Fix passkey autofocus issue in client helpers

[tsunoyu]

Description

This PR updates the Loading helper class in src/client/helpers/index.ts to correctly manage standard HTML input elements alongside mdui-text-field web components.

The "Passkey form autofill" flow (passkey-form-autofill.html) relies on the autofocus attribute to automatically trigger the browser's WebAuthn conditional UI (the passkey selection prompt) immediately upon page load.

Previously, the Loading helper used in the client logic only targeted mdui-text-field elements when toggling the disabled state. This resulted in incomplete state management for forms containing standard <input> tags (such as hidden password fields or fallback inputs). This state inconsistency prevented the autofocus behavior from correctly triggering the passkey prompt.

Changes

• src/client/helpers/index.ts
  • Updated the querySelectorAll selector in both start() and stop() methods to target mdui-text-field, input instead of just mdui-text-field.
  • Added type casting to ensure the disabled property is correctly applied to both element types.

Testing

1. Navigate to the "Passkey form autofill" page (/passkey-form-autofill).
2. Ensure you have a passkey saved for this domain.
3. Refresh the page.
4. Observe: The browser's passkey autofill prompt should appear automatically over the username field without requiring a user click.

[agektmr]

Did you confirm that this code is excuted when you load /passkey-form-autofill? I can't confirm.