Revert "fix: dedupe thread items on resume"

This reverts commit 3c273a1.

Author: Dimillian

src/hooks/useThreads.ts

@@ -1090,66 +1090,23 @@ function chooseRicherItem(remote: ConversationItem, local: ConversationItem) {
   return remote;
 }
 
-function itemSignature(item: ConversationItem) {
-  if (item.kind === "message") {
-    return `message:${item.role}:${item.text}`;
-  }
-  if (item.kind === "reasoning") {
-    return `reasoning:${item.summary}:${item.content}`;
-  }
-  if (item.kind === "tool") {
-    return `tool:${item.toolType}:${item.title}:${item.detail}`;
-  }
-  if (item.kind === "diff") {
-    return `diff:${item.title}:${item.diff}`;
-  }
-  if (item.kind === "review") {
-    return `review:${item.state}:${item.text}`;
-  }
-  return null;
-}
-
 function mergeThreadItems(
   remoteItems: ConversationItem[],
   localItems: ConversationItem[],
 ) {
   if (!localItems.length) {
     return remoteItems;
   }
-  const merged = [...remoteItems];
-  const byId = new Map(remoteItems.map((item, index) => [item.id, index]));
-  const bySignature = new Map<string, number[]>();
-  remoteItems.forEach((item, index) => {
-    const signature = itemSignature(item);
-    if (!signature) {
-      return;
-    }
-    const entries = bySignature.get(signature);
-    if (entries) {
-      entries.push(index);
-    } else {
-      bySignature.set(signature, [index]);
-    }
+  const byId = new Map(remoteItems.map((item) => [item.id, item]));
+  const merged = remoteItems.map((item) => {
+    const local = localItems.find((entry) => entry.id === item.id);
+    return local ? chooseRicherItem(item, local) : item;
   });
-
   localItems.forEach((item) => {
-    const byIdIndex = byId.get(item.id);
-    if (byIdIndex !== undefined) {
-      merged[byIdIndex] = chooseRicherItem(merged[byIdIndex], item);
-      return;
+    if (!byId.has(item.id)) {
+      merged.push(item);
     }
-    const signature = itemSignature(item);
-    if (signature) {
-      const matches = bySignature.get(signature);
-      if (matches && matches.length > 0) {
-        const matchIndex = matches.shift() as number;
-        merged[matchIndex] = chooseRicherItem(merged[matchIndex], item);
-        return;
-      }
-    }
-    merged.push(item);
   });
-
   return merged;
 }