merge: bring gallery frontend branch up to date with goutamnextflow

goutamnextflow adopts @insignia/iios-messaging-ui (drops the bespoke
messenger/inbox/mail) and adds Org Settings → Integrations. Resolve against
the Smart Gallery work:
- dashboard.tsx: route messenger→MessengerSdk, inbox→InboxSdk, add settings→
  Settings (goutamnextflow) AND keep gallery→SmartGallery (ours). Drop the
  now-deleted Messenger/Inbox imports.
- next.config.ts / package.json: union transpilePackages + deps (keep
  @photo-gallery/sdk + ML deps AND @insignia/iios-messaging-ui).
- dashboard.css: keep both appended blocks (.gal* gallery + .settings-* org
  settings).

Gallery integrates with zero errors. Vendored @photo-gallery/sdk re-synced
(0-diff). Verified: tsc clean + `next build` compiles the whole merged app
(gallery AI routes + dashboard). The new @insignia/iios-messaging-ui private
dep is stubbed locally (see .claude/dev-scripts); it resolves on CI/Vercel.

src/components/dashboard/dashboard.tsx

@@ -15,8 +15,9 @@ import { Support } from "./support";
 import { Rules } from "./rules";
 import { AiAssistant } from "./ai-assistant";
 import { TeamManagement } from "./team-management";
-import { Messenger } from "./messenger";
-import { Inbox } from "./inbox";
+import { MessengerSdk } from "./messenger-sdk";
+import { InboxSdk } from "./inbox-sdk";
+import { Settings } from "./settings";
 import { SmartGallery } from "./smart-gallery";
 import "../../app/dashboard/dashboard.css";
 
@@ -48,8 +49,9 @@ export function Dashboard() {
               : active === "support" ? <Support />
               : active === "rules" ? <Rules />
               : active === "ai" ? <AiAssistant />
-              : active === "messenger" ? <Messenger />
-              : active === "inbox" ? <Inbox />
+              : active === "messenger" ? <MessengerSdk />
+              : active === "inbox" ? <InboxSdk />
+              : active === "settings" ? <Settings />
               : active === "gallery" ? <SmartGallery theme={theme} />
               : active === "team" ? <TeamManagement />
               : <ComingSoon title={title} icon={item?.icon ?? "dashboard"} onGo={setActive} />}