feat: iOS Safari install instructions (v0.65.1)

beforeinstallprompt is Chromium-only by spec -- Safari (iOS and
macOS) never fires it and has no programmatic install API at all, so
the existing install banner silently did nothing there. Detects iOS
Safari specifically and shows a static "tap Share, then Add to Home
Screen" banner instead, dismissible and tracked separately from the
Chromium banner's own dismissal state. No-ops once already installed
(display-mode: standalone / navigator.standalone).

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

package.json

@@ -1,6 +1,6 @@
 {
   "name": "epicure",
-  "version": "0.65.0",
+  "version": "0.65.1",
   "private": true,
   "scripts": {
     "dev": "pnpm --filter web dev",