fix(addon-search): normalize invalid highlightLimit values

Clamp highlightLimit to a positive finite integer, falling back to the
default when the option is missing or invalid.

Co-authored-by: Cursor <cursoragent@cursor.com>

addons/addon-search/src/SearchAddon.ts

@@ -54,7 +54,8 @@ export class SearchAddon extends Disposable implements ITerminalAddon, ISearchAp
   constructor(options?: Partial<ISearchAddonOptions>) {
     super();
 
-    this._highlightLimit = options?.highlightLimit ?? Constants.DEFAULT_HIGHLIGHT_LIMIT;
+    const limit = options?.highlightLimit ?? Constants.DEFAULT_HIGHLIGHT_LIMIT;
+    this._highlightLimit = Number.isFinite(limit) && limit > 0 ? Math.floor(limit) : Constants.DEFAULT_HIGHLIGHT_LIMIT;
   }
 
   public activate(terminal: Terminal): void {