Extract Grid Style 9 featured image hover transform effects

- Add cross-browser scale(1.1) transform on hover with webkit/moz/o/ms prefixes
- Include legacy IE filter support for Matrix transformation
- Apply .pp-content-post-grid parent scoping to prevent global conflicts

Author: pftg

themes/beaver/assets/css/utilities/components/powerpack/content-grid.css

@@ -243,4 +243,15 @@
   -ms-transition: all 0.5s ease;
   -o-transition: all 0.5s ease;
   transition: all 0.5s ease;
+}
+
+/* Grid Style 9 Featured Image Hover Transform */
+.pp-content-post-grid .pp-content-post.pp-grid-style-9:hover .pp-post-featured-img {
+  -webkit-transform: scale(1.1);
+  -moz-transform: scale(1.1);
+  -o-transform: scale(1.1);
+  -ms-transform: scale(1.1);
+  -ms-filter: "progid:DXImageTransform.Microsoft.Matrix(M11=1.1, M12=0, M21=0, M22=1.1, SizingMethod='auto expand')";
+  filter: progid:DXImageTransform.Microsoft.Matrix(M11=1.1, M12=0, M21=0, M22=1.1, SizingMethod='auto expand');
+  transform: scale(1.1);
 }