PR-227028: update dependencies, migrate to TypeScript 6 and ESLint flat config

- Bump all dependencies to latest (React 19.2.7, Storybook 10.4.3, Webpack
  5.107.2 + webpack-cli 7, Jest 30.4.2, Cypress 15.17.0, Babel 7.29.7,
  sass-loader 17, css-minimizer-webpack-plugin 8, eslint-webpack-plugin 6).
- Migrate TypeScript 5.9 -> 6.0.3: set tsconfig rootDir, add
  ignoreDeprecations "6.0", scope include to src/components + src/@types, and
  declare *.scss/*.sass/*.css modules for stricter side-effect imports.
- Switch @babel/preset-react to the automatic JSX runtime and drop redundant
  React imports in stories and tests.
- Migrate ESLint from the deprecated .eslintrc.js to flat config
  (eslint.config.mjs) using typescript-eslint, @eslint/js, globals and the
  React/Storybook plugins. Keep ESLint at v9 because eslint-plugin-react does
  not support v10 yet. This fixes the previously broken lint (missing
  @typescript-eslint parser/plugin) and normalizes formatting.
- Fix a latent bug in .storybook/main.js (comma instead of semicolon joining
  two assignments via the comma operator).
- npm audit fix: 0 vulnerabilities.
- Bump package version to 1.4.0.

cypress.config.ts

@@ -1,15 +1,15 @@
-import { defineConfig } from "cypress";
+import { defineConfig } from 'cypress';
 import webpackConfig from './webpack.cy.config';
 
 export default defineConfig({
-  component: {
-    specPattern: 'src/**/*.cy.{js,jsx,ts,tsx}',
-    devServer: {
-      framework: "react",
-      bundler: "webpack",
-      webpackConfig: webpackConfig,
-    },
-    viewportWidth: 1280,
-    viewportHeight: 720,
-  },
+	component: {
+		specPattern: 'src/**/*.cy.{js,jsx,ts,tsx}',
+		devServer: {
+			framework: 'react',
+			bundler: 'webpack',
+			webpackConfig: webpackConfig,
+		},
+		viewportWidth: 1280,
+		viewportHeight: 720,
+	},
 });