feat: collections visibility enum (matches recipes) + QR on collection PDF (v0.54.0)

Replaces collections.isPublic (boolean) with collections.visibility
(private/unlisted/public/followers — same enum recipes use). Two-step
migration (0050 adds+backfills, 0051 drops isPublic) since drizzle-kit's
add+drop-in-one-diff rename heuristic needs an interactive prompt we
can't satisfy here.

New collectionVisibleToViewer(viewerId) in lib/visibility.ts mirrors the
existing recipe helper (author always sees own; public/unlisted visible
to anyone; followers-only via the same user_follows EXISTS pattern) —
used by the collection detail page, its print view, fork, and favorite,
replacing their old `or(isPublic, own)` checks.

Create/edit collection dialogs get the same 4-option visibility select
as the recipe form instead of a public/private checkbox.

Collection PDF export now generates a QR code (qrcode, same as the
recipe PDF) linking to /collections/{id}, shown only when visibility is
public/unlisted — same "would an anonymous scanner actually resolve
this" rule as the recipe QR.

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

apps/web/components/collections/edit-collection-dialog.tsx

@@ -12,23 +12,26 @@ import { Textarea } from "@/components/ui/textarea";
 import { Label } from "@/components/ui/label";
 import { Dialog, DialogContent, DialogFooter, DialogHeader, DialogTitle } from "@/components/ui/dialog";
 
+type Visibility = "private" | "unlisted" | "public" | "followers";
+
 export function EditCollectionDialog({
   collectionId,
   initialName,
   initialDescription,
   initialNotes,
   initialTags,
-  initialIsPublic,
+  initialVisibility,
 }: {
   collectionId: string;
   initialName: string;
   initialDescription: string | null;
   initialNotes: string | null;
   initialTags: string[];
-  initialIsPublic: boolean;
+  initialVisibility: Visibility;
 }) {
   const t = useTranslations("collections");
   const tRecipeForm = useTranslations("recipeForm");
+  const tRecipe = useTranslations("recipe");
   const tCommon = useTranslations("common");
   const router = useRouter();
   const [open, setOpen] = useState(false);
@@ -37,7 +40,7 @@ export function EditCollectionDialog({
   const [notes, setNotes] = useState(initialNotes ?? "");
   const [tags, setTags] = useState<string[]>(initialTags);
   const [tagInput, setTagInput] = useState("");
-  const [isPublic, setIsPublic] = useState(initialIsPublic);
+  const [visibility, setVisibility] = useState<Visibility>(initialVisibility);
   const [saving, setSaving] = useState(false);
   const tagInputRef = useRef<HTMLInputElement>(null);
 
@@ -73,7 +76,7 @@ export function EditCollectionDialog({
           description: description.trim() || null,
           notes: notes.trim() || null,
           tags,
-          isPublic,
+          visibility,
         }),
       });
       if (!res.ok) throw new Error();
@@ -151,10 +154,20 @@ export function EditCollectionDialog({
               </div>
             </div>
 
-            <label className="flex items-center gap-2 text-sm cursor-pointer">
-              <input type="checkbox" checked={isPublic} onChange={(e) => setIsPublic(e.target.checked)} className="rounded" />
-              {t("makePublic")}
-            </label>
+            <div className="space-y-2">
+              <Label htmlFor="edit-col-visibility">{tRecipe("visibilityMenuLabel")}</Label>
+              <select
+                id="edit-col-visibility"
+                value={visibility}
+                onChange={(e) => setVisibility(e.target.value as Visibility)}
+                className="flex h-9 w-full rounded-md border border-input bg-transparent px-3 py-1 text-sm shadow-xs"
+              >
+                <option value="private">{tRecipe("visibility.private")}</option>
+                <option value="followers">{tRecipe("visibility.followers")}</option>
+                <option value="unlisted">{tRecipe("visibility.unlisted")}</option>
+                <option value="public">{tRecipe("visibility.public")}</option>
+              </select>
+            </div>
           </div>
 
           <DialogFooter>