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.

vite.config.ts

@@ -1,6 +1,6 @@
-import { defineConfig } from 'vite'
-import vue from '@vitejs/plugin-vue'
-import tailwindcss from '@tailwindcss/vite'
+import { defineConfig } from "vite"
+import vue from "@vitejs/plugin-vue"
+import tailwindcss from "@tailwindcss/vite"
 
 // https://vite.dev/config/
 export default defineConfig({