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/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@epicure/web",
-  "version": "0.66.0",
+  "version": "0.67.0",
   "private": true,
   "scripts": {
     "dev": "next dev",