fix(frontend-lib): harden URL input parsing

- Extract URL input parsing and formatting into tested helpers
- Preserve pasted HTTP URLs, paths, query strings, and explicit ports
- Add Vitest coverage for URL input edge cases

easytier-web/frontend-lib/package.json

@@ -15,6 +15,7 @@
   "scripts": {
     "dev": "vite",
     "build": "vue-tsc -b && vite build",
+    "test": "vitest run",
     "preview": "vite preview"
   },
   "dependencies": {
@@ -43,10 +44,11 @@
     "typescript": "~5.6.3",
     "vite": "^5.4.21",
     "vite-plugin-dts": "^4.3.0",
+    "vitest": "^2.1.9",
     "vue-tsc": "^2.1.10"
   },
   "peerDependencies": {
     "vue": "^3.5.12",
     "primevue": "^4.3.9"
   }
-}
+}