feat(HEL-240): 按确认样图还原桌面登录页左右骨架

把登录门户改回确认稿的品牌行、中下部主标题、底部行情标签和 K 线背景，并让超宽屏按比例展开左栏。

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

frontend/shared/tokens.css

@@ -147,6 +147,24 @@
   --duration-fast: 150ms;
   --duration-normal: 220ms;
   --login-brand-gradient: linear-gradient(165deg, #0c1e4a, #16307c, #2153cc);
+  --login-brand-share: 34%;
+  --login-brand-min: 420px;
+  --login-brand-cap: 560px;
+  --login-brand-wide-share: 29.2%;
+  --login-brand-pad: 36px 40px 24px;
+  --login-brand-mark-size: 44px;
+  --login-brand-name-size: 16px;
+  --login-hero-size: 28px;
+  --login-card-width: 408px;
+  --login-card-pad: 32px;
+  --login-card-title-size: 22px;
+  --login-account-row-min: 72px;
+  --login-account-avatar: 40px;
+  --login-submit-height: 40px;
+  --login-stat-chip-bg: rgba(8, 12, 24, 0.48);
+  --login-candle-up: #e07078;
+  --login-candle-down: #3db88a;
+  --login-trend-line: rgba(244, 247, 255, 0.88);
 
   --font-size-aux: 11.5px;
   --font-size-caption: 12.5px;
@@ -516,6 +534,10 @@
   --warning-line-strong: #66502d;
   --control-shadow: 0 1px 3px rgba(0, 0, 0, .3);
   --login-brand-gradient: linear-gradient(165deg, #080c18, #0e1730, #14224a);
+  --login-stat-chip-bg: rgba(6, 8, 16, 0.58);
+  --login-candle-up: #f06d73;
+  --login-candle-down: #43bc8a;
+  --login-trend-line: rgba(232, 236, 244, 0.9);
   --dialog-backdrop: var(--backdrop);
   --ladder-level-1: #2d2426;
   --ladder-level-2: #2b2822;