fix: centralize toSnakeCase into web_core to eliminate renderer duplication

renderers/angular/src/lib/catalog/icon.ts

@@ -17,6 +17,7 @@
 import { ChangeDetectionStrategy, Component, computed, input } from '@angular/core';
 import { DynamicComponent } from '../rendering/dynamic-component';
 import * as Primitives from '@a2ui/web_core/types/primitives';
+import { toSnakeCase } from '@a2ui/web_core/styles/icons';
 
 @Component({
   selector: 'a2ui-icon',
@@ -45,5 +46,8 @@ import * as Primitives from '@a2ui/web_core/types/primitives';
 })
 export class Icon extends DynamicComponent {
   readonly name = input.required<Primitives.StringValue | null>();
-  protected readonly resolvedName = computed(() => this.resolvePrimitive(this.name()));
+  protected readonly resolvedName = computed(() => {
+    const name = this.resolvePrimitive(this.name());
+    return name ? toSnakeCase(name) : name;
+  });
 }

renderers/lit/src/0.8/ui/icon.ts

@@ -22,6 +22,7 @@ import * as Primitives from "@a2ui/web_core/types/primitives";
 import { classMap } from "lit/directives/class-map.js";
 import { styleMap } from "lit/directives/style-map.js";
 import { structuralStyles } from "./styles.js";
+import { toSnakeCase } from "@a2ui/web_core/styles/icons";
 
 @customElement("a2ui-icon")
 export class Icon extends Root {
@@ -68,8 +69,7 @@ export class Icon extends Root {
     }
 
     const render = (url: string) => {
-      url = url.replace(/([A-Z])/gm, "_$1").toLocaleLowerCase();
-      return html`<span class="g-icon">${url}</span>`;
+      return html`<span class="g-icon">${toSnakeCase(url)}</span>`;
     };
 
     if (this.name && typeof this.name === "object") {

renderers/react/src/components/content/Icon.tsx

@@ -19,15 +19,7 @@ import type * as Types from '@a2ui/web_core/types/types';
 import type {A2UIComponentProps} from '../../types';
 import {useA2UIComponent} from '../../hooks/useA2UIComponent';
 import {classMapToString, stylesToObject} from '../../lib/utils';
-
-/**
- * Convert camelCase to snake_case for Material Symbols font.
- * e.g., "shoppingCart" -> "shopping_cart"
- * This matches the Lit renderer's approach.
- */
-function toSnakeCase(str: string): string {
-  return str.replace(/([A-Z])/g, '_$1').toLowerCase();
-}
+import {toSnakeCase} from '@a2ui/web_core/styles/icons';
 
 /**
  * Icon component - renders an icon using Material Symbols Outlined font.

renderers/web_core/src/v0_8/styles/icons.ts

@@ -14,6 +14,21 @@
  * limitations under the License.
  */
 
+/**
+ * Converts a camelCase icon name to snake_case for use with Material Symbols.
+ *
+ * The Material Symbols font uses snake_case names (e.g., "shopping_cart"),
+ * but A2UI icon names may be provided in camelCase (e.g., "shoppingCart").
+ * This utility normalizes them so all renderers behave consistently.
+ *
+ * @example
+ * toSnakeCase('shoppingCart') // -> 'shopping_cart'
+ * toSnakeCase('home')         // -> 'home'
+ */
+export function toSnakeCase(str: string): string {
+  return str.replace(/([A-Z])/g, '_$1').toLowerCase().replace(/^_/, '');
+}
+
 /**
  * CSS classes for Google Symbols.
  *