fix: center header logo and fix theme color variants in dark mode

- Logo 区内容居中
- 主题色改为注入 <style> 生成明/暗两套派生变量：暗黑下 light-N 混黑、dark-2 混白，避免侧栏/按钮高亮在暗黑模式下变近白

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/components/ty-header.vue

@@ -1,11 +1,7 @@
 <template>
   <header class="ty-header" :class="{ 'is-fixed': fixed }">
     <div class="ty-header__left">
-      <div
-        class="ty-header__logo"
-        :class="{ 'is-icon': !showTitle }"
-        :style="logoWidth != null ? { width: `${logoWidth}px` } : undefined"
-      >
+      <div class="ty-header__logo" :style="logoWidth != null ? { width: `${logoWidth}px` } : undefined">
         <img v-if="logo" class="ty-header__logo-img" :src="logo" alt="logo" />
         <span v-if="showTitle" class="ty-header__title">{{ title }}</span>
       </div>
@@ -172,18 +168,14 @@ function onUserCommand(command: string): void {
   &__logo {
     display: flex;
     align-items: center;
+    justify-content: center;
     gap: 8px;
     flex-shrink: 0;
     overflow: hidden;
     height: var(--ty-header-height, 56px);
-    padding: 0 12px;
+    padding: 0 8px;
     background: var(--wm-bg-color-base);
     border-right: 1px solid var(--wm-border-color-light);
-
-    &.is-icon {
-      justify-content: center;
-      gap: 0;
-    }
   }
 
   &__logo-img {

src/utils/theme.ts

@@ -1,3 +1,5 @@
+const THEME_STYLE_ID = 'sysmgr-theme'
+
 /** 十六进制颜色 → RGB 三元组。 */
 function hexToRgb(hex: string): [number, number, number] {
   let h = hex.replace('#', '')
@@ -18,26 +20,57 @@ function mix(base: string, target: string, weight: number): string {
   return rgbToHex(r1 + (r2 - r1) * weight, g1 + (g2 - g1) * weight, b1 + (b2 - b1) * weight)
 }
 
-/** 应用主题色：写入 Element Plus 主色派生变量与 --wm-color-* 令牌（内联样式优先级最高，明暗皆生效）。 */
+/** 生成一组 CSS 变量声明。 */
+function cssVars(vars: [string, string][]): string {
+  return vars.map(([k, v]) => `${k}: ${v};`).join('')
+}
+
+/**
+ * 由主色生成明/暗两套 Element Plus 主色派生变量与 --wm-color-* 令牌，
+ * 注入 <style id="sysmgr-theme">。暗黑模式把 light-N 改为混黑（作深色高亮底）、
+ * dark-2 改为混白（作深色对比色），保证暗黑下侧栏/按钮高亮不刺眼。
+ */
 export function applyThemeColor(primary: string): void {
-  const root = document.documentElement
-  const set = (name: string, value: string) => root.style.setProperty(name, value)
+  const mixWhite = (w: number) => mix(primary, '#ffffff', w)
+  const mixBlack = (w: number) => mix(primary, '#000000', w)
 
-  set('--el-color-primary', primary)
-  set('--el-color-primary-light-3', mix(primary, '#ffffff', 0.3))
-  set('--el-color-primary-light-5', mix(primary, '#ffffff', 0.5))
-  set('--el-color-primary-light-7', mix(primary, '#ffffff', 0.7))
-  set('--el-color-primary-light-8', mix(primary, '#ffffff', 0.8))
-  set('--el-color-primary-light-9', mix(primary, '#ffffff', 0.9))
-  set('--el-color-primary-dark-2', mix(primary, '#000000', 0.2))
+  // 明亮模式
+  const light: [string, string][] = [
+    ['--el-color-primary', primary],
+    ['--el-color-primary-light-3', mixWhite(0.3)],
+    ['--el-color-primary-light-5', mixWhite(0.5)],
+    ['--el-color-primary-light-7', mixWhite(0.7)],
+    ['--el-color-primary-light-8', mixWhite(0.8)],
+    ['--el-color-primary-light-9', mixWhite(0.9)],
+    ['--el-color-primary-dark-2', mixBlack(0.2)],
+    ['--wm-color-primary', primary],
+    ...([1, 2, 3, 5, 7, 8, 9].map((i) => [`--wm-color-primary-light-${i}`, mixWhite(i / 10)] as [string, string])),
+    ['--wm-color-primary-dark-1', mixBlack(0.1)],
+    ['--wm-color-primary-dark-2', mixBlack(0.2)],
+  ]
 
-  // 同步 --wm-color-primary 及色阶，保证 UnoCSS（text-primary 等）一致
-  set('--wm-color-primary', primary)
-  ;[1, 2, 3, 5, 7, 8, 9].forEach((i) => {
-    set(`--wm-color-primary-light-${i}`, mix(primary, '#ffffff', i / 10))
-  })
-  set('--wm-color-primary-dark-1', mix(primary, '#000000', 0.1))
-  set('--wm-color-primary-dark-2', mix(primary, '#000000', 0.2))
+  // 暗黑模式：light-N 混黑、dark-2 混白
+  const dark: [string, string][] = [
+    ['--el-color-primary', primary],
+    ['--el-color-primary-light-3', mixBlack(0.2)],
+    ['--el-color-primary-light-5', mixBlack(0.4)],
+    ['--el-color-primary-light-7', mixBlack(0.6)],
+    ['--el-color-primary-light-8', mixBlack(0.7)],
+    ['--el-color-primary-light-9', mixBlack(0.8)],
+    ['--el-color-primary-dark-2', mixWhite(0.3)],
+    ['--wm-color-primary', primary],
+    ...([1, 2, 3, 5, 7, 8, 9].map((i) => [`--wm-color-primary-light-${i}`, mixBlack(i / 10)] as [string, string])),
+    ['--wm-color-primary-dark-1', mixWhite(0.1)],
+    ['--wm-color-primary-dark-2', mixWhite(0.2)],
+  ]
+
+  let el = document.getElementById(THEME_STYLE_ID) as HTMLStyleElement | null
+  if (!el) {
+    el = document.createElement('style')
+    el.id = THEME_STYLE_ID
+    document.head.appendChild(el)
+  }
+  el.textContent = `:root{${cssVars(light)}}html.dark{${cssVars(dark)}}`
 }
 
 /** 应用暗黑模式：同时切换 Element Plus 的 html.dark 与现有 data-theme 令牌。 */