Add Tape Engine and Granular Glitch visual effects (v0.13.0)

Tape Engine: a varispeed reel-to-reel. Audio runs through a ring buffer read at a
glided 'speed'; the editor draws two spinning reels you press-and-hold to brake,
diving the pitch like a finger on a slowing tape. Wow (slow, tempo-synced via
division) and flutter (fast) wobble the rate; hiss adds tape noise.

Granular Glitch: records the signal and, driven by Intensity, jumps the read head
back to replay short grains (stutter/repeat/octave glitch). A new VizEffect
interface lets the processor publish a decimated scope + playhead; the engine
exposes it per slot (effectScope/effectPlayhead), and the editor draws a dotted
oscilloscope with the jumping playhead over it plus a horizontal Intensity slider.
The scope reads in the Canvas draw phase (redraw only, no recomposition), mirroring
the VU-meter path.

Also make the toolbox device picker scrollable so all types stay reachable.

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 = 32
-        versionName = "0.12.1"
+        versionCode = 33
+        versionName = "0.13.0"
 
         // We provide our own instrumentation runner if/when tests are added.
         testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"