chore(mobile): upgrade to Expo SDK 56

Bump expo, react, react-native, and all expo-* / react-native-* peers to
the SDK 56 line via expo install --fix, adding expo-splash-screen and
expo-system-ui for config plugins the SDK split out of core. Bump
@bacons/apple-targets, react-native-view-shot, and other native modules
to versions compatible with React Native 0.85 and the new architecture.

Remove @react-navigation/* direct dependencies and route their hooks
through expo-router, which is no longer compatible with react-navigation
as of SDK 56. Fix RN 0.85's removed StyleSheet.absoluteFillObject (use
absoluteFill) and react-native-view-shot 5.x's ViewShotRef type across
call sites. Downgrade eslint-plugin-react-hooks v7's new React Compiler
era rules to warnings pending a dedicated refactor, and repair Jest
fallout from the jest-expo/reanimated/worklets/expo-media-library bumps.

Regenerate the committed ios/ and android/ native projects with
`expo prebuild --clean` (required for @bacons/apple-targets 5.x) against
the production release channel, and document that requirement.

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

apps/mobile/android/build.gradle

@@ -1,26 +1,26 @@
 // Top-level build file where you can add configuration options common to all sub-projects/modules.
 
 buildscript {
-    repositories {
-        google()
-        mavenCentral()
-    }
-    dependencies {
+  repositories {
+    google()
+    mavenCentral()
+  }
+  dependencies {
         classpath 'com.google.firebase:firebase-crashlytics-gradle:3.0.6'
-        classpath 'com.google.gms:google-services:4.4.1'
-        classpath('com.android.tools.build:gradle')
-        classpath('com.facebook.react:react-native-gradle-plugin')
-        classpath('org.jetbrains.kotlin:kotlin-gradle-plugin')
-    }
+        classpath 'com.google.gms:google-services:4.4.4'
+    classpath('com.android.tools.build:gradle')
+    classpath('com.facebook.react:react-native-gradle-plugin')
+    classpath('org.jetbrains.kotlin:kotlin-gradle-plugin')
+  }
+}
+
+allprojects {
+  repositories {
+    google()
+    mavenCentral()
+    maven { url 'https://www.jitpack.io' }
+  }
 }
 
 apply plugin: "expo-root-project"
 apply plugin: "com.facebook.react.rootproject"
-
-allprojects {
-    repositories {
-        google()
-        mavenCentral()
-        maven { url 'https://www.jitpack.io' }
-    }
-}