Read scope opacity for share links from the mask, as feather is

The share state took the opacity the slider last showed, which a
show-only update can leave apart from the mask; it now reads the mask
itself, as the feather does. The test reset also restores full opacity.

Co-authored-by: Manjunath Paparaju <[email protected]>

src/scopeMask.js

@@ -591,6 +591,7 @@ export function _resetScopeMaskForTest() {
   _viewer = null;
   _enabled = true;
   _featherRatio = SCOPE_FEATHER_RATIO_DEFAULT;
+  _maskOpacity = 1;
   _terminusAlpha = SCOPE_OUTSIDE_ALPHA;
   _terminusOverride = null;
   _terminusRepaints = 0;

src/ui/applicationShell.js

@@ -226,6 +226,7 @@ export class StyleManager extends ShellFacade {
         getDetectionTuning: services.getDetectionTuning,
         getKeyholeFadeTuning: services.getKeyholeFadeTuning,
         getScopeMaskFeather: services.getScopeMaskFeather,
+        getScopeMaskOpacity: services.getScopeMaskOpacity,
         getScopeTerminusOverride: services.getScopeTerminusOverride,
         governorRequestRender: services.governorRequestRender,
         holdContinuousRender: services.holdContinuousRender,

src/ui/visualSettings.js

@@ -225,6 +225,7 @@ export class VisualSettings {
     // What the Scope and Celestial controls show; null until first set.
     this._scopeEnabledShown = null;
     this._scopeFeatherShown = null;
+    this._scopeOpacityShown = null;
     this._celestialShown = null;
     this.activeStyle = 'normal';
     this._preCyberStyle = null;
@@ -895,6 +896,7 @@ export class VisualSettings {
       getDetectionTuning,
       isScopeMaskEnabled,
       getScopeMaskFeather,
+      getScopeMaskOpacity,
       getScopeTerminusOverride,
     } = this.services;
     const detection = this._shareableDetectionState();
@@ -915,7 +917,7 @@ export class VisualSettings {
         celestialRingEnabled: this.celestialRingEnabled,
         scopeEnabled: isScopeMaskEnabled(),
         scopeFeatherPct: Math.round(getScopeMaskFeather() * 100),
-        scopeOpacityPct: this._scopeOpacityShown ?? 100,
+        scopeOpacityPct: Math.round((getScopeMaskOpacity?.() ?? 1) * 100),
         // null when adaptive — the share layer omits `sce` entirely in that case.
         scopeTerminusPct:
           getScopeTerminusOverride() == null