⚙️ Upgrade eslint config to v9

.eslintignore

@@ -1,13 +0,0 @@
-.DS_Store
-node_modules
-/build
-/.svelte-kit
-/package
-.env
-.env.*
-!.env.example
-
-# Ignore files for PNPM, NPM and YARN
-pnpm-lock.yaml
-package-lock.json
-yarn.lock

eslint.config.js

@@ -1,11 +1,17 @@
-import js from '@eslint/js';
-import ts from 'typescript-eslint';
-import svelte from 'eslint-plugin-svelte';
-import prettier from 'eslint-config-prettier';
+import { fileURLToPath } from 'node:url';
 import globals from 'globals';
 
-/** @type {import('eslint').Linter.Config[]} */
-export default [
+import js from '@eslint/js';
+import { includeIgnoreFile } from '@eslint/compat';
+import ts from 'typescript-eslint';
+
+import svelte from 'eslint-plugin-svelte';
+import prettier from 'eslint-config-prettier';
+
+const gitignorePath = fileURLToPath(new URL('./.gitignore', import.meta.url));
+
+export default ts.config(
+  includeIgnoreFile(gitignorePath),
   js.configs.recommended,
   ...ts.configs.recommended,
   ...svelte.configs['flat/recommended'],
@@ -26,8 +32,5 @@ export default [
         parser: ts.parser
       }
     }
-  },
-  {
-    ignores: ['build/', '.svelte-kit/', 'dist/']
   }
-];
+);