fix: upgrade workbox-webpack-plugin from v6 to v7

[Kristianwhittick]

Summary

Upgrades workbox-webpack-plugin from v6.4.1 to v7.4.0 to resolve deprecation warnings.

Motivation

• Resolves deprecation warning for rollup-plugin-terser (v7 uses @rollup/plugin-terser)
• Resolves deprecation warnings for workbox-cacheable-response and workbox-background-sync
• workbox-google-analytics updated to v7 (still present but maintained version)

Changes

• Updated workbox-webpack-plugin from ^6.4.1 to ^7.4.0 in react-scripts package.json

Testing

• ✅ Build succeeds
• ✅ Service worker generation works
• ✅ No breaking changes in API usage

Resolves

• Addresses rollup-plugin-terser deprecation (Full Windows support #7)
• Addresses workbox package deprecations (Remove purely stylistic ESLint rules #20)

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