fix(tui): prune messages on prompt submit instead of during streaming

packages/opencode/src/cli/cmd/tui/component/prompt/index.tsx

@@ -1089,6 +1089,8 @@ export function Prompt(props: PromptProps) {
       sessionID = res.data.id
     }
 
+    sync.session.prune(sessionID)
+
     const messageID = MessageID.ascending()
     let inputText = store.prompt.input
 

packages/opencode/src/cli/cmd/tui/context/sync.tsx

@@ -268,25 +268,6 @@ export const { use: useSync, provider: SyncProvider } = createSimpleContext({
               draft.splice(result.index, 0, event.properties.info)
             }),
           )
-          const updated = store.message[event.properties.info.sessionID]
-          if (updated.length > 100) {
-            const oldest = updated[0]
-            batch(() => {
-              setStore(
-                "message",
-                event.properties.info.sessionID,
-                produce((draft) => {
-                  draft.shift()
-                }),
-              )
-              setStore(
-                "part",
-                produce((draft) => {
-                  delete draft[oldest.id]
-                }),
-              )
-            })
-          }
           break
         }
         case "message.removed": {
@@ -543,6 +524,22 @@ export const { use: useSync, provider: SyncProvider } = createSimpleContext({
           )
           fullSyncedSessions.add(sessionID)
         },
+        prune(sessionID: string) {
+          const messages = store.message[sessionID]
+          if (!messages || messages.length <= 100) return
+          const excess = messages.length - 100
+          const toRemove = messages.slice(0, excess)
+          batch(() => {
+            setStore("message", sessionID, produce((draft) => {
+              draft.splice(0, excess)
+            }))
+            setStore("part", produce((draft) => {
+              for (const msg of toRemove) {
+                delete draft[msg.id]
+              }
+            }))
+          })
+        },
       },
       bootstrap,
     }