Fix build configuration and parallax PHP rendering

[Copilot]

Code review identified two critical issues: the main extension code wasn't being built, and parallax effects don't work on dynamic blocks.

Build Configuration

Added webpack.config.js to explicitly configure entry points. Without it, wp-scripts auto-discovery only finds src/progress-block/index.js via its block.json, ignoring src/index.js:

const defaultConfig = require('@wordpress/scripts/config/webpack.config');

module.exports = [
  {
    ...defaultConfig[0],
    entry: {
      index: './src/index.js',
      'progress-block/index': './src/progress-block/index.js',
    },
  },
  ...defaultConfig.slice(1),
];

Parallax PHP Support

Extended render_block filter to handle parallaxEnabled and parallaxStrength attributes. Previously only processed animationType, causing parallax to fail on server-rendered blocks:

$has_animation = isset( $attrs['animationType'] ) && 'none' !== $attrs['animationType'];
$has_parallax = isset( $attrs['parallaxEnabled'] ) && true === $attrs['parallaxEnabled'];

if ( $has_animation || $has_parallax ) {
    // Enqueue styles and inject data attributes + CSS variables
    if ( $has_parallax ) {
        $parallax_strength = isset( $attrs['parallaxStrength'] ) ? absint( $attrs['parallaxStrength'] ) : 50;
        $data_attrs .= ' data-parallax="1" data-parallax-strength="' . esc_attr( $parallax_strength ) . '"';
        $inline_styles = '--parallax-strength: ' . esc_attr( $parallax_strength ) . 'px;';
    }
}

Code Formatting

Applied Prettier to align with project standards.

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