fix(mobile-next): 按 B-91 收口 Android 通话视觉打回项

呼出/通话中按钮、计时器、底色、60s 未接与进出场动效对齐视觉规范。

Co-authored-by: Cursor <cursoragent@cursor.com>
Co-authored-by: multica-agent <github@multica.ai>

mobile-next/lib/company/brand/app_tokens.dart

@@ -24,6 +24,9 @@ class AppColors {
   static const Color maskBg = Color(0xFF000000);
   static const Color success = Color(0xFF00B42A);
   static const Color warning = Color(0xFFFF7D00);
+
+  /// 通话页纯色深底。与 [textPrimary] 同值（`#1D2129`），不得改用 [maskBg]。
+  static const Color callBg = textPrimary;
 }
 
 class AppFont {
@@ -33,6 +36,9 @@ class AppFont {
   static const double sub = 14;
   static const double body = 16;
   static const double title = 18;
+
+  /// 语音通话计时器，B-91 §2 唯一字号例外。
+  static const double callTimer = 32;
 }
 
 class AppGap {
@@ -45,6 +51,9 @@ class AppGap {
   static const double x6 = 24;
   static const double x8 = 32;
   static const double x12 = 48;
+
+  /// 来电拒绝/接听间距，B-91 §4.10。
+  static const double x24 = 96;
 }
 
 class AppRadius {
@@ -66,6 +75,18 @@ class AppIconSize {
   static const double lg = 24;
 }
 
+/// 安卓语音通话页尺寸，取值只来自 B-91 §4.10。
+class AppCallSize {
+  AppCallSize._();
+
+  static const double nameTop = 96;
+  static const double avatar = 96;
+  static const double primaryBtn = 64;
+  static const double secondaryBtn = 48;
+  static const double incomingGap = AppGap.x24;
+  static const double minimizeHit = 48;
+}
+
 class AppDuration {
   AppDuration._();
 
@@ -77,6 +98,10 @@ class AppDuration {
   static const toastStay = Duration(seconds: 2);
   static const bannerCollapse = Duration(milliseconds: 300);
   static const picture = Duration(milliseconds: 200);
+  static const callPage = Duration(milliseconds: 250);
+  static const callEndHold = Duration(milliseconds: 1500);
+  static const callInviteTimeout = Duration(seconds: 60);
+  static const callVibrate = Duration(seconds: 1);
 }
 
 class AppMotion {