Integrate libswipetype as submodule (swipe typing engine)

- Added vendor/libswipetype as git submodule
- Included swipetype-android as Gradle module in settings.gradle.kts
- Added implementation project dependency in build.gradle.kts
- Updated swipetype-android build.gradle to use NDK 27 / SDK 36
- Builds and links successfully via CMake + NDK

Next: wire gesture touch detection, trail rendering, and suggestion integration

.gitmodules

@@ -1,3 +1,6 @@
 [submodule "vendor/cdict"]
 	path = vendor/cdict
 	url = https://github.com/Julow/cdict
+[submodule "vendor/libswipetype"]
+	path = vendor/libswipetype
+	url = https://github.com/libswipetype/libswipetype

build.gradle.kts

@@ -9,6 +9,7 @@ dependencies {
   // Following versions of androidx.window require sdk version 23
   implementation("androidx.window:window-java:1.4.0")
   implementation("androidx.core:core:1.16.0") // Version 1.17.0 available with sdk 36
+  implementation(project(":swipetype-android"))
   testImplementation("junit:junit:4.13.2")
 }
 

settings.gradle.kts

@@ -15,3 +15,6 @@ dependencyResolutionManagement {
 }
 
 rootProject.name = "Unexpected-Keyboard"
+
+include(":swipetype-android")
+project(":swipetype-android").projectDir = File("vendor/libswipetype/swipetype-android")