Enable autoValidate on state card

src/panels/lovelace/entity-rows/hui-number-entity-row.ts

@@ -177,7 +177,7 @@ class HuiNumberEntityRow extends LitElement implements LovelaceRow {
     }
   }
 
-  private _selectedValueChanged(ev): void {
+  private _selectedValueChanged(ev: Event): void {
     const stateObj = this.hass!.states[this._config!.entity];
     const target = ev.target as HTMLInputElement;
 

src/state-summary/state-card-number.ts

@@ -75,6 +75,7 @@ class StateCardNumber extends LitElement {
           `
         : html` <div class="flex state">
             <ha-textfield
+              autoValidate
               .disabled=${isUnavailableState(this.stateObj.state)}
               pattern="[0-9]+([\\.][0-9]+)?"
               .step=${Number(this.stateObj.attributes.step)}