chore(android): target API 36 with Expo 54

Upgrade the mobile runtime and tracked Android project to compile and target API 36. Align Expo modules, React Native, Node, Gradle, and Android build tooling while preserving the custom widget sources.\n\nAdapt file-system, notification, animation, test, and Metro compatibility for the SDK 54 runtime.

apps/mobile/app.json

@@ -7,7 +7,7 @@
     "icon": "./assets/icon.png",
     "scheme": "app.sauci",
     "userInterfaceStyle": "automatic",
-    "newArchEnabled": false,
+    "newArchEnabled": true,
     "splash": {
       "image": "./assets/splash-icon.png",
       "resizeMode": "contain",
@@ -35,7 +35,7 @@
         "NSPhotoLibraryAddUsageDescription": "Sauci saves photos and videos from your partner's messages to your photo library when you tap the save button.",
         "NSMicrophoneUsageDescription": "Sauci uses your microphone to record audio when you capture videos to share privately with your partner."
       },
-      "privacyManifest": {
+      "privacyManifests": {
         "NSPrivacyTracking": false,
         "NSPrivacyCollectedDataTypes": [
           {
@@ -205,8 +205,9 @@
         "expo-build-properties",
         {
           "android": {
-            "targetSdkVersion": 35,
-            "kotlinVersion": "1.9.25",
+            "buildToolsVersion": "36.0.0",
+            "compileSdkVersion": 36,
+            "targetSdkVersion": 36,
             "extraProguardRules": "-keep class com.facebook.hermes.unicode.** { *; }",
             "useLegacyPackaging": false,
             "manifestPlaceholders": {