feat(ios): refine native interface and app icon

Unify bottom actions, selection controls, navigation structure, spacing, and theme colors across iOS pages. Replace the app icon with a higher-contrast native-style asset and include its source SVG.

apps/ios/Sources/MultiSimAdmin/Features/Settings/SettingsView.swift

@@ -9,24 +9,23 @@ struct SettingsView: View {
     }
 
     var body: some View {
-        ZStack {
-            AITheme.canvas.ignoresSafeArea()
-            ScrollView {
-                LazyVStack(spacing: 12) {
-                    if let errorMessage = model.errorMessage {
-                        AIStatusBanner(errorMessage, tint: AITheme.danger, systemImage: "exclamationmark.triangle")
-                    }
-                    if let notice = model.notice {
-                        AIStatusBanner(notice, tint: AITheme.success, systemImage: "checkmark.circle")
-                    }
-
-                    runtimeCard
-                    storageCard
-                    securityCard
+        ScrollView {
+            LazyVStack(spacing: 12) {
+                if let errorMessage = model.errorMessage {
+                    AIStatusBanner(errorMessage, tint: AITheme.danger, systemImage: "exclamationmark.triangle")
                 }
-                .padding(16)
+                if let notice = model.notice {
+                    AIStatusBanner(notice, tint: AITheme.success, systemImage: "checkmark.circle")
+                }
+
+                runtimeCard
+                storageCard
+                securityCard
             }
+            .padding(16)
+            .padding(.bottom, 8)
         }
+        .background(AITheme.canvas.ignoresSafeArea())
         .navigationTitle("设置")
         .toolbar {
             ToolbarItemGroup(placement: .primaryAction) {
@@ -81,7 +80,7 @@ struct SettingsView: View {
                 } label: {
                     Label("清除运行日志", systemImage: "trash")
                 }
-                .buttonStyle(AIButtonStyle(kind: .danger, size: .large, fillsWidth: true))
+                    .buttonStyle(AIButtonStyle(kind: .danger, size: .regular, fillsWidth: true))
             }
         }
     }