fix(deps): add @swc/helpers as explicit dependency (#306)

next@16 lists @swc/helpers@0.5.15 in its own dependencies but npm's
deduplication during global install fails to place it in the omniroute
app's node_modules when hoisted. This causes MODULE_NOT_FOUND for
@swc/helpers/esm/_interop_require_default.js on startup.

Fix: add @swc/helpers@0.5.19 to omniroute's top-level dependencies and
overrides so npm guarantees its presence regardless of hoisting strategy.
Reproducible on Windows (Node 22) and Linux.

package-lock.json

@@ -15,6 +15,7 @@
       "dependencies": {
         "@modelcontextprotocol/sdk": "^1.27.1",
         "@monaco-editor/react": "^4.7.0",
+        "@swc/helpers": "0.5.19",
         "bcryptjs": "^3.0.3",
         "better-sqlite3": "^12.6.2",
         "bottleneck": "^2.19.5",

package.json

@@ -109,7 +109,8 @@
     "uuid": "^13.0.0",
     "wreq-js": "^2.0.1",
     "zod": "^4.3.6",
-    "zustand": "^5.0.10"
+    "zustand": "^5.0.10",
+    "@swc/helpers": "0.5.19"
   },
   "devDependencies": {
     "@playwright/test": "^1.58.2",
@@ -142,6 +143,6 @@
     ]
   },
   "overrides": {
-    "@swc/helpers": "^0.5.19"
+    "@swc/helpers": "0.5.19"
   }
 }