fix(tokens): input border color and radius tokens

Port of #31468 from next. Uses the input border token for the outline
variant and the lg soft shape radius for the soft variant.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

Author: BenOsodrac

core/src/components/input/input.ionic.outline.scss

@@ -2,5 +2,5 @@
 
 :host(.input-fill-outline) {
   --background: #{globals.$ion-bg-surface-default};
-  --border-color: #{globals.$ion-primitives-neutral-500};
+  --border-color: #{globals.$ion-border-input-default};
 }

core/src/components/input/input.ionic.scss

@@ -139,7 +139,7 @@
 // --------------------------------------------------
 
 :host(.input-shape-soft) {
-  --border-radius: #{globals.$ion-shape-soft-xl};
+  --border-radius: #{globals.$ion-shape-soft-lg};
 }
 
 :host(.input-shape-round) {