fix: Notification hook works weirdly for subagent sessions (#189)

* fix: Notification hook works weirdly for subagent sessions

- Added mainSessionID check to prevent notifications in subagent sessions
- Only trigger notifications for main session when waiting for user input
- Added comprehensive tests to validate the fix

Issue: https://github.com/code-yeongyu/oh-my-opencode/issues/92

* chore: changes by sisyphus-dev-ai

---------

Co-authored-by: codingsh <codingsh@pm.me>
Co-authored-by: sisyphus-dev-ai <sisyphus-dev-ai@users.noreply.github.com>

src/hooks/session-notification.ts

@@ -1,6 +1,6 @@
 import type { PluginInput } from "@opencode-ai/plugin"
 import { platform } from "os"
-import { subagentSessions } from "../features/claude-code-session-state"
+import { subagentSessions, getMainSessionID } from "../features/claude-code-session-state"
 
 interface Todo {
   content: string
@@ -243,6 +243,10 @@ export function createSessionNotification(
 
       if (subagentSessions.has(sessionID)) return
 
+      // Only trigger notifications for the main session (not subagent sessions)
+      const mainSessionID = getMainSessionID()
+      if (mainSessionID && sessionID !== mainSessionID) return
+
       if (notifiedSessions.has(sessionID)) return
       if (pendingTimers.has(sessionID)) return
       if (executingNotifications.has(sessionID)) return