feat: show recipe source link, keep screen awake while viewing a recipe

- sourceUrl was already saved on URL import but never displayed —
  render it as a link (hostname only) under the description.
- Extract cook-mode's wake lock into a reusable useWakeLock hook, add
  visibility-change re-acquisition (a wake lock releases when the tab
  goes background and won't come back on its own), and use it on the
  regular recipe view too, not just cook mode.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

apps/web/app/(app)/recipes/[id]/page.tsx

@@ -29,6 +29,7 @@ import { CommentsSection } from "@/components/social/comments-section";
 import { getPublicUrl } from "@/lib/storage";
 import { cn } from "@/lib/utils";
 import { RecipeChatPanel } from "@/components/recipe/recipe-chat-panel";
+import { KeepScreenAwake } from "@/components/recipe/keep-screen-awake";
 import { getMessages, formatMessage } from "@/lib/i18n/server";
 
 type Params = { params: Promise<{ id: string }> };
@@ -86,6 +87,7 @@ export default async function RecipePage({ params }: Params) {
 
   return (
     <div className="max-w-4xl mx-auto space-y-8">
+      <KeepScreenAwake />
       {/* Header */}
       <div className="space-y-4">
         <h1 className="text-3xl font-bold tracking-tight">{recipe.title}</h1>
@@ -200,6 +202,18 @@ export default async function RecipePage({ params }: Params) {
           <p className="text-muted-foreground leading-relaxed">{recipe.description}</p>
         )}
 
+        {recipe.sourceUrl && (
+          <a
+            href={recipe.sourceUrl}
+            target="_blank"
+            rel="noopener noreferrer nofollow"
+            className="inline-flex items-center gap-1 text-xs text-muted-foreground hover:text-foreground underline underline-offset-4"
+          >
+            <ExternalLink className="h-3 w-3" />
+            {m.recipe.source}: {new URL(recipe.sourceUrl).hostname.replace(/^www\./, "")}
+          </a>
+        )}
+
         <div className="flex flex-wrap items-center gap-3 text-sm">
           {recipe.difficulty && (
             <Badge variant={DIFFICULTY_COLOR[recipe.difficulty]}>{m.recipe.difficulty[recipe.difficulty]}</Badge>