fix: re-read fresh messages before empty scan & dedup isRecord import

- Re-read messages from SDK after injectTextPartAsync to prevent stale
  snapshot from causing duplicate placeholder injection (P2)
- Replace local isRecord with shared import from record-type-guard (P3)

src/hooks/session-recovery/recover-empty-content-message-sdk.ts

@@ -91,7 +91,8 @@ export async function recoverEmptyContentMessageFromSDK(
     }
   }
 
-  const emptyMessageIDs = findEmptyMessagesFromSDK(messages)
+  const freshMessages = await readMessagesFromSDK(client, sessionID)
+  const emptyMessageIDs = findEmptyMessagesFromSDK(freshMessages)
   for (const messageID of emptyMessageIDs) {
     if (
       await dependencies.replaceEmptyTextPartsAsync(

src/hooks/session-recovery/storage/messages-reader.ts

@@ -4,13 +4,10 @@ import type { PluginInput } from "@opencode-ai/plugin"
 import type { StoredMessageMeta } from "../types"
 import { getMessageDir } from "./message-dir"
 import { isSqliteBackend } from "../../../shared"
+import { isRecord } from "../../../shared/record-type-guard"
 
 type OpencodeClient = PluginInput["client"]
 
-function isRecord(value: unknown): value is Record<string, unknown> {
-  return typeof value === "object" && value !== null
-}
-
 function normalizeSDKMessage(
   sessionID: string,
   value: unknown