Justify the tracker toolbar rows edge to edge (v0.3.2)

Each transport-toolbar row now distributes its elements across the full width
(Arrangement.SpaceBetween) instead of clustering at the left: dropped the
per-row horizontalScroll (which gave the row infinite width and defeated any
distribution) and the manual landscape spacer. Rows no longer scroll — elements
fill the bar edge to edge. Patch bump to 0.3.2 (versionCode 5).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

app/build.gradle.kts

@@ -22,8 +22,8 @@ android {
         // (android.media.midi) and AAudio low-latency audio we rely on.
         minSdk = 26
         targetSdk = 34
-        versionCode = 4
-        versionName = "0.3.1"
+        versionCode = 5
+        versionName = "0.3.2"
 
         // We provide our own instrumentation runner if/when tests are added.
         testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"