feat: OS Share Target for recipe URLs (v0.67.0)

Declares share_target in manifest.ts (action /recipes, GET,
title/text/url params). recipes/page.tsx extracts the shared link --
preferring the url param, falling back to the first http(s) URL
found inside text since senders vary on where they put it -- and
passes it to RecipesHeader as sharedUrl. UrlImportDialog gained
initialUrl/autoImport props so the existing import-from-URL flow
opens pre-filled and fires immediately instead of requiring the user
to paste the link back in.

Chromium/Android only -- Safari has no Share Target API at all,
same restriction already documented for the install-prompt banner.

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

apps/web/components/recipe/url-import-dialog.tsx

@@ -1,6 +1,6 @@
 "use client";
 
-import { useState } from "react";
+import { useEffect, useRef, useState } from "react";
 import { useRouter } from "next/navigation";
 import { useTranslations } from "next-intl";
 import { Link2, Loader2 } from "lucide-react";
@@ -25,15 +25,23 @@ type ImportedRecipe = {
 export function UrlImportDialog({
   open,
   onOpenChange,
+  initialUrl,
+  autoImport,
 }: {
   open: boolean;
   onOpenChange: (open: boolean) => void;
+  /** Prefills (and, with autoImport, triggers) the import — used by the OS
+   * Share Target flow (apps/web/app/(app)/recipes/page.tsx) so sharing a
+   * link into the installed PWA lands here already filled in. */
+  initialUrl?: string;
+  autoImport?: boolean;
 }) {
   const t = useTranslations("recipe");
   const tCommon = useTranslations("common");
   const router = useRouter();
-  const [url, setUrl] = useState("");
+  const [url, setUrl] = useState(initialUrl ?? "");
   const [importing, setImporting] = useState(false);
+  const autoImportFired = useRef(false);
 
   async function handleImport() {
     if (!url.trim()) return;
@@ -77,6 +85,14 @@ export function UrlImportDialog({
     }
   }
 
+  useEffect(() => {
+    if (open && autoImport && initialUrl?.trim() && !autoImportFired.current) {
+      autoImportFired.current = true;
+      void handleImport();
+    }
+    // eslint-disable-next-line react-hooks/exhaustive-deps
+  }, [open, autoImport, initialUrl]);
+
   return (
     <Dialog open={open} onOpenChange={onOpenChange}>
       <DialogContent className="max-w-xl">