feat(webui): highlight slash commands and app mentions (#4933)

webui/src/components/thread/ThreadViewport.tsx

@@ -22,7 +22,7 @@ import {
   promptTop,
 } from "@/components/thread/promptNavigation";
 import { cn } from "@/lib/utils";
-import type { CliAppInfo, McpPresetInfo, UIMessage } from "@/lib/types";
+import type { CliAppInfo, McpPresetInfo, SlashCommand, UIMessage } from "@/lib/types";
 
 export interface ThreadViewportHandle {
   jumpToUserPrompt: (promptId: string) => void;
@@ -40,6 +40,7 @@ interface ThreadViewportProps {
   showScrollToBottomButton?: boolean;
   cliApps?: CliAppInfo[];
   mcpPresets?: McpPresetInfo[];
+  slashCommands?: SlashCommand[];
   forkBoundaryMessageCount?: number | null;
   hasMoreBefore?: boolean;
   loadingOlder?: boolean;
@@ -111,6 +112,7 @@ export const ThreadViewport = forwardRef<ThreadViewportHandle, ThreadViewportPro
   showScrollToBottomButton = true,
   cliApps = [],
   mcpPresets = [],
+  slashCommands = [],
   forkBoundaryMessageCount = null,
   hasMoreBefore = false,
   loadingOlder = false,
@@ -526,6 +528,7 @@ export const ThreadViewport = forwardRef<ThreadViewportHandle, ThreadViewportPro
                   hiddenUserMessageCount={hiddenUserMessageCount}
                   cliApps={cliApps}
                   mcpPresets={mcpPresets}
+                  slashCommands={slashCommands}
                   forkBoundaryMessageCount={visibleForkBoundaryMessageCount}
                   onOpenFilePreview={onOpenFilePreview}
                   onForkFromMessage={onForkFromMessage}