Refactor tests and fix issues based on review feedback

This commit addresses several points raised during code review of the previously added unit tests:

- **Dependency Update:**
    - Updated `babel-jest` in `package.json` from beta version `^30.0.0-beta.3` to stable `^29.7.0` and ran `npm install`.

- **Bug Fix - `parseIntWithClamp` Call Sites:**
    - Corrected the parameter order in the two call sites of `parseIntWithClamp` in `src/popup/sections/AdvancedPart.jsx` to match the updated function signature `(value, min, max, defaultValue)`. This fixes a runtime bug where min/max/default values would have been misinterpreted.

- **Test Code Refinements:**
    - `src/utils/__tests__/is-edge.test.mjs`: Simplified comments in the legacy Edge user agent test for clarity. The test logic was already correct.
    - `src/utils/__tests__/is-firefox.test.mjs`:
        - Refactored `navigator.userAgent` mocking. The `beforeEach` now correctly defines `navigator.userAgent` as a configurable property with a getter/setter before `jest.spyOn(..., 'get')` is called.
        - The `afterEach` block now correctly restores the spy and the original `userAgent` property descriptor. This resolved test failures caused by the previous simplification attempt.
    - `src/utils/__tests__/model-name-convert.test.mjs`: Replaced two instances of the `delete` operator with direct assignment to `undefined` (e.g., `actualMockModels['claude'] = undefined;`) for performance reasons.

- **ESLint Configuration:**
    - Verified that the ESLint configuration (`.eslintrc.json`) correctly includes an override for test files (`src/utils/__tests__/**/*.mjs`, `*.test.mjs`) with `env: { jest: true, node: true }`. This ensures Jest global variables are recognized by the linter.

All linters and unit tests pass after these changes.

Author: google-labs-jules[bot]

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