Fix linting and formatting inconsistencies across codebase

[justin808]

Background

During the Babel to SWC migration (#666), we discovered several files with formatting inconsistencies that don't match the project's Prettier and ESLint configurations.

Files with Formatting Issues

The following files have formatting that doesn't match current linter rules:

• client/app/packs/server-bundle.js - Uses double quotes instead of single quotes
• config/webpack/clientWebpackConfig.js - Missing proper file ending
• config/webpack/commonWebpackConfig.js - Inconsistent line wrapping and trailing commas
• config/webpack/development.js - Extra blank lines
• client/app/bundles/comments/rescript/RescriptShow/ror_components/RescriptShow.jsx - ReScript-generated file with double quotes

Proposed Solution

Create a focused PR to:

1. Run yarn lint --fix across the entire codebase
2. Fix any linting errors that can't be auto-fixed
3. Ensure all files conform to .prettierrc.yml and .eslintrc rules
4. Consider updating .prettierignore to exclude ReScript-generated files if needed

Why Separate PR?

• Keeps PRs focused on specific changes
• Makes code review easier
• Separates functional changes from formatting changes
• Establishes a clean baseline for future linting

Acceptance Criteria

• All files pass yarn lint without warnings
• All files pass bundle exec rubocop without offenses
• Formatting is consistent across the codebase
• CI linting checks pass