fix: consolidate model switch cases, brand-tint controls, fix avatar asset

Merge settings/about cases in refreshCurrentRoute. Refactor TaskCenterView
to use domain-level icon/tone helpers and atlasPrimary button style.
Brand-tint toggle and stepper in SettingsFeatureView. Remove redundant
scale from avatar image asset.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Apps/AtlasApp/Sources/AtlasApp/AtlasAppModel.swift

@@ -480,9 +480,7 @@ final class AtlasAppModel: ObservableObject {
             break
         case .permissions:
             await inspectPermissions()
-        case .settings:
+        case .settings, .about:
-            break
-        case .about:
             break
         }
     }

Apps/AtlasApp/Sources/AtlasApp/TaskCenterView.swift

@@ -43,10 +43,10 @@ struct TaskCenterView: View {
                             title: taskRun.kind.title,
                             subtitle: taskRun.summary,
                             footnote: timelineFootnote(for: taskRun),
-                            systemImage: icon(for: taskRun.kind),
+                            systemImage: taskRun.kind.atlasSystemImage,
-                            tone: taskRun.status.tintTone
+                            tone: taskRun.status.atlasTone
                         ) {
-                            AtlasStatusChip(taskRun.status.title, tone: taskRun.status.tintTone)
+                            AtlasStatusChip(taskRun.status.title, tone: taskRun.status.atlasTone)
                         }
                     }
                 }
@@ -55,8 +55,7 @@ struct TaskCenterView: View {
             Button(action: onOpenHistory) {
                 Label(AtlasL10n.string("taskcenter.openHistory"), systemImage: "arrow.right.circle.fill")
             }
-            .buttonStyle(.borderedProminent)
+            .buttonStyle(.atlasPrimary)
-            .controlSize(.large)
             .keyboardShortcut(.defaultAction)
             .accessibilityIdentifier("taskcenter.openHistory")
             .accessibilityHint(AtlasL10n.string("taskcenter.openHistory.hint"))
@@ -74,33 +73,4 @@ struct TaskCenterView: View {
         return AtlasL10n.string("taskcenter.timeline.running", start)
     }
 
-    private func icon(for kind: TaskKind) -> String {
-        switch kind {
-        case .scan:
-            return "sparkles"
-        case .executePlan:
-            return "play.circle"
-        case .uninstallApp:
-            return "trash"
-        case .restore:
-            return "arrow.uturn.backward.circle"
-        case .inspectPermissions:
-            return "lock.shield"
-        }
-    }
-}
-
-private extension TaskStatus {
-    var tintTone: AtlasTone {
-        switch self {
-        case .queued:
-            return .neutral
-        case .running:
-            return .warning
-        case .completed:
-            return .success
-        case .failed, .cancelled:
-            return .danger
-        }
-    }
 }

Packages/AtlasFeaturesAbout/Sources/AtlasFeaturesAbout/Resources/Media.xcassets/avatar.imageset/Contents.json

@@ -2,8 +2,7 @@
   "images" : [
     {
       "filename" : "avatar.png",
-      "idiom" : "universal",
+      "idiom" : "universal"
-      "scale" : "2x"
     }
   ],
   "info" : {

Packages/AtlasFeaturesSettings/Sources/AtlasFeaturesSettings/SettingsFeatureView.swift

@@ -129,6 +129,7 @@ public struct SettingsFeatureView: View {
                         .font(AtlasTypography.body.weight(.medium))
                 }
                 .toggleStyle(.switch)
+                .tint(AtlasColor.brand)
                 .accessibilityIdentifier("settings.notifications")
                 .accessibilityHint(AtlasL10n.string("settings.notifications.hint"))
             }
@@ -162,6 +163,7 @@ public struct SettingsFeatureView: View {
                     Text(AtlasL10n.string("settings.retention.adjust"))
                         .font(AtlasTypography.body.weight(.medium))
                 }
+                .tint(AtlasColor.brand)
                 .accessibilityIdentifier("settings.recoveryRetention")
                 .accessibilityHint(AtlasL10n.string("settings.retention.hint"))
             }