refactor: extract StreamNowButton component shared by hero and nav menu

DeepDrftPublic.Client/Layout/DeepDrftMenu.razor.css

@@ -90,7 +90,7 @@
 }
 
 /* Stream Now CTA — square pill, navy on warm white */
-.dd-nav-cta {
+::deep .dd-nav-cta {
     display: inline-block;
     font-family: var(--deepdrft-font-mono);
     font-size: 0.68rem;
@@ -106,18 +106,18 @@
     transition: background 0.25s ease;
 }
 
-.dd-nav-cta:hover,
-.dd-nav-cta:focus-visible {
+::deep .dd-nav-cta:hover,
+::deep .dd-nav-cta:focus-visible {
     background: var(--deepdrft-green);
 }
 
-.dd-nav-dark .dd-nav-cta {
+.dd-nav-dark ::deep .dd-nav-cta {
     color: var(--deepdrft-white);
     background: var(--deepdrft-primary);
 }
 
-.dd-nav-dark .dd-nav-cta:hover,
-.dd-nav-dark .dd-nav-cta:focus-visible {
+.dd-nav-dark ::deep .dd-nav-cta:hover,
+.dd-nav-dark ::deep .dd-nav-cta:focus-visible {
     background: var(--deepdrft-senary);
 }
 
@@ -207,7 +207,7 @@
     padding: 0.6rem 0;
 }
 
-.dd-nav-links-mobile .dd-nav-cta {
+.dd-nav-links-mobile ::deep .dd-nav-cta {
     margin-top: 0.5rem;
     text-align: center;
 }