fix: ignore third-party map component from linting

The mapcn-svelte component at src/lib/components/ui/map/ is a
third-party library, not our code. Add to eslint ignores so we
don't need to maintain eslint-disable comments in imported code.

frontend/eslint.config.js

@@ -12,6 +12,9 @@ const gitignorePath = fileURLToPath(new URL('./.gitignore', import.meta.url));
 
 export default defineConfig(
 	includeIgnoreFile(gitignorePath),
+	{
+		ignores: ['src/lib/components/ui/map/']
+	},
 	js.configs.recommended,
 	...ts.configs.recommended,
 	...svelte.configs.recommended,