Add tests for S7759 based on ruling analysis

Add test cases derived from real-world polyfill patterns found during
ruling analysis:
- Chained ternary polyfill (performance.now || Date.now || fallback)
- Class static property with ternary polyfill
- Export const with Date.now polyfill

The implementation correctly handles all 48 ruling entries with no
mismatches between expected and actual behavior.

Author: Vibe Bot

packages/jsts/src/rules/README.md

@@ -557,7 +557,6 @@ SonarJS uses some rules are not shipped in this ESLint plugin to avoid duplicati
 | [S7756](https://sonarsource.github.io/rspec/#/rspec/S7756/javascript) | [unicorn/prefer-blob-reading-methods](https://github.com/sindresorhus/eslint-plugin-unicorn/blob/HEAD/docs/rules/prefer-blob-reading-methods.md)                                            |
 | [S7757](https://sonarsource.github.io/rspec/#/rspec/S7757/javascript) | [unicorn/prefer-class-fields](https://github.com/sindresorhus/eslint-plugin-unicorn/blob/HEAD/docs/rules/prefer-class-fields.md)                                                            |
 | [S7758](https://sonarsource.github.io/rspec/#/rspec/S7758/javascript) | [unicorn/prefer-code-point](https://github.com/sindresorhus/eslint-plugin-unicorn/blob/HEAD/docs/rules/prefer-code-point.md)                                                                |
-| [S7759](https://sonarsource.github.io/rspec/#/rspec/S7759/javascript) | [unicorn/prefer-date-now](https://github.com/sindresorhus/eslint-plugin-unicorn/blob/HEAD/docs/rules/prefer-date-now.md)                                                                    |
 | [S7760](https://sonarsource.github.io/rspec/#/rspec/S7760/javascript) | [unicorn/prefer-default-parameters](https://github.com/sindresorhus/eslint-plugin-unicorn/blob/HEAD/docs/rules/prefer-default-parameters.md)                                                |
 | [S7761](https://sonarsource.github.io/rspec/#/rspec/S7761/javascript) | [unicorn/prefer-dom-node-dataset](https://github.com/sindresorhus/eslint-plugin-unicorn/blob/HEAD/docs/rules/prefer-dom-node-dataset.md)                                                    |
 | [S7762](https://sonarsource.github.io/rspec/#/rspec/S7762/javascript) | [unicorn/prefer-dom-node-remove](https://github.com/sindresorhus/eslint-plugin-unicorn/blob/HEAD/docs/rules/prefer-dom-node-remove.md)                                                      |
@@ -659,6 +658,7 @@ The following rules are used in SonarJS but not available in this ESLint plugin.
 | [S7727](https://sonarsource.github.io/rspec/#/rspec/S7727/javascript) | [unicorn/no-array-callback-reference](https://github.com/sindresorhus/eslint-plugin-unicorn/blob/HEAD/docs/rules/no-array-callback-reference.md)                                                                                                                                                                                                                                        |
 | [S7728](https://sonarsource.github.io/rspec/#/rspec/S7728/javascript) | [unicorn/no-array-for-each](https://github.com/sindresorhus/eslint-plugin-unicorn/blob/HEAD/docs/rules/no-array-for-each.md)                                                                                                                                                                                                                                                            |
 | [S7755](https://sonarsource.github.io/rspec/#/rspec/S7755/javascript) | [unicorn/prefer-at](https://github.com/sindresorhus/eslint-plugin-unicorn/blob/HEAD/docs/rules/prefer-at.md)                                                                                                                                                                                                                                                                            |
+| [S7759](https://sonarsource.github.io/rspec/#/rspec/S7759/javascript) | [unicorn/prefer-date-now](https://github.com/sindresorhus/eslint-plugin-unicorn/blob/HEAD/docs/rules/prefer-date-now.md)                                                                                                                                                                                                                                                                |
 | [S7763](https://sonarsource.github.io/rspec/#/rspec/S7763/javascript) | [unicorn/prefer-export-from](https://github.com/sindresorhus/eslint-plugin-unicorn/blob/HEAD/docs/rules/prefer-export-from.md)                                                                                                                                                                                                                                                          |
 
 <!--- end decorated rules -->

packages/jsts/src/rules/S7759/unit.test.ts

@@ -66,6 +66,21 @@ describe('S7759', () => {
         {
           code: `var timestamp = Date.now();`,
         },
+
+        // Chained ternary polyfill (from TypeScript real-world usage)
+        {
+          code: `var timestamp = typeof performance !== "undefined" && performance.now ? function() { return performance.now(); } : Date.now ? Date.now : function() { return +(new Date()); };`,
+        },
+
+        // Class static property with ternary polyfill (from rxjs real-world usage)
+        {
+          code: `class Scheduler { static now = Date.now ? Date.now : () => +new Date(); }`,
+        },
+
+        // Export with Date.now polyfill (from qunit real-world usage)
+        {
+          code: `export const now = Date.now || function() { return new Date().getTime(); };`,
+        },
       ],
       invalid: [
         // Direct usage without polyfill pattern should still report