Fix biome lint: update schema to 2.3.13, exclude npm dir, fix lint errors

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

biome.json

@@ -1,5 +1,5 @@
 {
-  "$schema": "https://biomejs.dev/schemas/2.3.11/schema.json",
+  "$schema": "https://biomejs.dev/schemas/2.3.13/schema.json",
   "linter": {
     "enabled": true,
     "rules": {
@@ -48,7 +48,8 @@
       "!src-web/routeTree.gen.ts",
       "!packages/plugin-runtime-types/lib",
       "!**/bindings",
-      "!flatpak"
+      "!flatpak",
+      "!npm"
     ]
   }
 }