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
       }
     }
 

packages/imhotep-playwright/src/extraction.ts

@@ -465,6 +465,7 @@ export async function extractWorldFastGeometry(
                         overflowY: cs.overflowY,
                         visibility: cs.visibility,
                         pointerEvents: cs.pointerEvents,
+                        contain: cs.contain,
                         opacity: Number.parseFloat(cs.opacity) || 1,
                         zIndex: cs.zIndex,
                         lineHeight: Number.parseFloat(cs.lineHeight) || 0,
@@ -626,7 +627,22 @@ export async function extractWorldFastGeometry(
         zIndexKind.push(s.zIndex === 'auto' ? 0 : 1)
         zIndexValue.push(s.zIndex === 'auto' ? 0 : Number.parseInt(s.zIndex, 10) || 0)
         opacity.push(s.opacity)
-        containFlags.push(0)
+        const csContain = (s as any).contain
+        let flags = 0
+        if (typeof csContain === 'string') {
+          for (const part of csContain.split(/\s+/)) {
+            switch (part) {
+              case 'layout': flags |= 1; break
+              case 'paint': flags |= 2; break
+              case 'size': flags |= 4; break
+              case 'style': flags |= 8; break
+              case 'strict': flags |= 15; break
+              case 'content': flags |= 7; break
+              case 'inline-size': flags |= 16; break
+            }
+          }
+        }
+        containFlags.push(flags)
         lineHeight.push(s.lineHeight)
         fontFamilyStringId.push(intern(s.fontFamily))
         fontSize.push(s.fontSize)