ESlint web fixes

[brettedw]

This PR fixes ESLint configuration issues in web so React and TypeScript linting work

• Fixed the web ESLint config so it is actually loaded by ESLint.
• Migrated the config from CommonJS to ESM by renaming eslint.config.cjs to eslint.config.js.
• Scoped the TS/React lint rules to src/**/*.{ts,tsx} so the ESLint config file itself is not linted as application code.
• Disabled outdated React JSX scope rules for the automatic JSX runtime:
  • react/react-in-jsx-scope
  • react/jsx-uses-react

Why

The web ESLint setup had a few issues that prevented expected lint feedback:

• the config had an invalid export/config shape
• ESLint 9 flat config expected files to be an array
• ESLint config no longer reports require()-style import warnings

These issues caused missing or misleading lint output in VS Code, especially for React hook warnings

Test Links:

Landing Page
MoreCast
Percentile Calculator
C-Haines
FireCalc
FireCalc bookmark
Auto Spatial Advisory (ASA)
HFI Calculator
SFMS Insights
Fire Watch

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud