fix(ui): tune light mode contrast

packages/ui/src/components/instance/instance-shell2.tsx

@@ -15,7 +15,6 @@ import { Accordion } from "@kobalte/core"
 import { ChevronDown, TerminalSquare, Trash2, XOctagon } from "lucide-solid"
 import AppBar from "@suid/material/AppBar"
 import Box from "@suid/material/Box"
-import Divider from "@suid/material/Divider"
 import Drawer from "@suid/material/Drawer"
 import IconButton from "@suid/material/IconButton"
 import Toolbar from "@suid/material/Toolbar"
@@ -916,7 +915,7 @@ const InstanceShell2: Component<InstanceShellProps> = (props) => {
           showFooter={false}
         />
 
-        <Divider />
+        <div class="session-sidebar-separator" />
         <Show when={activeSessionForInstance()}>
           {(activeSession) => (
             <>

packages/ui/src/components/markdown.tsx

@@ -1,5 +1,5 @@
 import { createEffect, createMemo, createSignal, onCleanup, onMount } from "solid-js"
-import { renderMarkdown, onLanguagesLoaded, decodeHtmlEntities } from "../lib/markdown"
+import { renderMarkdown, onLanguagesLoaded, decodeHtmlEntities, setMarkdownTheme } from "../lib/markdown"
 import { useGlobalCache } from "../lib/hooks/use-global-cache"
 import type { TextPart, RenderCache } from "../types/message"
 import { getLogger } from "../lib/logger"
@@ -72,6 +72,9 @@ export function Markdown(props: MarkdownProps) {
   createEffect(async () => {
     const { part, text, themeKey, highlightEnabled, version } = resolved()
 
+    // Ensure the markdown highlighter theme matches the active UI theme.
+    setMarkdownTheme(themeKey === "dark")
+
     latestRequestedText = text
 
     const cacheMatches = (cache: RenderCache | undefined) => {
@@ -171,6 +174,8 @@ export function Markdown(props: MarkdownProps) {
 
       const { part, text, themeKey, version } = resolved()
 
+      setMarkdownTheme(themeKey === "dark")
+
       if (latestRequestedText !== text) {
         return
       }