feat: add product concept subtitle to radars

A Radar gains an optional Concept — a short subtitle naming the product
and its typical performances, rendered under the title and wrapping to a
balanced second line when long. Old radars default to an empty Concept
on load.

package.json

@@ -1,12 +1,16 @@
 {
   "name": "product-radar",
-  "private": true,
   "version": "0.0.0",
+  "private": true,
   "type": "module",
   "scripts": {
     "dev": "vite",
     "build": "vue-tsc -b && vite build",
-    "preview": "vite preview"
+    "preview": "vite preview",
+    "lint": "oxlint",
+    "lint:fix": "oxlint --fix",
+    "fmt": "oxfmt",
+    "fmt:check": "oxfmt --check"
   },
   "dependencies": {
     "daisyui": "^5.5.23",
@@ -18,6 +22,8 @@
     "@types/node": "^24.12.3",
     "@vitejs/plugin-vue": "^6.0.6",
     "@vue/tsconfig": "^0.9.1",
+    "oxfmt": "^0.55.0",
+    "oxlint": "^1.70.0",
     "tailwindcss": "^4.3.1",
     "typescript": "~6.0.2",
     "vite": "^8.0.12",