refactor: introducing ViewModel (#17)

* move to viewModel; use submodule to import miuix

* replace widgets with which implemented in miuix

* update CHANGELOG.md

* fix: coroutine handling

* chore: code formatting

* viewModel for TerminalScreen

* viewModel for FileManagerScreen

* chore: code formatting

* fix for review

* chore: optimize imports

app/build.gradle.kts

@@ -126,6 +126,7 @@ androidComponents {
 dependencies {
     implementation(libs.androidx.core.ktx)
     implementation(libs.androidx.lifecycle.runtime.ktx)
+    implementation(libs.androidx.lifecycle.viewmodel.compose)
     implementation(libs.androidx.activity.compose)
     implementation(libs.androidx.core.pip)
     implementation(platform(libs.androidx.compose.bom))