Add endoscopy result viewer screen

New screen for viewing endoscopy results: 2×2 snapshot grid with
simulated endoscopic view (radial gradient + specular highlight),
diagnosis chips, conclusion, numbered recommendations, PDF/share
actions, and full-screen image viewer with pagination.

Wired via nav route `result:<id>` from ResultsScreen and exposed in
Tweaks screen selector.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/PhoneApp.jsx

@@ -8,7 +8,7 @@ import {
 } from './screens/screens-booking.jsx';
 import {
   ApptsTabScreen, ApptDetailScreen,
-  ResultsScreen, ResultAudioScreen,
+  ResultsScreen, ResultAudioScreen, ResultEndoscopyScreen,
   RecoveryScreen, AudioTestScreen,
   ChatTabScreen, ProfileTabScreen, QRScreen,
   TelemedScreen, MedcardScreen, NotificationsScreen,
@@ -31,6 +31,7 @@ function renderScreen(screenId, nav, ctx) {
     case 'appt':            return <ApptDetailScreen nav={nav} apptId={parts[1]} />;
     case 'results':         return <ResultsScreen nav={nav} />;
     case 'result-audio':    return <ResultAudioScreen nav={nav} />;
+    case 'result':          return <ResultEndoscopyScreen nav={nav} resultId={parts[1]} />;
     case 'recovery':        return <RecoveryScreen nav={nav} />;
     case 'audiotest':       return <AudioTestScreen nav={nav} />;
     case 'chat':            return <ChatTabScreen nav={nav} />;