feat(reader-registration-block): password and OTP authentication flows

[miguelpeixe]

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Changes proposed in this Pull Request:

NPPD-1142

Repurposes the Reader Registration block to support a complete authentication flow.

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[Copilot]

Pull request overview

This PR refactors the Reader Registration block to support a complete authentication flow, including password and OTP authentication for existing users. The changes extract reusable authentication utilities, add new UI states for OTP and password entry, and modify the block to handle returning users differently from new registrations.

Changes:

• Refactored OTP input handling into reusable, exportable functions in otp-input.js
• Created shared authentication utilities in auth-utils.js for OTP, password, and magic link handling
• Added OTP and password authentication UI states to the Reader Registration block
• Updated backend to detect whether existing users need password or OTP authentication

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
src/reader-activation-auth/otp-input.js	Refactored OTP input initialization into exportable functions for reusability
src/reader-activation-auth/auth-utils.js	New file containing shared authentication utilities (OTP, password, magic link handlers)
src/reader-activation-auth/auth-form.js	Updated to use shared authentication utilities from auth-utils.js
src/blocks/reader-registration/view.js	Implemented authentication flows with OTP and password states; fixed spelling errors
src/blocks/reader-registration/index.php	Added logic to determine authentication method for existing users; removed sign-in link
src/blocks/reader-registration/style.scss	Added styles for OTP and password authentication UI states
src/blocks/reader-registration/edit.js	Removed sign-in link UI from block editor
src/blocks/reader-registration/block.json	Removed signInLabel attribute; updated signedInLabel default

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