chore: remove deprecated react-hot-loader

[rusackas]

User description

Summary

This PR removes the deprecated react-hot-loader package since React Refresh is already configured and working in the project via the SWC loader.

Changes:

• Removed react-hot-loader dependency from package.json
• Removed hot() wrapper from App.tsx
• Removed setHotLoaderConfig from preamble.ts
• Removed react-hot-loader/babel plugin from babel.config.js
• Removed react-hot-loader from webpack vendor bundle
• Cleaned up related comments

Before/After

Before: Project had both react-hot-loader (deprecated) and React Refresh configured After: Only React Refresh is used for hot module replacement

Testing Instructions

1. Run npm run dev-server
2. Make changes to React components
3. Verify hot module replacement works correctly (components update without full page refresh)
4. Verify no console errors related to hot module replacement

✅ Tested locally: Dev server compiles successfully and HMR works as expected.

Additional Information

React Refresh has been the recommended HMR solution for React since React 17. The react-hot-loader package is deprecated and no longer maintained. This migration simplifies our development setup by removing unnecessary dependencies.

🤖 Generated with Claude Code

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CodeAnt-AI Description

Remove deprecated react-hot-loader and add dependency-checker tool

What Changed

• Removed react-hot-loader and all references (package.json, package-lock, babel plugin, webpack vendor list, and hot() wrapper); development hot module replacement continues to work via React Refresh.
• Dev server no longer triggers deprecated react-hot-loader warnings and the dev vendor bundle no longer contains react-hot-loader, reducing the development bundle size.
• Added a new CLI script (scripts/check-dependencies.py) and an agent doc (AGENTS/dependency-checker.md) that scan the frontend codebase for unused or transitive npm dependencies and produce human-readable and JSON reports with keep/remove/investigate recommendations.

Impact

✅ No deprecated HMR warnings in dev server ✅ Smaller dev vendor bundle during development ✅ Easier detection of unused frontend dependencies

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Nitpicks 🔍

🔒 No security issues identified

⚡ Recommended areas for review [ ] Questionable Logic When dependents are found in package-lock, analyze_dependency sets status 'transitive-only' and recommendation 'remove'. This is counterintuitive: if other packages depend on this package, removing it may break those dependents or conversely it may be safe to remove if it's provided transitively. This behavior should be documented or re-checked to ensure the recommendation is correct. [ ] Missing file handling Opening package.json and package-lock.json is done without checking existence or handling JSON decoding errors. If the provided --path is incorrect or files are missing/corrupt the script will raise an unhandled exception. Consider early checks and clearer error messages or safe fallbacks. [ ] Fragile config file reading The code opens all matching config files without try/except; unreadable files or directories (or binary/large files) could raise exceptions. Also glob patterns may match unexpected files. Consider guarding file reads and skipping non-regular files. [ ] Build / config residue Ensure all build-tooling and config (SWC/Babel/webpack) have been updated consistently to use React Refresh instead of react-hot-loader. Confirm there are no remaining references or plugins that assume react-hot-loader (imports, babel plugins, vendor bundles, or webpack aliases). [ ] Removed import audit The import for react-hot-loader was removed. Make sure there are no remaining references elsewhere in the codebase or build config (Babel, webpack, vendor lists). A quick search and CI build check should confirm there are no missing symbols. [ ] HMR behavior change Removing the react-hot-loader wrapper and exporting the raw App relies on React Refresh behavior. Verify that HMR preserves component state and update behavior across the app (particularly for any class components and legacy code paths that relied on react-hot-loader's advanced state-preservation behavior). [ ] Performance Issue The search_for_imports routine invokes ripgrep/grep once per pattern per source path per package. For large dependency lists this results in many separate subprocess calls and repeated scanning of the same directories, which is slow. Consider batching patterns into a single rg invocation or searching once per package and post-filtering results. [ ] Empty dev block The development-only conditional no longer executes any code and only contains a comment. This is a code smell (and can trigger linter warnings). Either remove the conditional entirely or make it do a minimal runtime check (e.g. verify HMR is available) so the intent is explicit.

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