feat(features): improve responsiveness and empty states across feature views

Use adaptive grid columns and atlasContentWidth for responsive layouts
in Overview, Apps, History, and SmartClean views. Add action buttons
to empty states. Use flexible height for Apps split view. Refine
SmartClean scan/plan UI with brand-tinted progress and status chips.

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

Packages/AtlasFeaturesApps/Sources/AtlasFeaturesApps/AppsFeatureView.swift

@@ -130,7 +130,7 @@ public struct AppsFeatureView: View {
                     }
                     .frame(maxWidth: .infinity, maxHeight: .infinity, alignment: .topLeading)
                 }
-                .frame(height: 560)
+                .frame(minHeight: 400, maxHeight: .infinity)
             }
         }
         .onAppear(perform: syncSelection)
@@ -186,7 +186,9 @@ public struct AppsFeatureView: View {
                     title: AtlasL10n.string("apps.list.empty.title"),
                     detail: AtlasL10n.string("apps.list.empty.detail"),
                     systemImage: "square.stack.3d.up.slash",
-                    tone: .neutral
+                    tone: .neutral,
+                    actionTitle: AtlasL10n.string("emptystate.action.refresh"),
+                    onAction: onRefreshApps
                 )
             } else {
                 List(selection: $selectedAppID) {
@@ -351,6 +353,8 @@ private struct AppDetailView: View {
     let onPreview: () -> Void
     let onUninstall: () -> Void
 
+    @State private var showUninstallConfirmation = false
+
     var body: some View {
         VStack(alignment: .leading, spacing: AtlasSpacing.xl) {
             HStack(alignment: .top, spacing: AtlasSpacing.lg) {
@@ -442,7 +446,7 @@ private struct AppDetailView: View {
                                 title: item.title,
                                 subtitle: item.detail,
                                 footnote: item.recoverable ? AtlasL10n.string("apps.preview.row.recoverable") : AtlasL10n.string("apps.preview.row.review"),
-                                systemImage: icon(for: item.kind),
+                                systemImage: item.kind.atlasSystemImage,
                                 tone: item.recoverable ? .success : .warning
                             ) {
                                 AtlasStatusChip(
@@ -491,26 +495,26 @@ private struct AppDetailView: View {
 
     private var uninstallButton: some View {
         Button(isUninstalling ? AtlasL10n.string("apps.uninstall.running") : AtlasL10n.string("apps.uninstall.action")) {
-            onUninstall()
+            showUninstallConfirmation = true
         }
         .buttonStyle(.atlasPrimary)
         .disabled(isBusy || previewPlan == nil)
         .accessibilityIdentifier("apps.uninstall.\(app.id.uuidString)")
         .accessibilityHint(AtlasL10n.string("apps.uninstall.hint"))
-    }
-
-    private func icon(for kind: ActionItem.Kind) -> String {
-        switch kind {
-        case .removeCache:
-            return "trash"
-        case .removeApp:
-            return "app.badge.minus"
-        case .archiveFile:
-            return "archivebox"
-        case .inspectPermission:
-            return "lock.shield"
+        .confirmationDialog(
+            AtlasL10n.string("apps.confirm.uninstall.title"),
+            isPresented: $showUninstallConfirmation,
+            titleVisibility: .visible
+        ) {
+            Button(AtlasL10n.string("apps.uninstall.action"), role: .destructive) {
+                onUninstall()
+            }
+            Button(AtlasL10n.string("confirm.cancel"), role: .cancel) {}
+        } message: {
+            Text(AtlasL10n.string("apps.confirm.uninstall.message", app.name))
         }
     }
+
 }
 
 private struct AppGroup: Identifiable {