Fix coalescing text semantics for non-streaming events and remove unused useThreadIdsByProjectId hook

- In coalesceOrchestrationUiEvents, when the later event has streaming=false
  and non-empty text, use the later event's text as a replacement instead of
  concatenating, matching the store handler's replacement semantics.
- Remove unused useThreadIdsByProjectId hook and its selectThreadIdsByProjectId
  import from storeSelectors.ts.

Author: cursoragent

apps/web/src/routes/__root.tsx

@@ -175,7 +175,10 @@ function coalesceOrchestrationUiEvents(
           ...event.payload,
           attachments: event.payload.attachments ?? previous.payload.attachments,
           createdAt: previous.payload.createdAt,
-          text: previous.payload.text + event.payload.text,
+          text:
+            !event.payload.streaming && event.payload.text.length > 0
+              ? event.payload.text
+              : previous.payload.text + event.payload.text,
         },
       };
       continue;

apps/web/src/storeSelectors.ts

@@ -1,10 +1,9 @@
-import { type ProjectId, type ThreadId } from "@t3tools/contracts";
+import { type ThreadId } from "@t3tools/contracts";
 import { useMemo } from "react";
 import {
   selectProjectById,
   selectSidebarThreadSummaryById,
   selectThreadById,
-  selectThreadIdsByProjectId,
   useStore,
 } from "./store";
 import { type Project, type SidebarThreadSummary, type Thread } from "./types";
@@ -25,8 +24,3 @@ export function useSidebarThreadSummaryById(
   const selector = useMemo(() => selectSidebarThreadSummaryById(threadId), [threadId]);
   return useStore(selector);
 }
-
-export function useThreadIdsByProjectId(projectId: ProjectId | null | undefined): ThreadId[] {
-  const selector = useMemo(() => selectThreadIdsByProjectId(projectId), [projectId]);
-  return useStore(selector);
-}