Add expo-keyboard-language native module

New Expo module that exposes keyboard language detection via a node
handle. On iOS it resolves the React Native view tag to the underlying
UITextField/UITextView and returns textInputMode.primaryLanguage (BCP 47
tag). Android and web return null for now.

https://claude.ai/code/session_01AMCp4M56WtFPz1pZtwgcvx

modules/expo-keyboard-language/android/build.gradle

@@ -0,0 +1,39 @@
+apply plugin: 'com.android.library'
+
+group = 'expo.modules.keyboardlanguage'
+version = '1.0.0'
+
+def expoModulesCorePlugin = new File(project(":expo-modules-core").projectDir.absolutePath, "ExpoModulesCorePlugin.gradle")
+apply from: expoModulesCorePlugin
+applyKotlinExpoModulesCorePlugin()
+useCoreDependencies()
+useExpoPublishing()
+
+def useManagedAndroidSdkVersions = false
+if (useManagedAndroidSdkVersions) {
+  useDefaultAndroidSdkVersions()
+} else {
+  buildscript {
+    ext.safeExtGet = { prop, fallback ->
+      rootProject.ext.has(prop) ? rootProject.ext.get(prop) : fallback
+    }
+  }
+  project.android {
+    compileSdkVersion safeExtGet("compileSdkVersion", 34)
+    defaultConfig {
+      minSdkVersion safeExtGet("minSdkVersion", 21)
+      targetSdkVersion safeExtGet("targetSdkVersion", 34)
+    }
+  }
+}
+
+android {
+  namespace "expo.modules.keyboardlanguage"
+  defaultConfig {
+    versionCode 1
+    versionName "1.0.0"
+  }
+  lintOptions {
+    abortOnError false
+  }
+}

modules/expo-keyboard-language/android/src/main/AndroidManifest.xml

@@ -0,0 +1 @@
+<manifest/>

modules/expo-keyboard-language/android/src/main/java/expo/modules/keyboardlanguage/ExpoKeyboardLanguageModule.kt

@@ -0,0 +1,15 @@
+package expo.modules.keyboardlanguage
+
+import expo.modules.kotlin.modules.Module
+import expo.modules.kotlin.modules.ModuleDefinition
+
+class ExpoKeyboardLanguageModule : Module() {
+  override fun definition() =
+    ModuleDefinition {
+      Name("ExpoKeyboardLanguage")
+
+      Function("getKeyboardLanguage") { _: Int ->
+        return@Function null as String?
+      }
+    }
+}