Release 1.2.0

[firestar300]

• Clarify block inserter descriptions and refresh French translations
• Add WordPress Playground blueprint and README badge for wordpress.org
• Update block icons (@beapi/icons, @wordpress/icons) and related scripts
• Developer: Volta Node pin, TypeScript ESLint packages for ESLint, JS workflow triggers on package.json changes

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Note

Low Risk
Low risk release/metadata update: primarily version bumps and documentation/blueprint updates, with no functional PHP/JS logic changes in the diff.

Overview
Bumps the plugin release to 1.2.0 across plugin metadata (blockparty-accordion.php, .plugin-data), npm package files, and all block block.json manifests.

Adds a 1.2.0 entry to CHANGELOG.md/readme.txt, updates the WordPress.org blueprint.json to install the 1.2.0 tag, and applies minor JSON formatting/normalization in the block manifests.

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