UI improvment

[firestar300]

UI improvment

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Note

Low Risk
Changes are packaging, naming, demo blueprint, and dev dependencies; plugin runtime PHP in the diff is limited to the header string.

Overview
Prepares the plugin for WordPress.org / Playground and trims local PHP tooling, with no runtime block behavior changes in this diff.

The plugin header display name is updated to Blockparty Table of content. A new .wordpress.org/blueprints/blueprint.json installs the plugin from the 1.0.4 tag, logs in, and seeds a demo page at /blockparty-table-of-content-demo/ with sample headings and a table-of-content block.

Composer dev dependencies drop Psalm, PHPLint, and phpcompatibility/phpcompatibility-wp in favor of phpcompatibility/php-compatibility, explicit squizlabs/php_codesniffer, and wp-cli/wp-cli; the psalm composer script is removed. composer.lock is deleted and added to .gitignore, so installs are no longer pinned in the repo. GrumPHP no longer runs Psalm.

The JS lint workflow only fixes YAML indentation for node-version-file. CI/local quality gates are lighter (no Psalm in GrumPHP), which may reduce static analysis coverage until something replaces it.

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