Automatically remove unused imports

[rileytomasek]

Update the configuration so that unused imports in code are automatically removed when run in fix mode.

[rileytomasek]

@CharlieHelps you here?

[charliecreates]

Added eslint-plugin-unused-imports and configured ESLint to:

• automatically delete unused import lines (unused-imports/no-unused-imports)
• replace the old vars check with the plugin variant (unused-imports/no-unused-vars)

Running bun run fix (or npm run fix) now trims unused imports for you.