fix(docsite): give Timestamp playground a valid default value

[cixzhang]

Problem

Opening the Timestamp component page on the docsite renders Render error: Invalid time value in the interactive properties-tab preview on load.

Timestamp's required prop value: string | number has no semantic default. The docsite's preview state builder (getRequiredFallbackValue in apps/docsite/src/components/component-detail/interactiveState.ts) falls back to the prop's own name for required string props — so value becomes the literal string "value". Timestamp then calls new Date("value").toISOString(), which throws Invalid time value, surfaced by the preview error boundary.

Root cause

Timestamp.doc.mjs had no playground.defaults block, so the preview used the generic required-string fallback ("value") — not a real date.

Fix

Add a playground.defaults.value to Timestamp.doc.mjs with a valid ISO 8601 date (2026-02-19T17:00:00Z), matching the existing pattern used by Icon and Skeleton docs to seed required, non-generatable props. This flows through the generated component registry into buildInitialState, so the preview now renders a real formatted timestamp instead of crashing.

Reproduction (red → green)

Added a unit test in apps/docsite/src/__tests__/component-preview-state.test.ts (alongside the existing Icon/Skeleton cases):

• Asserts the un-defaulted required value falls back to the string "value", and that new Date("value").toISOString() throws Invalid time value — demonstrating the crash.
• Asserts the playground default seeds a valid date the component can render, with no missing required props.

Verified the test fails when the default is the buggy "value" and passes with the valid ISO date:

× gives Timestamp a valid date value via playground defaults
  → expected 'value' to be '2026-02-19T17:00:00Z'   (before fix)
✓ gives Timestamp a valid date value via playground defaults   (after fix)

Confirmed the generated componentRegistry now carries Timestamp.playground.defaults.value = "2026-02-19T17:00:00Z".

Refs #2877 (BB-002)

[vercel]

The latest updates on your projects. Learn more about Vercel for GitHub.

Project	Deployment	Actions	Updated (UTC)
astryx	Ready	Preview, Comment	Jun 28, 2026 3:21pm

[github-actions]

PR Analysis Report

📚 Storybook Preview

View Storybook for this PR
GitHub Pages may take up to a minute to hydrate after deploy.

🧪 Sandbox Preview

View Sandbox for this PR
GitHub Pages may take up to a minute to hydrate after deploy.

No new or modified components detected.

Bundle Size Summary

Package	Size (ESM)	Size (CJS)	Gzipped
@astryxdesign/core	N/A	4.6KB	0B

Accessibility Audit

Status: No accessibility violations detected.

---

_{Generated by PR Enrichment workflow | Storybook | Sandbox | View full report}