feat: extract CSS contain from browser in Playwright adapter

- Add contain: cs.contain to browser-side style extraction
- Parse contain string into bitfield matching CDP extractor schema
- Add inline-size to CDP styles.ts contain parser for consistency

packages/imhotep-cdp/src/styles.ts

@@ -221,6 +221,7 @@ export async function extractStyles(
         if (part === 'style') containFlags |= 8
         if (part === 'strict') containFlags |= 15
         if (part === 'content') containFlags |= 7
+        if (part === 'inline-size') containFlags |= 16
       }
     }