fix: give the modal card and header icon buttons accessible names

[devtechedge]

Description

The modal card (wui-card, role="alertdialog") had no accessible name, and the header's icon-only buttons could not be given one because wui-icon-button never forwarded a label to its inner <button>. A screen reader announced the modal as an unnamed dialog and the close/help controls as a bare "button".

• wui-icon-button gains an optional label property, rendered as aria-label on the inner button and omitted when unset.
• w3m-header labels Close, Help, Back, and Smart Sessions — the four wui-icon-button call sites in scaffold-ui.
• w3m-modal sets aria-label on the card from the current view heading. aria-labelledby cannot cross the shadow boundary into w3m-header, so the heading map is exported and the modal computes the same string on view change. Views with no heading (Account, Account Settings) fall back to a spaced view name.
• The Connect heading no longer carries a double space when email is not the only connector (Connect Wallet). HTML collapsed it visually; it would have become the card's literal name.

Type of change

• Chore (non-breaking change that addresses non-functional tasks, maintenance, or code quality improvements)
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Associated Issues

closes #5761

Showcase (Optional)

No visual change.

button -> button "Help"
button -> button "Close"
alertdialog (no name) -> alertdialog "Connect Wallet"

Checklist

• Code in this PR is covered by automated tests (Unit tests, E2E tests)
• My changes generate no new warnings
• I have reviewed my own code
• I have filled out all required sections
• I have tested my changes on the preview link
• Approver of this PR confirms that the changes are tested on the preview link

[changeset-bot]

🦋 Changeset detected

Latest commit: 0ef28f7

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

This PR includes changesets to release 27 packages

Name	Type
@reown/appkit-ui	Patch
@reown/appkit-scaffold-ui	Patch
@reown/appkit	Patch
@reown/appkit-siwe	Patch
@reown/appkit-wallet-button	Patch
@reown/appkit-experimental	Patch
@reown/appkit-pay	Patch
@reown/appkit-adapter-ethers	Patch
@reown/appkit-adapter-ethers5	Patch
@reown/appkit-adapter-wagmi	Patch
@reown/appkit-adapter-bitcoin	Patch
@reown/appkit-adapter-solana	Patch
@reown/appkit-adapter-stellar	Patch
@reown/appkit-adapter-ton	Patch
@reown/appkit-adapter-tron	Patch
@reown/appkit-universal-connector	Patch
@reown/appkit-cdn	Patch
@reown/appkit-testing	Patch
@reown/appkit-common	Patch
@reown/appkit-controllers	Patch
@reown/appkit-core	Patch
@reown/appkit-utils	Patch
@reown/appkit-polyfills	Patch
@reown/appkit-wallet	Patch
@reown/appkit-siwx	Patch
@reown/appkit-cli	Patch
@reown/appkit-codemod	Patch

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