badge (green = ok, amber = auth-required, red = unreachable, pulsing = checking).
• Adds a one-shot localhost auto-detect probe on the first-run choose-type screen; if http://localhost:8000 responds, a "Detected Honcho at localhost:8000" banner appears that opens the Self-Hosted form pre-filled.

Why

api.honcho.dev was already advertised in openapi.json as the production SaaS server, but the UI only spoke to it via the manual URL form. New users on Cloud now get a one-tap path; users running Honcho locally get the same. Health visibility was previously absent — you had to navigate to Settings and click "Test" to know if the active instance was alive.

Implementation notes

• HONCHO_CLOUD_URL constant + isCloudInstance(...) helper in packages/web/src/lib/config.ts.
• SettingsForm accepts a preset prop; cloud variant locks the endpoint and enforces an API key. Edit mode auto-detects the preset from the saved baseUrl.
• InstancesManager gains a choose-type mode and a ConnectionTypeChooser subcomponent.
• useHealthStatus() hook (refetchInterval: 30_000, refetchOnWindowFocus: true) and HealthDot component for status visualization.
• The instance list renders a Cloud icon for cloud instances; URL is hidden in favor of "Honcho Cloud" label.

Out of scope (filed as separate issue)

Cross-instance dashboard aggregation — surfaced as a real refactor (parameterize ~20 query hooks, scope query keys by instanceId, add per-instance client factory, sidebar fan-out UI). Tracked separately so it can be reviewed on its own.

Test plan

• pnpm --filter @openconcho/web lint — clean
• pnpm --filter @openconcho/web typecheck — clean
• pnpm --filter @openconcho/web test — 11/11 pass (3 new unit-test files)
• Manual: first-run with localStorage cleared → choose-type screen renders → "Honcho Cloud" path blocks save without API key, saves with key
• Manual: Self-Hosted path renders editable URL, token optional, can save without token
• Manual: edit a cloud instance → URL is locked, API key required
• Manual: with a Honcho dev server on localhost:8000, first-run banner appears
• Manual: sidebar dot polls and reflects status changes (kill the server, expect red within 30s)

https://claude.ai/code/session_016ASFQkNzX1hH1J3SNc5QAq

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