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>

apps/web/lib/changelog.ts

@@ -1,5 +1,5 @@
 // Mirrors CHANGELOG.md at the repo root — update both together.
-export const APP_VERSION = "0.65.0";
+export const APP_VERSION = "0.65.1";
 
 export type ChangelogEntry = {
   version: string;
@@ -11,6 +11,13 @@ export type ChangelogEntry = {
 };
 
 export const CHANGELOG: ChangelogEntry[] = [
+  {
+    version: "0.65.1",
+    date: "2026-07-21 01:00",
+    added: [
+      "The install banner now shows an iOS Safari-specific instructional variant (\"Tap Share, then Add to Home Screen\") instead of silently doing nothing — Safari never fires the event the regular Install button depends on, so it had no install guidance at all before this.",
+    ],
+  },
   {
     version: "0.65.0",
     date: "2026-07-21 00:45",