feat(text-input)!: port to <pf-v6-text-input>

[zeroedin]

What I did

• Removes <pf-v5-text-input>
• Ports <pf-v5-text-input> to <pf-v6-text-input> web component for PatternFly v6
• Single-line text input with type variants, validation states, and custom icon support
• Form-associated custom element (FACE): submits value via ElementInternals, supports form reset, constraint validation (checkValidity(), reportValidity(), setCustomValidity())
• Progressive enhancement for referenceTarget: when available, external <label for> and aria-describedby resolve natively through the shadow boundary
• Fallback label association via delegatesFocus + computedLabelText string copy (same mechanism as v5)
• Error state announced to screen readers via visually-hidden role="alert" + aria-describedby on the internal input
• CSS uses v6 design tokens (--pf-v6-c-form-control--*, --pf-t--global--*) with light-dark() fallbacks
• Grid layout with ::before/::after pseudo-elements for border styling (matching v6 SCSS structure)
• Internal class-based state styling via classMap instead of :host([attr]) selectors
• Cancelable change event: call preventDefault() to reject a value change
• Labels via external <label for="id"> or accessible-label attribute
• Keyboard: Enter submits the parent form (when valid)
• Demos: basic, disabled, start-truncated, read-only, invalid, custom-icon, custom-icon-and-invalid, select-text, form-submission, validation

InternalsController fix (pfe-core)

• Exposes form, validationMessage, and willValidate getters on InternalsController
• These were declare-only (TypeScript type annotations with no runtime implementation) since the dynamic proxy was removed in feat: listbox elements #2570
• Required by pf-v6-text-input for Enter-to-submit (form?.requestSubmit()) and error message rendering (validationMessage)
• No impact on existing elements — none access these properties on the controller today

Closes #3043

Intentional divergences from React

• customIcon prop replaced by icon slot (slotted content for composability)
• isDisabled/isRequired renamed to disabled/required (no is- prefix per web component convention)
• isStartTruncated replaced by truncated="start" enum attribute for future extensibility
• readOnlyVariant split into readonly + plain attributes (native HTML readonly + visual modifier)
• isExpanded/expandedProps not implemented (combobox patterns will be handled by a dedicated composite element)
• onChange callback replaced by cancelable change DOM event
• validated="default" state represented by attribute absence
• innerRef + .select() replaced by select() method directly on the element
• Form association added (not in React): native form participation, submission, reset, and constraint validation

Testing Instructions

Notes to Reviewers

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🦋 Changeset detected

Latest commit: af1aabd

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 2 packages

Name	Type
@patternfly/pfe-core	Patch
@patternfly/elements	Major

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More Info

{
  "valid": true,
  "errors": [],
  "warnings": [],
  "input": "feat(text-input)!: port  to `<pf-v6-text-input>`"
}

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