Upgrade to Svelte 5, SvelteKit 2, and Tailwind 4 with modern patterns

Co-authored-by: lukeslakemail <lukeslakemail@gmail.com>

sveltekit-integration/eslint.config.js

@@ -0,0 +1,41 @@
+import js from '@eslint/js';
+import ts from 'typescript-eslint';
+import svelte from 'eslint-plugin-svelte';
+import prettier from 'eslint-config-prettier';
+import globals from 'globals';
+
+/** @type {import('eslint').Linter.Config[]} */
+export default [
+	js.configs.recommended,
+	...ts.configs.recommended,
+	...svelte.configs['flat/recommended'],
+	prettier,
+	...svelte.configs['flat/prettier'],
+	{
+		languageOptions: {
+			globals: {
+				...globals.browser,
+				...globals.node
+			}
+		}
+	},
+	{
+		files: ['**/*.svelte'],
+		languageOptions: {
+			parserOptions: {
+				parser: ts.parser
+			}
+		}
+	},
+	{
+		ignores: ['build/', '.svelte-kit/', 'dist/']
+	},
+	{
+		rules: {
+			// Svelte 5 specific rules
+			'svelte/valid-compile': ['error', { ignoreWarnings: false }],
+			'@typescript-eslint/no-unused-vars': ['error', { argsIgnorePattern: '^_' }],
+			'@typescript-eslint/no-explicit-any': 'warn'
+		}
+	}
+];