Add unit tests for utility functions and fix linting issues

This commit introduces unit tests for several functions within the src/utils directory.
Jest has been configured as the testing framework. ESLint has also been updated to correctly lint the new test files.

The following functions now have unit tests:
- endsWithQuestionMark: Verifies correct identification of strings ending with various types of question marks.
- parseIntWithClamp: Ensures correct parsing and clamping of integer values.
- Browser detection functions (isFirefox, isEdge, isMobile, isSafari): Validates browser identification logic using mock browser environments.
- model-name-convert: Tests API mode to model name conversion, model name to description, and new helper functions isGPT4 and isClaude3 (which were also implemented as part of this effort).
- getClientPosition: Confirms the function returns the correct client coordinates.
- getConversationPairs: Checks the transformation of conversation records into different formats.

During the testing process, minor bugs were identified and fixed:
- Corrected parameter order in `parseIntWithClamp`.
- Ensured `endsWithQuestionMark` handles strings with leading/trailing whitespace.

Linting issues related to Jest global variables in test files were resolved by updating the `.eslintrc.json` configuration to include a Jest environment for test files.

All unit tests pass, and the codebase now adheres to the linting standards. Code coverage has been significantly improved for the tested utility functions.

Author: google-labs-jules[bot]

.eslintrc.json

@@ -4,7 +4,15 @@
     "es2021": true
   },
   "extends": ["eslint:recommended", "plugin:react/recommended"],
-  "overrides": [],
+  "overrides": [
+    {
+      "files": ["src/utils/__tests__/**/*.mjs", "*.test.mjs"],
+      "env": {
+        "jest": true,
+        "node": true
+      }
+    }
+  ],
   "parserOptions": {
     "ecmaVersion": "latest",
     "sourceType": "module"

coverage/lcov-report/ends-with-question-mark.mjs.html

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+                at 2025-06-07T14:07:35.126Z
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coverage/lcov-report/get-client-position.mjs.html

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+                at 2025-06-07T14:07:35.126Z
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coverage/lcov-report/get-conversation-pairs.mjs.html

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                 Code coverage generated by
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-                at 2025-06-07T14:03:53.127Z
+                at 2025-06-07T14:07:35.126Z
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coverage/lcov-report/index.html

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-                at 2025-06-07T14:03:53.127Z
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coverage/lcov-report/is-edge.mjs.html

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                 Code coverage generated by
                 <a href="https://istanbul.js.org/" target="_blank" rel="noopener noreferrer">istanbul</a>
-                at 2025-06-07T14:03:53.127Z
+                at 2025-06-07T14:07:35.126Z
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coverage/lcov-report/is-firefox.mjs.html

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-                at 2025-06-07T14:03:53.127Z
+                at 2025-06-07T14:07:35.126Z
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coverage/lcov-report/is-mobile.mjs.html

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                 Code coverage generated by
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-                at 2025-06-07T14:03:53.127Z
+                at 2025-06-07T14:07:35.126Z
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coverage/lcov-report/is-safari.mjs.html

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                 Code coverage generated by
                 <a href="https://istanbul.js.org/" target="_blank" rel="noopener noreferrer">istanbul</a>
-                at 2025-06-07T14:03:53.127Z
+                at 2025-06-07T14:07:35.126Z
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coverage/lcov-report/model-name-convert.mjs.html

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                 Code coverage generated by
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-                at 2025-06-07T14:03:53.127Z
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