简化全局 Loading 遮罩为纯动画展示

移除 Loading UI 中的可见文案，同时保留 message 字段供内部状态及后续使用。

Co-authored-by: Cursor <cursoragent@cursor.com>

suixinkan/Core/Design/GlobalLoadingCenter.swift

@@ -146,25 +146,16 @@ private struct GlobalLoadingOverlayHost: View {
 
                     VStack(spacing: 14) {
                         loadingAnimation
-
-                        if !state.message.isEmpty {
-                            Text(state.message)
-                                .font(.system(size: 15, weight: .medium))
-                                .foregroundStyle(Color(hex: 0x333333))
-                                .multilineTextAlignment(.center)
-                                .lineLimit(2)
-                                .padding(.horizontal, 8)
-                        }
                     }
-                    .padding(.horizontal, 28)
-                    .padding(.vertical, 24)
+                    .padding(.horizontal, 10)
+                    .padding(.vertical, 10)
                     .background(.white, in: RoundedRectangle(cornerRadius: 18, style: .continuous))
                     .shadow(color: Color.black.opacity(0.12), radius: 24, x: 0, y: 10)
                 }
                 .transition(.opacity)
                 .zIndex(10_000)
                 .accessibilityElement(children: .combine)
-                .accessibilityLabel(state.message.isEmpty ? "加载中" : state.message)
+                .accessibilityLabel("加载中")
             }
         }
         .animation(.easeInOut(duration: 0.2), value: state.isVisible)