fix(vscode): use models sparkle icon for auto model instead of branch

The branch icon read as a git merge glyph for the auto model entry.
Swap to the models sparkle icon, which conveys automatic/AI selection.

Author: johnnyeric

packages/kilo-vscode/webview-ui/src/components/shared/ModelPreview.tsx

@@ -108,7 +108,7 @@ export const ModelPreview: Component<Props> = (props) => {
                       <Show when={isAuto(model())}>
                         <Tooltip value={autoLabel()} placement="top">
                           <span class="model-preview-auto-icon" aria-label={autoLabel()}>
-                            <Icon name="branch" size="small" />
+                            <Icon name="models" size="small" />
                           </span>
                         </Tooltip>
                       </Show>

packages/kilo-vscode/webview-ui/src/components/shared/ModelSelector.tsx

@@ -965,7 +965,7 @@ export const ModelSelectorBase: Component<ModelSelectorBaseProps> = (props) => {
                                 <Show when={isAuto(model)}>
                                   <Tooltip value={autoLabel(model)} placement="top">
                                     <span class="model-selector-auto-icon" aria-label={autoLabel(model)}>
-                                      <Icon name="branch" size="small" />
+                                      <Icon name="models" size="small" />
                                     </span>
                                   </Tooltip>
                                 </Show>