Add Material 3 radial urchin visualization to Visuals tab

[LennartvdM]

Summary

• replace the calendar tab with a Visuals experience that mounts the new radial urchin chart
• render interactive day/agent rings on canvas with Material 3 controls, legend, and replay tooling
• expose SVG/PNG export plus a legacy PNG fallback guarded by a persistent feature flag

Testing

• not run (UI-only change)

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Codex Task

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[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Escape event text before injecting tooltip HTML

The tooltip builder renders schedule data by assigning this.tooltipMeta.innerHTML = html where html is generated from arc.label, arc.event.activity, and arc.event.metadata.note without escaping. Because JSON payloads can be loaded from local storage or uploaded by the user, a crafted label like <img src=x onerror=alert(1)> will execute when the tooltip renders. Please treat these fields as untrusted and either use textContent or escape them before writing to innerHTML to avoid XSS.

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