Refine hero: gradient backdrop, intro inside hero, image on right, vector visible

- styles/blocks/page-hero.css: add blue-to-teal gradient to .page-hero (matches
  homepage-hero). Fix image mask direction (right-to-left fade) so the image
  is visible on the right and fades to transparent on the left. Reposition
  the vector to span the full bottom of the hero at z-index 2 (above the
  media layer, below content). Add .page-hero__intro and .page-hero__intro-inner
  grid rules for the new two-column heading + body block.
- views/partials/page-hero.php: drop bg-dark / bg-cover / bg-no-repeat
  utilities (the gradient comes from CSS now). Simplify the heading render.
  Load the page-intro partial inside .page-hero__content, below the heading.
- views/partials/page-intro.php: rewrite as a fragment for embedding inside
  the hero - a two-column heading (hard-coded 'Our Work') + body grid.
  Returns early when the intro field is empty.
- page.php: remove the page-intro partial call (it's now loaded from
  page-hero.php).
- tests/inner-page.spec.js: switch the selector from .page-intro to
  .page-hero__intro. Update the order assertions to verify the intro is
  a descendant of the hero (not a sibling below it).

Co-Authored-By: Claude <noreply@anthropic.com>

styles/blocks/page-hero.css

@@ -2,33 +2,37 @@
  * Scoped to .page-hero to avoid affecting the homepage-hero block. */
 
 .page-hero {
+    background:
+        linear-gradient(83.68deg, #032F46 3.13%, #006196 45.91%, #8FC9E6 96.27%);
     isolation: isolate;
+    overflow: hidden;
     position: relative;
 }
 
 .page-hero__media {
     inset: 0;
-    -webkit-mask-image: linear-gradient(to right, transparent 0%, black 30%);
-    mask-image: linear-gradient(to right, transparent 0%, black 30%);
+    -webkit-mask-image: linear-gradient(to left, transparent 0%, black 50%);
+    mask-image: linear-gradient(to left, transparent 0%, black 50%);
     position: absolute;
-    z-index: 0;
+    z-index: 1;
 }
 
 .page-hero__media img {
     display: block;
     height: 100%;
     object-fit: cover;
+    object-position: right center;
     width: 100%;
 }
 
 .page-hero__vector {
     bottom: 0;
     height: auto;
+    left: 0;
     pointer-events: none;
     position: absolute;
-    right: 0;
-    width: clamp(18rem, 38vw, 32rem);
-    z-index: 1;
+    width: 100%;
+    z-index: 2;
 }
 
 .page-hero__content {
@@ -36,6 +40,22 @@
     z-index: 10;
 }
 
+.page-hero__intro {
+    margin-top: clamp(2rem, 6vw, 4rem);
+}
+
+.page-hero__intro-inner {
+    display: grid;
+    gap: clamp(1.5rem, 4vw, 3rem);
+    grid-template-columns: 1fr;
+}
+
+@media (min-width: 768px) {
+    .page-hero__intro-inner {
+        grid-template-columns: 1fr 2fr;
+    }
+}
+
 @media (max-width: 767px) {
     .page-hero__media {
         -webkit-mask-image: linear-gradient(