feat(material/radio): Hovering over label of a radio will show the pointer cursor

This is consistent with checkbox behavior.

Radio used to work that way too until Angular Material v14. v15
broke it, and it remained broken until now.

Fixes #26067, at least partially

Author: PowerKiKi

src/material/radio/radio.scss

@@ -11,6 +11,12 @@ $fallbacks: m3-radio.get-tokens();
   @include radio-common.radio-structure(true);
   @include radio-common.radio-noop-animations();
 
+  // Clicking the label toggles the radio, but MDC does not include any styles that inform the
+  // user of this. Therefore we add the pointer cursor on top of MDC's styles.
+  label {
+    cursor: pointer;
+  }
+
   .mdc-radio__background::before {
     background-color: token-utils.slot(radio-ripple-color, $fallbacks);
   }