Document CSP Sandbox Stack "View origin" chip

[mintlify]

Added documentation for the new View origin chip in the CSP Workbench's Sandbox Stack tab, which shows developers the iframe origin to allowlist for referrer-restricted API keys, OAuth redirect URIs, or frame-ancestors policies.

Files changed:

• docs/inspector/playground.mdx — Added a new #### Sandbox Stack tab subsection under ### CSP in the Per-Widget Debugging section, explaining the copyable origin chip, the about:srcdoc · no origin fallback state, and the pre-mount hidden behavior.

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Summary by cubic

Documents the View origin chip in the CSP Workbench's Sandbox Stack tab, which exposes the iframe origin developers need to allowlist for referrer-restricted API keys, OAuth redirect URIs, and frame-ancestors policies.

• Covers the copyable origin chip and the about:srcdoc · no origin fallback when the view mounts via srcdoc.
• Notes the chip stays hidden until the sandbox proxy reports a mount, so no stale values appear.

^{Written for commit 4ed9803. Summary will update on new commits.}

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