refactor(visualizer): remove dead sampleCount field from Datum — shader uses durationSeconds only

DeepDrftPublic/Interop/visualizer/MixVisualizer.ts

@@ -130,8 +130,6 @@ function parseColor(css: string): [number, number, number] {
 interface Datum {
     /** GPU texture holding the loudness samples (R8, 1 row tall), linear-filtered. */
     texture: WebGLTexture;
-    /** Number of loudness samples uploaded — used to map the texel-centre offset. */
-    sampleCount: number;
     /** Total mix duration in seconds — needed to map time <-> texture coordinate. */
     durationSeconds: number;
 }
@@ -591,7 +589,7 @@ export function create(canvas: HTMLCanvasElement): MixVisualizerHandle {
         gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE);
         gl.bindTexture(gl.TEXTURE_2D, null);
 
-        return { texture, sampleCount: samples.length, durationSeconds };
+        return { texture, durationSeconds };
     }
 
     return {