config: properly configure ESLint for .svelte.ts files

- Install svelte-eslint-parser package
- Add dedicated ESLint configuration for .svelte.ts files
- Configure Svelte parser with TypeScript support for runes
- Remove file ignores - all source files are now properly linted

package.json

@@ -37,6 +37,7 @@
     "prettier-plugin-svelte": "^3.3.3",
     "svelte": "^5.43.8",
     "svelte-check": "^4.3.4",
+    "svelte-eslint-parser": "^1.6.0",
     "tailwindcss": "^4.1.17",
     "tw-animate-css": "^1.4.0",
     "typescript": "^5.9.3",