feat: enhance dark mode support across various components

- Updated styles in AccountSetting, SystemConfig, Version, and other components to improve dark mode visibility.
- Added dark mode classes for text and background colors to ensure better contrast and readability.
- Modified CSS variables in dark.css for consistent theming.
- Improved accessibility by ensuring all text elements are legible in dark mode.

src/pages/home/components/chat/ChatTypingIndicator.vue

@@ -2,7 +2,7 @@
   <div class="flex items-start gap-3 justify-start">
     <ChatAvatar :src="aiAvatarSrc" />
     <div
-      class="px-4 py-3 bg-white border border-[#E5E8EE] rounded-2xl rounded-tl-sm flex items-center gap-1"
+      class="px-4 py-3 bg-white dark:bg-[#1f1f22] border border-[#E5E8EE] dark:border-[#2a2a2d] rounded-2xl rounded-tl-sm flex items-center gap-1"
     >
       <span class="dot" />
       <span class="dot" />