refactor(core): suppress mask/highlight errors instead of failing the run

Visual feedback failures (showMask, hideMask, cleanUpHighlights) are
non-critical; log them instead of aborting the task or masking the
original error during teardown.

packages/core/src/utils/index.ts

@@ -129,3 +129,15 @@ export function assert(condition: unknown, message?: string, silent?: boolean):
 		throw new Error(errorMessage)
 	}
 }
+
+/**
+ * Suppress errors from a function.
+ */
+export function suppress<T>(fn: () => T): T | undefined {
+	try {
+		return fn()
+	} catch (error) {
+		console.error(error)
+		return undefined
+	}
+}