fix(message-input): persist draft across restarts by keying on conversation id

src/components/chat/message-input.tsx

@@ -407,7 +407,7 @@ export function MessageInput({
     [tExperts]
   )
   const { shortcuts } = useShortcutSettings()
-  const effectiveDraftStorageKey = draftStorageKey ?? attachmentTabId ?? null
+  const effectiveDraftStorageKey = draftStorageKey ?? null
   const resolvedPlaceholder = placeholder ?? t("askAnything")
   const [text, setText] = useState(() => {
     if (!effectiveDraftStorageKey) return ""

src/components/conversations/conversation-detail-panel.tsx

@@ -66,7 +66,7 @@ import {
 import {
   buildConversationDraftStorageKey,
   buildNewConversationDraftStorageKey,
-  moveMessageInputDraft,
+  clearMessageInputDraft,
 } from "@/lib/message-input-draft"
 import {
   ContextMenu,
@@ -268,10 +268,10 @@ const ConversationTabView = memo(function ConversationTabView({
   const externalId = detail?.summary.external_id ?? undefined
   const draftStorageKey = useMemo(() => {
     if (dbConversationId != null) {
-      return buildConversationDraftStorageKey(selectedAgent, dbConversationId)
+      return buildConversationDraftStorageKey(dbConversationId)
     }
-    return buildNewConversationDraftStorageKey({ tabId })
-  }, [dbConversationId, tabId, selectedAgent])
+    return buildNewConversationDraftStorageKey()
+  }, [dbConversationId])
   // Use the per-tab workingDir (derived from the tab's own folderId by the
   // parent) rather than the active folder's path — otherwise switching tabs
   // briefly exposes the previous folder's path to the ACP auto-connect
@@ -625,10 +625,7 @@ const ConversationTabView = memo(function ConversationTabView({
             title,
             effectiveConversationId
           )
-          moveMessageInputDraft(
-            buildNewConversationDraftStorageKey({ tabId }),
-            buildConversationDraftStorageKey(selectedAgent, newConversationId)
-          )
+          clearMessageInputDraft(buildNewConversationDraftStorageKey())
           statusUpdatedRef.current = false
           // If the turn already finished while we were creating the
           // conversation, apply the deferred status directly instead

src/lib/message-input-draft.ts

@@ -1,7 +1,5 @@
 "use client"
 
-import type { AgentType } from "@/lib/types"
-
 interface PersistedDraftState {
   text: string
 }
@@ -83,16 +81,13 @@ function scheduleDraftPersistence(): void {
 }
 
 export function buildConversationDraftStorageKey(
-  agentType: AgentType,
   conversationId: number
 ): string {
-  return `conv:${agentType}:${conversationId}`
+  return `conv:${conversationId}`
 }
 
-export function buildNewConversationDraftStorageKey(params: {
-  tabId: string
-}): string {
-  return `new:${params.tabId}`
+export function buildNewConversationDraftStorageKey(): string {
+  return "new"
 }
 
 export function loadMessageInputDraft(draftKey: string): string | null {
@@ -137,17 +132,3 @@ export function clearMessageInputDraft(draftKey: string): void {
     /* ignore */
   }
 }
-
-export function moveMessageInputDraft(
-  fromDraftKey: string,
-  toDraftKey: string
-): void {
-  if (fromDraftKey === toDraftKey) return
-
-  const sourceText = loadMessageInputDraft(fromDraftKey)
-  const targetText = loadMessageInputDraft(toDraftKey)
-  if (sourceText && !targetText) {
-    saveMessageInputDraft(toDraftKey, sourceText)
-  }
-  clearMessageInputDraft(fromDraftKey)
-}