fix(VTextField): remove redundant aria-labelledby from input

[waterWang]

Description

Fixes #21914

The input element had an aria-labelledby attribute referencing the main label by id. When the field is active, the main label has aria-hidden="true" while the floating label already provides the accessible name via the native <label for> association.

This dual association caused screen readers, especially Safari VoiceOver, to read the label text multiple times — up to 5× for a single text field.

Root Cause

In VField.tsx, two label elements are rendered:

1. Floating label (visible when active) — has for={id}
2. Main label (visible when inactive) — has id={id}-label

The aria-labelledby=\{id}-label\ on the input always references the main label. When the field is active, the main label is aria-hidden="true", making the aria-labelledby reference redundant — the native <label for> association already provides the correct accessible name.

Fix

Removed the aria-labelledby attribute from the <input> element in VTextField.tsx. The native <label for> association on the label that is currently visible (floating when active, main when inactive) handles the accessible name correctly.

Testing

• ✅ Vuetify build passes
• ✅ All 9 VTextField unit tests pass
• ✅ No visual changes