feat: 更新主题配置与系统设置

frontend-web/src/components/page-sdebar.css

@@ -607,6 +607,27 @@ html.lightyellow .light-topnav-item--active::after {
 }
 
 /* ── 侧边栏：二级图标卡片列（96px）+ 右侧三级列（展开时整体变宽，带过渡）──────── */
+/* Runtime themes use their configurable header gradient rather than the
+   red/blue banner artwork. Navigation copy follows an automatically chosen
+   contrasting foreground so both pale and deep brand colours remain legible. */
+html[data-custom-theme="true"] .light-topnav-item,
+html[data-custom-theme="true"] .top-submenu-item {
+    color: var(--navigation-foreground);
+}
+
+html[data-custom-theme="true"] .light-topnav-item:hover,
+html[data-custom-theme="true"] .light-topnav-item--active,
+html[data-custom-theme="true"] .light-topnav-item--active:hover,
+html[data-custom-theme="true"] .top-submenu-item:hover,
+html[data-custom-theme="true"] .top-submenu-item--active {
+    color: var(--navigation-foreground);
+    text-shadow: none;
+}
+
+html[data-custom-theme="true"] .light-topnav-item--active::after {
+    background: var(--navigation-foreground);
+}
+
 .light-sidebar {
     position: fixed;
     left: 0;

frontend-web/src/components/workspace/appearance-controls.tsx

@@ -26,7 +26,7 @@ import { buildLightAppUrl } from "@/strategy-components/lib/light-app";
  *   - "banner-dark" / "banner-light"：Header 落在主题 banner 上（白字 / 浅色 hover）。
  *   - "content"：简洁模式聊天页浅底顶栏，走 foreground / muted-foreground。
  */
-export type AppearanceControlTone = "banner-dark" | "banner-light" | "content";
+export type AppearanceControlTone = "banner-dark" | "banner-light" | "banner-custom" | "content";
 
 // 换肤色板：红色=红白主题(light)，蓝色=浅蓝主题(lightblue)，冰川蓝=柔和浅蓝主题(iceblue)，浅黄色=柔和黄主题(lightyellow)，深蓝色=深色主题(dark)
 export const THEME_SWATCHES: { id: ThemeType; label: string; color: string }[] = [
@@ -43,6 +43,8 @@ const triggerToneClass = (tone: AppearanceControlTone) =>
     ? "text-slate-400 hover:bg-slate-800/50 hover:text-slate-400"
     : tone === "banner-light"
       ? "text-white hover:bg-[var(--brand-950)] hover:text-white active:bg-[#8a0618]"
+      : tone === "banner-custom"
+        ? "text-[var(--navigation-foreground)] hover:bg-white/20 hover:text-[var(--navigation-foreground)] active:bg-white/30"
       : "text-muted-foreground hover:bg-muted hover:text-foreground";
 
 export function CompactShortcutButtons({ tone }: { tone: AppearanceControlTone }) {

frontend-web/src/components/workspace/settings/custom-theme-library-settings.tsx

@@ -70,6 +70,18 @@ const ADVANCED_COLOR_FIELDS: Array<{
     description: "主按钮悬停时的背景色",
     token: "--theme-button-hover",
   },
+  {
+    key: "navigation_gradient_start",
+    label: "导航渐变起点",
+    description: "全量模式顶部导航栏左侧的渐变色",
+    token: "--navigation-gradient-start",
+  },
+  {
+    key: "navigation_gradient_end",
+    label: "导航渐变终点",
+    description: "全量模式顶部导航栏右侧的渐变色",
+    token: "--navigation-gradient-end",
+  },
   {
     key: "selected_background",
     label: "选中背景",
@@ -268,14 +280,20 @@ function CustomThemePreview({ theme }: { theme: CustomThemePreset }) {
       style={tokens}
       aria-label={`${theme.name} 的颜色预览`}
     >
-      <div className="flex items-center gap-2 border-b border-[var(--border)] bg-[var(--background)] px-3 py-2">
+      <div
+        className="flex items-center gap-2 border-b border-[var(--border)] px-3 py-2"
+        style={{
+          backgroundImage:
+            "linear-gradient(105deg, var(--navigation-gradient-start) 0%, var(--primary) 52%, var(--navigation-gradient-end) 100%)",
+        }}
+      >
         <span
-          className="flex size-5 items-center justify-center rounded-md bg-[var(--primary)] text-[10px] font-bold text-[var(--primary-foreground)] ring-2 ring-[var(--ring)]"
+          className="flex size-5 items-center justify-center rounded-md bg-white/25 text-[10px] font-bold text-[var(--navigation-foreground)] ring-2 ring-white/35"
           aria-hidden
         >
           C
         </span>
-        <span className="text-xs font-semibold text-[var(--foreground)]">
+        <span className="text-xs font-semibold text-[var(--navigation-foreground)]">
           实时预览
         </span>
         <span