fix: prevent message sync between forked sessions by generating unique IDs

[lvguanjun]

💻 变更类型 | Change Type

• feat
• fix
• refactor
• perf
• style
• test
• docs
• ci
• chore
• build

🔀 变更说明 | Description of Change

Fixed message synchronization issue in chat session fork functionality. In the previous implementation, messages in forked sessions shared the same object references with the original session, causing edits in one session to affect the other. This has been resolved by implementing deep copy of messages during fork operation and generating new IDs for each message, ensuring complete independence between sessions.

Key changes:

• Implemented deep copy of messages in forkSession method
• Generated new unique IDs for each message in forked session

📝 补充信息 | Additional Information

This fix addresses the following scenarios:

1. Messages in new and original sessions are now completely independent after forking
2. Editing messages in either session no longer affects the other session

This change does not impact other functionalities and only optimizes the session fork behavior to meet user expectations.

Summary by CodeRabbit

• Bug Fixes
  • Improved session management by ensuring each chat session has unique message identifiers
  • Prevented potential data integrity issues when forking chat sessions

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[coderabbitai]

Walkthrough

The pull request focuses on improving the forkSession method in the chat store. The primary modification addresses how messages are copied when creating a new session. Instead of directly assigning messages, which could lead to shared references, the implementation now creates a deep copy of each message. Each message in the new session receives a unique ID using nanoid(), ensuring that modifications in one session do not affect the other.

Changes

File	Change Summary
app/store/chat.ts	Updated forkSession() method to create deep copies of messages with unique IDs

Poem

🐰 A rabbit's tale of sessions split,
Where messages dance with a new-minted wit
Deep copies bloom, no reference shared
Each message unique, carefully prepared
In the world of chats, independence reigns! 🌟

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📜 Recent review details

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Review profile: CHILL
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📥 Commits

Reviewing files that changed from the base of the PR and between 0af04e0 and 840c151.

📒 Files selected for processing (1)

• app/store/chat.ts (1 hunks)

🔇 Additional comments (1)

app/store/chat.ts (1)

217-221: Consider truly deep copying nested objects

While using the spread operator helps avoid shared references at the top level, it does not fully deep copy nested structures. If any nested objects within msg could be updated elsewhere, those references remain shared. Consider implementing a more robust deep copy approach (e.g., structured clone, a specialized library, or JSON.parse(JSON.stringify()) in simpler scenarios) to ensure full message independence.

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