fix(examples/lit/basic): show the error message instead of the stringified error

examples/lit/basic/src/basic-query.ts

@@ -61,7 +61,7 @@ class BasicQueryExample extends LitElement {
         ${
           query.isError
             ? html`<p data-testid="basic-error">
-                Error: ${String(query.error)}
+                Error: ${query.error.message}
               </p>`
             : null
         }

examples/lit/basic/src/lifecycle-contract.ts

@@ -103,7 +103,7 @@ class LifecycleContractConsumer extends LitElement {
           payload: ${query.data?.payload ?? 'none'}
         </div>
         <div data-testid="contract-error">
-          error: ${query.error ? String(query.error) : 'none'}
+          error: ${query.error ? query.error.message : 'none'}
         </div>
       `
     } catch (error) {

examples/lit/basic/src/main.ts

@@ -237,13 +237,13 @@ class TanstackLitQueryDemo extends LitElement {
 
         ${
           query.isError
-            ? html`<div data-testid="query-error">${String(query.error)}</div>`
+            ? html`<div data-testid="query-error">${query.error.message}</div>`
             : null
         }
         ${
           mutation.isError
             ? html`<div data-testid="mutation-error">
-                ${String(mutation.error)}
+                ${mutation.error.message}
               </div>`
             : null
         }