Widen arrangement mute toggles and block headers ~1.5× (v0.12.1)

Bigger, easier thumb targets on the arrangement roll's left column: the mute
toggle 34→51 dp and the block-number header 34→51 dp (laneColWidth 68→102). The
scrollable ruler/roll to the right is unaffected.

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 = 31
-        versionName = "0.12.0"
+        versionCode = 32
+        versionName = "0.12.1"
 
         // We provide our own instrumentation runner if/when tests are added.
         testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"

app/src/main/java/space/rcmd/android/sizzle/ui/tracker/ArrangementRoll.kt

@@ -94,8 +94,8 @@ fun ArrangementRoll(vm: AppViewModel) {
     val glyphs = remember(measurer) { GlyphCache(measurer) }
 
     val beatWidth = 20.dp
-    val muteColWidth = 34.dp // wide enough to hit comfortably from the screen edge
-    val laneColWidth = 68.dp // mute toggle + block number
+    val muteColWidth = 51.dp // ~1.5× — wider, easy to hit from the screen edge
+    val laneColWidth = 102.dp // mute toggle (51) + block number header (51), both ~1.5×
     val rulerHeight = 18.dp
     val beatWidthPx = with(density) { beatWidth.toPx() }
     val rulerHeightPx = with(density) { rulerHeight.toPx() }