Fix PHPCS: add @file docblocks, return types, declare(strict_types=1),
use str_starts_with(), fix line lengths, expand field arrays in .install
Fix PHPCS: replace \Drupal:: static calls with injected services across
Controller, Forms, and CssAnalyzerService
Fix ESLint: remove 'use strict' from IIFEs, convert for...of to forEach,
fix no-new/no-undef for Chart.js, prefer-template, prefer-destructuring,
no-use-before-define, no-empty catch blocks, class-methods-use-this
Fix Stylelint: property order, single-line expansion, CSS formatting
