feature: favicon per site

.gitignore

@@ -47,3 +47,6 @@ next-env.d.ts
 /media
 
 *storybook.log
+
+# Generated per-site favicon (copied from sites/<NEXT_PUBLIC_SITE_ID>/icon.ico by scripts/copy-favicon.mjs)
+/src/app/(home)/icon.ico

package.json

@@ -5,9 +5,11 @@
   "license": "MIT",
   "type": "module",
   "scripts": {
+    "prebuild": "node --env-file-if-exists=.env scripts/copy-favicon.mjs",
     "build": "cross-env NODE_OPTIONS=--no-deprecation next build",
+    "predev": "node --env-file-if-exists=.env scripts/copy-favicon.mjs",
     "dev": "cross-env NODE_OPTIONS=--no-deprecation next dev",
-    "devsafe": "rm -rf .next && cross-env NODE_OPTIONS=--no-deprecation next dev",
+    "devsafe": "rm -rf .next && node --env-file-if-exists=.env scripts/copy-favicon.mjs && cross-env NODE_OPTIONS=--no-deprecation next dev",
     "generate:types": "payload generate:types",
     "lint": "cross-env NODE_OPTIONS=--no-deprecation next lint",
     "payload": "cross-env NODE_OPTIONS=--no-deprecation payload",

scripts/copy-favicon.mjs

@@ -0,0 +1,34 @@
+// White-labeling glue: each client under sites/<id>/ ships its own icon.ico.
+// Next.js's App Router picks up the favicon via the file convention at
+// src/app/(home)/icon.ico, which can only point to one file. This script runs
+// before `next dev` / `next build` (see predev/prebuild in package.json) and
+// copies the right per-site icon into that location based on NEXT_PUBLIC_SITE_ID.
+// The destination is gitignored so it's treated as a build artifact.
+
+import { copyFileSync, existsSync, readdirSync, statSync } from 'node:fs'
+import { dirname, join, resolve } from 'node:path'
+import { fileURLToPath } from 'node:url'
+
+const __dirname = dirname(fileURLToPath(import.meta.url))
+const repoRoot = resolve(__dirname, '..')
+
+// Mirror the default in src/config/site.ts so an unset env var produces the
+// same site here as it does at runtime.
+const siteId = process.env.NEXT_PUBLIC_SITE_ID || 'dreikoenige'
+const sitesDir = join(repoRoot, 'sites')
+const source = join(sitesDir, siteId, 'icon.ico')
+const destination = join(repoRoot, 'src', 'app', '(home)', 'icon.ico')
+
+// Fail loudly with the list of valid site ids — same UX as the runtime check
+// in src/config/site.ts when an unknown NEXT_PUBLIC_SITE_ID is supplied.
+if (!existsSync(source)) {
+  const available = readdirSync(sitesDir)
+    .filter((entry) => statSync(join(sitesDir, entry)).isDirectory())
+    .join(', ')
+  throw new Error(
+    `[copy-favicon] No icon.ico for site "${siteId}" at ${source}. Available sites: ${available}`,
+  )
+}
+
+copyFileSync(source, destination)
+console.log(`[copy-favicon] ${siteId} → src/app/(home)/icon.ico`)