fix(session-recovery): improve empty message index search with expanded range

Expand the search range when finding empty messages by index to better handle API index vs storage index mismatches. This increases robustness when searching for messages to sanitize with more fallback indices.

🤖 Generated with assistance of OhMyOpenCode (https://github.com/code-yeongyu/oh-my-opencode)

src/hooks/session-recovery/storage.ts

@@ -135,7 +135,16 @@ export function findEmptyMessageByIndex(sessionID: string, targetIndex: number):
   const messages = readMessages(sessionID)
 
   // API index may differ from storage index due to system messages
-  const indicesToTry = [targetIndex, targetIndex - 1, targetIndex - 2]
+  const indicesToTry = [
+    targetIndex,
+    targetIndex - 1,
+    targetIndex + 1,
+    targetIndex - 2,
+    targetIndex + 2,
+    targetIndex - 3,
+    targetIndex - 4,
+    targetIndex - 5,
+  ]
 
   for (const idx of indicesToTry) {
     if (idx < 0 || idx >= messages.length) continue