Fix issues and add linting

eslint.config.js

@@ -0,0 +1,34 @@
+import js from '@eslint/js';
+import tseslint from 'typescript-eslint';
+
+export default tseslint.config(
+  // Global ignores
+  {
+    ignores: [
+      'dist/**',
+      'server/dist/**',
+      '.astro/**',
+      'node_modules/**',
+      'scripts/**',
+    ],
+  },
+
+  // Base recommended rules
+  js.configs.recommended,
+  ...tseslint.configs.recommended,
+
+  // Project-wide overrides
+  {
+    rules: {
+      // Allow unused vars/args when prefixed with _
+      '@typescript-eslint/no-unused-vars': ['warn', {
+        argsIgnorePattern: '^_',
+        varsIgnorePattern: '^_',
+      }],
+      // Empty catch blocks are intentional in this codebase (fail-through patterns)
+      'no-empty': ['error', { allowEmptyCatch: true }],
+      // We use unknown instead of any; warn when any slips in
+      '@typescript-eslint/no-explicit-any': 'warn',
+    },
+  },
+);