fix(manifold): slider fill tracks value; hide noise-cap rings

- mf-slider-input fill used calc(var(--mf-pct)*100%) but three consumers
  (OutputControlRow held slider, OutputEditor, shared-ui Field) never set
  --mf-pct, so the coloured track-fill stayed empty while only the native
  thumb moved. Set --mf-pct inline on all three; harden the base class
  (appearance:none + transparent bg + --mf-pct fallback + moz-range-progress).
- hide the two concentric noise-cap exploration rings around the input dot.

manifold/src/console/Manifold.tsx

@@ -285,22 +285,8 @@ export function Manifold({
         ctx.stroke();
       }
 
-      if (nc > 0.001) {
-        const breathe = 1 + Math.sin(now / 600) * 0.06;
-        const rCap = nc * Math.min(W, H) * 0.5 * breathe;
-        const rCur = rCap * 0.55;
-        ctx.setLineDash([4, 5]);
-        ctx.strokeStyle = 'rgba(255,106,0,0.4)';
-        ctx.lineWidth = 1.5;
-        ctx.beginPath();
-        ctx.arc(px, py, rCap, 0, Math.PI * 2);
-        ctx.stroke();
-        ctx.strokeStyle = 'rgba(255,106,0,0.7)';
-        ctx.beginPath();
-        ctx.arc(px, py, rCur, 0, Math.PI * 2);
-        ctx.stroke();
-        ctx.setLineDash([]);
-      }
+      // Noise-cap exploration rings hidden for now (kept for possible later use).
+      void nc;
 
       ctx.shadowColor = fz ? cyan : accent;
       ctx.shadowBlur = 18;

manifold/src/console/OutputEditor.tsx

@@ -51,7 +51,7 @@ function MiniSlider({
         disabled={disabled}
         onChange={(e) => onChange(parseFloat(e.target.value))}
         className="mf-slider-input"
-        style={{ width: '100%' }}
+        style={{ width: '100%', ['--mf-pct' as string]: `${Math.max(0, Math.min(1, value))}` } as CSSProperties}
       />
     </label>
   );

manifold/src/console/shared-ui.tsx

@@ -163,7 +163,13 @@ export function CompactAxis({
         value={value}
         onChange={(e) => onChange(parseFloat(e.target.value))}
         className="mf-slider-input"
-        style={{ width: 120, ['--mf-axis-accent' as string]: accent } as CSSProperties}
+        style={
+          {
+            width: 120,
+            ['--mf-axis-accent' as string]: accent,
+            ['--mf-pct' as string]: `${Math.max(0, Math.min(1, value))}`,
+          } as CSSProperties
+        }
       />
       <span
         style={{

manifold/src/dock/OutputControlRow.tsx

@@ -8,7 +8,7 @@
  * (ConsoleApp owns it) — never a second data path (dock-spec §3.2, §8).
  */
 import { useRef } from 'react';
-import type { PointerEvent as ReactPointerEvent } from 'react';
+import type { CSSProperties, PointerEvent as ReactPointerEvent } from 'react';
 import type { MFParam, ParamStatus } from '../console/model';
 import { CurvePad } from '../console/CurvePad';
 
@@ -288,7 +288,7 @@ export function OutputControlRow({ param, value, onChange, showCurve = false }:
             value={param.val}
             onChange={(e) => onChange({ val: parseFloat(e.target.value) })}
             className="mf-slider-input"
-            style={{ flex: 1 }}
+            style={{ flex: 1, ['--mf-pct' as string]: `${Math.max(0, Math.min(1, param.val))}` } as CSSProperties}
           />
         </label>
       )}

manifold/src/styles/primitives.css

@@ -13,13 +13,21 @@
  */
 
 /* ---- Slider (.mf-slider-input) ---- */
+/* Base reset so the custom track/thumb styling applies even when a consumer
+   doesn't set these inline (e.g. OutputControlRow's held slider). The colored
+   fill tracks `--mf-pct` (0..1); it falls back to 0 if a consumer forgets it. */
+.mf-slider-input {
+  -webkit-appearance: none;
+  appearance: none;
+  background: transparent;
+}
 .mf-slider-input::-webkit-slider-runnable-track {
   height: 4px;
   border-radius: 999px;
   background: linear-gradient(
     to right,
     var(--accent) 0%,
-    var(--accent) calc(var(--mf-pct) * 100%),
+    var(--accent) calc(var(--mf-pct, 0) * 100%),
     var(--bg-3) 0%
   );
 }
@@ -28,6 +36,11 @@
   border-radius: 999px;
   background: var(--bg-3);
 }
+.mf-slider-input::-moz-range-progress {
+  height: 4px;
+  border-radius: 999px;
+  background: var(--accent);
+}
 .mf-slider-input::-webkit-slider-thumb {
   -webkit-appearance: none;
   appearance: none;