Make visuals init safe without data

[LennartvdM]

Summary

• guard the RadialUrchin visual against missing or invalid event data and return early when no payload is available
• defer visual creation until valid data exists while ensuring DOM hydration happens after the rest of the UI initializes
• wrap panel hydration in idempotent helpers so visuals failures do not block tabs or config setup

Testing

• No tests were run (not requested).

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Codex Task

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[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Allow RadialUrchin to initialize for empty schedules

The new guard in maybeCreateUrchinInstance (and the identical check inside createRadialUrchin) now refuses to construct the visual unless the payload contains at least one event. However, web_v1_calendar payloads are valid even when events is an empty array (e.g., freshly generated schedules or weeks that only carry metadata), and the RadialUrchin.update() implementation already handles that case by clearing its layout and rendering the "No activities available" legend. Because of this guard the component never hydrates for empty schedules, so the visuals panel stays blank forever and the user cannot interact with the controls or flip back from the legacy preview even though data was loaded. Please instantiate the urchin whenever a payload object exists and let RadialUrchin deal with empty event lists so that the empty‑state UI can render.

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