Align version catalog aliases with a shared convention

Renames version aliases so that each dependency has one canonical name,
matching the other Kotlin Multiplatform sample repositories. This makes
versions directly comparable across samples instead of hiding behind
several spellings of the same dependency.

The convention:

- One alias per independently-released dependency train, named after the
  train rather than after one artifact in it.
- Lowercase kebab-case, with one exception: the android-compileSdk,
  android-minSdk and android-targetSdk trio, which build scripts read as
  libs.versions.android.compileSdk.
- The prefix says who ships it. compose-* for JetBrains multiplatform
  artifacts (org.jetbrains.compose.*, org.jetbrains.androidx.*),
  androidx-* for Google's Android-only ones. Several samples use both at
  once, so the distinction has to be visible in the name.

The [versions] block is also sorted alphabetically.

No resolved dependency version changes: every rename keeps its value, and
aliases merged together already held identical versions.

Author: zsmb13

gradle/libs.versions.toml

@@ -1,14 +1,14 @@
 [versions]
 agp = "9.0.1"
-kotlin = "2.3.10"
-android-minSdk = "24"
 android-compileSdk = "36"
-vanniktechMavenPublish = "0.36.0"
+android-minSdk = "24"
+kotlin = "2.3.10"
+vanniktech-maven-publish = "0.36.0"
 
 [libraries]
 kotlin-test = { module = "org.jetbrains.kotlin:kotlin-test", version.ref = "kotlin" }
 
 [plugins]
 android-kotlin-multiplatform-library = { id = "com.android.kotlin.multiplatform.library", version.ref = "agp" }
 kotlinMultiplatform = { id = "org.jetbrains.kotlin.multiplatform", version.ref = "kotlin" }
-vanniktech-mavenPublish = { id = "com.vanniktech.maven.publish", version.ref = "vanniktechMavenPublish" }
+vanniktech-mavenPublish = { id = "com.vanniktech.maven.publish", version.ref = "vanniktech-maven-publish" }