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.

.storybook/preview.js

@@ -1,29 +1,29 @@
 export const parameters = {
-  actions: { argTypesRegex: "^on[A-Z].*" },
-  controls: {
-    matchers: {
-      color: /(background|color)$/i,
-      date: /Date$/,
-    },
-  },
-  docs: {
-    extractArgTypes: (component) => {
-      // Filter out Symbol values to prevent serialization errors
-      const argTypes = {};
-      if (component && component.propTypes) {
-        Object.keys(component.propTypes).forEach(key => {
-          const propType = component.propTypes[key];
-          // Only include non-Symbol values
-          if (typeof propType !== 'symbol') {
-            argTypes[key] = propType;
-          }
-        });
-      }
-      return argTypes;
-    },
-    source: {
-      excludeDecorators: true,
-    },
-  },
-}
-export const tags = ["autodocs"];
+	actions: { argTypesRegex: '^on[A-Z].*' },
+	controls: {
+		matchers: {
+			color: /(background|color)$/i,
+			date: /Date$/,
+		},
+	},
+	docs: {
+		extractArgTypes: (component) => {
+			// Filter out Symbol values to prevent serialization errors
+			const argTypes = {};
+			if (component && component.propTypes) {
+				Object.keys(component.propTypes).forEach(key => {
+					const propType = component.propTypes[key];
+					// Only include non-Symbol values
+					if (typeof propType !== 'symbol') {
+						argTypes[key] = propType;
+					}
+				});
+			}
+			return argTypes;
+		},
+		source: {
+			excludeDecorators: true,
+		},
+	},
+};
+export const tags = ['autodocs'];