Synchronous container detection — fast heuristic check without product-sdk.
Checks for iframe, webview marker, and host message port signals.
Use this when you need a quick sync check (e.g., in hot code paths).
For full detection including product-sdk, use isInsideContainer (async).
Synchronous container detection — fast heuristic check without product-sdk.
Checks for iframe, webview marker, and host message port signals. Use this when you need a quick sync check (e.g., in hot code paths). For full detection including product-sdk, use isInsideContainer (async).