Upgrade Angular from 9.0.1 to 10.2.5

[devin-ai-integration]

Upgrade Angular from 9.0.1 to 10.2.5

Summary

This PR upgrades the Angular framework from version 9.0.1 to 10.2.5 as the first step in an incremental modernization effort. The upgrade includes:

• All Angular packages: ~9.0.1 → ~10.2.5 (core, common, router, service-worker, etc.)
• Angular CLI & DevKit: ~9.0.2 → ~10.2.4 and ~0.900.2 → ~0.1002.4
• TypeScript: ~3.7.5 → ~3.9.7 (required for Angular 10)
• Node.js requirement in Travis CI: 6.9 → 12 (minimum for Angular 10)
• Testing dependencies: Updated karma, jasmine, protractor, tslint to Angular 10-compatible versions
• RxJS: ~6.5.4 → ~6.6.7
• Package manager: Switched from yarn to npm (yarn.lock deleted, package-lock.json created)
• Browserslist: Renamed from browserslist to .browserslistrc (Angular 10 convention)

⚠️ IMPORTANT LIMITATIONS:

• Manual upgrade - Environment issues prevented using ng update CLI tool, so package.json was updated manually. Automated code migrations were NOT applied.
• Testing incomplete - Environment issues prevented running unit tests, production builds, and service worker verification locally.
• Basic build verified - npm run build succeeds with NODE_OPTIONS=--openssl-legacy-provider flag.

Review & Testing Checklist for Human

This PR requires thorough manual testing due to incomplete verification during development. Please test:

• Run the development build locally - export NODE_OPTIONS=--openssl-legacy-provider && npm run build completes successfully
• Run the development server - npm start and verify the app loads at localhost:4200 without console errors
• Test all routes and features - Navigate through stories, comments, user profiles, all three themes (Default, Night, Black/AMOLED)
• Production build with service worker - Try to generate a production build and verify the service worker works (this is a PWA!)
• Review Angular 10 breaking changes - Check Angular 10 migration guide for breaking changes that might affect this codebase:
  • Input fields of type number now fire valueChanges only once per change
  • Templates with unknown properties now log errors instead of warnings
  • TypeScript 3.9 required (3.6-3.8 no longer supported)
• Check for automated migration opportunities - Since ng update couldn't run, there may be code patterns that need manual updates (missing decorators, ModuleWithProviders types, etc.)

Notes

Environment Issues Encountered:

1. Production builds fail - WASM error with source-map library when building with --configuration=production. Basic builds succeed.
2. Tests cannot run locally - ChromeHeadless browser fails to start (environment setup issue)
3. 31 pre-existing lint errors - These existed before the upgrade and are unrelated to this PR

Scripts from README don't exist:

• npm run precache (for service worker generation) - not in package.json
• npm run static-serve (for testing with service worker) - not in package.json

The README/CONTRIBUTING.md appear to reference an older setup. In Angular 10, service workers should be generated automatically during production builds when configured in angular.json.

Next Steps:
After this PR is merged and tested, the next incremental upgrade would be Angular 10 → 11, which requires TypeScript 4.0 and drops IE 9/10 support.

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Link to Devin run: https://app.devin.ai/sessions/fbf23d7e6b6d4992ad007f8c836a975c
Requested by: @kevintang513

[devin-ai-integration]

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[kevintang513]

Fix the WASM error