chore(renovate): add frontend overlay with three-day release age (#142)

* chore(renovate): add Renovate frontend overlay config

* fix: adjust config results for TanStack, packageManager, and package.json

.github/renovate.json

@@ -0,0 +1,67 @@
+{
+  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+  "enabledManagers": ["npm", "custom.regex"],
+  "minimumReleaseAge": "3 days",
+  "internalChecksFilter": "strict",
+  "customManagers": [
+    {
+      "customType": "regex",
+      "description": "Playwright image tag in CI must match @playwright/test",
+      "managerFilePatterns": ["/^\\.github/workflows/ci\\.ya?ml$/"],
+      "matchStrings": [
+        "mcr\\.microsoft\\.com/playwright:v(?<currentValue>\\d+\\.\\d+\\.\\d+)-noble"
+      ],
+      "datasourceTemplate": "npm",
+      "depNameTemplate": "@playwright/test",
+      "versioningTemplate": "npm"
+    }
+  ],
+  "packageRules": [
+    {
+      "description": ["Do not open major or replacement PRs until approved on the dashboard"],
+      "matchUpdateTypes": ["major", "replacement"],
+      "dependencyDashboardApproval": true
+    },
+    {
+      "description": [
+        "Do not open Playwright PRs until approved; image and upload-artifact share a Node runtime"
+      ],
+      "matchPackageNames": ["@playwright/test"],
+      "dependencyDashboardApproval": true,
+      "groupName": "playwright"
+    },
+    {
+      "description": ["Keep MUI packages together"],
+      "matchPackageNames": ["@mui/**"],
+      "matchUpdateTypes": ["major"],
+      "groupName": "mui"
+    },
+    {
+      "description": ["Keep React and its type packages together"],
+      "matchPackageNames": ["react", "react-dom", "@types/react", "@types/react-dom"],
+      "matchUpdateTypes": ["major"],
+      "groupName": "react"
+    },
+    {
+      "description": ["Keep FullCalendar packages together"],
+      "matchPackageNames": ["@fullcalendar/**"],
+      "matchUpdateTypes": ["major"],
+      "groupName": "fullcalendar"
+    },
+    {
+      "description": ["Do not bump package.json engines"],
+      "matchDepTypes": ["engines"],
+      "enabled": false
+    },
+    {
+      "description": ["Do not bump packageManager"],
+      "matchDepTypes": ["packageManager"],
+      "enabled": false
+    },
+    {
+      "description": ["Keep TanStack Query packages on one version"],
+      "matchPackageNames": ["@tanstack/**"],
+      "groupName": "tanstack query"
+    }
+  ]
+}