refactor: remove remaining dead code

webui/src/components/thread/AgentActivityCluster.tsx

@@ -51,7 +51,7 @@ import type { CliAppInfo, McpPresetInfo, ToolProgressEvent, UIFileEdit, UIMessag
 
 const ACTIVITY_SCROLL_NEAR_BOTTOM_PX = 24;
 
-export { isAgentActivityMember, isReasoningOnlyAssistant };
+export { isAgentActivityMember };
 
 interface ActivityCounts {
   reasoningSteps: number;

webui/src/components/thread/activity/FileEditRow.tsx

@@ -155,7 +155,7 @@ function FileEditRow({
   );
 }
 
-export function hasVisibleDiffStats(edit: Pick<FileEditSummary, "added" | "deleted">): boolean {
+function hasVisibleDiffStats(edit: Pick<FileEditSummary, "added" | "deleted">): boolean {
   return edit.added > 0 || edit.deleted > 0;
 }
 

webui/src/components/thread/activity/generic-tool-model.ts

@@ -3,7 +3,7 @@ import { compactActivityPath, redactActivityText } from "./activity-text";
 export type GenericToolStatus = "running" | "done" | "error";
 export type ToolFamily = "content-search" | "file-search" | "list" | "read" | "memory" | "generic";
 
-export interface ToolField {
+interface ToolField {
   key:
     | "query"
     | "pattern"

webui/src/components/thread/activity/web-search-model.ts

@@ -7,7 +7,7 @@ import { displayWebHost, formatCompactWebUrl, parseSafeActivityHttpUrl } from ".
 export type WebSearchStatus = "running" | "done" | "error";
 export type WebSearchTarget = "web" | "x";
 
-export interface WebSearchSource {
+interface WebSearchSource {
   title: string;
   href: string;
   host: string;

webui/src/components/thread/promptNavigation.ts

@@ -26,13 +26,13 @@ export function userPromptAnchors(messages: UIMessage[]): PromptAnchor[] {
   });
 }
 
-export function promptLabel(content: string, index: number): string {
+function promptLabel(content: string, index: number): string {
   const text = content.replace(/\s+/g, " ").trim();
   if (!text) return `Prompt ${index + 1}`;
   return truncatePreview(text, 80);
 }
 
-export function promptPreview(content: string, index: number): string {
+function promptPreview(content: string, index: number): string {
   const text = compactPreview(content);
   if (!text) return `Prompt ${index + 1}`;
   return truncatePreview(text, 320);