Introduce unified design tokens and migrate Home, Orders, and Statistics UI.

Establish AppColor/AppFont/AppSpacing/AppRadius theming, shared components, and design-system docs so pilot screens align with Android while keeping iOS-native spacing and touch targets.

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

suixinkanTests/AppThemeTokensTests.swift

@@ -0,0 +1,80 @@
+//
+//  AppThemeTokensTests.swift
+//  suixinkanTests
+//
+
+import UIKit
+import XCTest
+@testable import suixinkan
+
+/// Design Token 值与 Android 对齐校验。
+final class AppThemeTokensTests: XCTestCase {
+
+    func testPrimaryColorMatchesAndroid() {
+        XCTAssertEqual(AppColor.primary.hexRGB, 0x0073FF)
+    }
+
+    func testPageBackgroundColors() {
+        XCTAssertEqual(AppColor.pageBackground.hexRGB, 0xF5F5F5)
+        XCTAssertEqual(AppColor.pageBackgroundSoft.hexRGB, 0xF7FAFF)
+    }
+
+    func testTextColorsMatchAndroid() {
+        XCTAssertEqual(AppColor.textPrimary.hexRGB, 0x333333)
+        XCTAssertEqual(AppColor.textSecondary.hexRGB, 0x666666)
+        XCTAssertEqual(AppColor.textTertiary.hexRGB, 0x999999)
+    }
+
+    func testSemanticStatusColors() {
+        XCTAssertEqual(AppColor.success.hexRGB, 0x10B981)
+        XCTAssertEqual(AppColor.danger.hexRGB, 0xEF4444)
+        XCTAssertEqual(AppColor.warning.hexRGB, 0xFF7B00)
+        XCTAssertEqual(AppColor.info.hexRGB, 0x0073FF)
+    }
+
+    func testSpacingGrid() {
+        XCTAssertEqual(AppSpacing.xxs, 4)
+        XCTAssertEqual(AppSpacing.xs, 8)
+        XCTAssertEqual(AppSpacing.sm, 12)
+        XCTAssertEqual(AppSpacing.md, 16)
+        XCTAssertEqual(AppSpacing.lg, 24)
+        XCTAssertEqual(AppSpacing.screenHorizontalInset, AppSpacing.md)
+        XCTAssertEqual(AppSpacing.minTouchTarget, 44)
+        XCTAssertGreaterThanOrEqual(AppSpacing.buttonHeight, AppSpacing.minTouchTarget)
+    }
+
+    func testRadiusTokens() {
+        XCTAssertEqual(AppRadius.xs, 4)
+        XCTAssertEqual(AppRadius.md, 10)
+        XCTAssertEqual(AppRadius.lg, 12)
+        XCTAssertEqual(AppRadius.xl, 16)
+    }
+
+    func testAppFontSizes() {
+        XCTAssertEqual(UIFont.app(.body).pointSize, 14)
+        XCTAssertEqual(UIFont.app(.metric).pointSize, 18)
+        XCTAssertEqual(UIFont.app(.display).pointSize, 28)
+    }
+
+    func testStatusBadgeOrderMapping() {
+        let badge = AppStatusBadge()
+        badge.applyOrderStatus(30, text: "已完成")
+        // 布局完成后仍应能读取子 label 文案
+        XCTAssertFalse(badge.isHidden)
+    }
+}
+
+private extension UIColor {
+
+    var hexRGB: UInt {
+        var red: CGFloat = 0
+        var green: CGFloat = 0
+        var blue: CGFloat = 0
+        var alpha: CGFloat = 0
+        getRed(&red, green: &green, blue: &blue, alpha: &alpha)
+        let r = Int(round(red * 255))
+        let g = Int(round(green * 255))
+        let b = Int(round(blue * 255))
+        return UInt(r << 16 | g << 8 | b)
+    }
+}