feat: Migrate ESLint to flat config and resolve initial linting errors

Migrated the ESLint configuration to the new flat config format ()
and addressed several initial linting errors.

Key changes include:
- Updated ESLint configuration to treat  as warnings instead of errors.
- Fixed  errors in  by declaring  and .
- Corrected  error in  by using  instead of an out-of-scope .
- Resolved  error in  by replacing the undefined  directive with the  component.
- Addressed  errors in  by replacing  with  and  with .
- Fixed  errors in  by importing necessary modules (, , ) and adding missing props (, , , , ).

eslint.config.cjs

@@ -0,0 +1,71 @@
+const { defineConfig, globalIgnores } = require('eslint/config');
+
+const tsParser = require('@typescript-eslint/parser');
+const typescriptEslint = require('@typescript-eslint/eslint-plugin');
+const globals = require('globals');
+const parser = require('svelte-eslint-parser');
+const js = require('@eslint/js');
+
+const { FlatCompat } = require('@eslint/eslintrc');
+
+const compat = new FlatCompat({
+	baseDirectory: __dirname,
+	recommendedConfig: js.configs.recommended,
+	allConfig: js.configs.all
+});
+
+module.exports = defineConfig([
+	{
+		extends: compat.extends(
+			'eslint:recommended',
+			'plugin:@typescript-eslint/recommended',
+			'prettier'
+		),
+
+		languageOptions: {
+			parser: tsParser,
+			sourceType: 'module',
+			ecmaVersion: 2020,
+
+			parserOptions: {
+				extraFileExtensions: ['.svelte']
+			},
+
+			globals: {
+				...globals.browser,
+				...globals.node
+			}
+		},
+
+		plugins: {
+			'@typescript-eslint': typescriptEslint
+		},
+		rules: {
+			'@typescript-eslint/no-unused-vars': 'warn'
+		}
+	},
+	{
+		files: ['**/*.svelte'],
+
+		languageOptions: {
+			parser: parser,
+
+			parserOptions: {
+				parser: '@typescript-eslint/parser'
+			}
+		}
+	},
+	globalIgnores([
+		'**/.DS_Store',
+		'**/node_modules',
+		'build',
+		'.svelte-kit',
+		'package',
+		'**/.env',
+		'**/.env.*',
+		'!**/.env.example',
+		'**/pnpm-lock.yaml',
+		'**/package-lock.json',
+		'**/yarn.lock'
+	])
+]);