Clean markup and heading level attribute

[firestar300]

Clean markup and heading level attribute

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Note

Medium Risk
Front-end markup and accordion selectors change, which can break custom CSS or JS; mitigated by deprecated saves, dual accordion init, and legacy styles.

Overview
Refactors FAQ block saved HTML to rely on standard wp-block-blockparty-faq-* classes instead of custom faq__* wrappers, and wires the front-end accordion to the new trigger/panel selectors (with PHP-localized config updated to match).

Adds a headingLevel (h2–h6) setting on the parent FAQ block (inspector toggle group when accordion mode is on), propagated via block context and synced onto each question so accordion questions render as the chosen heading with a proper <button class="wp-block-blockparty-faq-trigger">.

Backward compatibility: deprecated save definitions preserve prior 2.0.x markup (faq__panel, faq__trigger, etc.), script.js initializes accordions for both new and legacy selectors, and styles include a legacy section so existing content keeps working.

Translations and POT are regenerated for per-block build entry points; package version bumps to 2.0.3.

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