Add proper icons for marketplace

doc/marketplace-scripts/circle-grid/metadata.json

@@ -1,4 +0,0 @@
-{
-  "name": "Circle grid",
-  "description": "Concentric circles and calibration marks to test geometry and focus."
-}

doc/marketplace-scripts/circle-grid/source.js

@@ -1,42 +0,0 @@
-function init() {}
-
-function tick(context, state) {
-    const { ctx, width, height, deltaMs } = context;
-    if (!ctx) {
-        return;
-    }
-    ctx.clearRect(0, 0, width, height);
-
-    const centerX = width / 2;
-    const centerY = height / 2;
-    const maxRadius = Math.min(width, height) * 0.45;
-    const pulse = 0.02 * (deltaMs || 0);
-    state.phase = (state.phase || 0) + pulse;
-
-    ctx.strokeStyle = "#38bdf8";
-    ctx.lineWidth = 2;
-    for (let radius = maxRadius; radius > 0; radius -= maxRadius / 6) {
-        ctx.globalAlpha = 0.2 + (radius / maxRadius) * 0.6;
-        ctx.beginPath();
-        ctx.arc(centerX, centerY, radius, 0, Math.PI * 2);
-        ctx.stroke();
-    }
-    ctx.globalAlpha = 1;
-
-    ctx.strokeStyle = "#22c55e";
-    ctx.lineWidth = 3;
-    const sweep = (Math.sin(state.phase) + 1) / 2;
-    const sweepRadius = maxRadius * (0.3 + sweep * 0.7);
-    ctx.beginPath();
-    ctx.arc(centerX, centerY, sweepRadius, 0, Math.PI * 2);
-    ctx.stroke();
-
-    ctx.strokeStyle = "#f8fafc";
-    ctx.lineWidth = 1;
-    ctx.beginPath();
-    ctx.moveTo(centerX, 0);
-    ctx.lineTo(centerX, height);
-    ctx.moveTo(0, centerY);
-    ctx.lineTo(width, centerY);
-    ctx.stroke();
-}