refactor(gitcommit): Replace chat:add_reference with chat:add_context

[jinzhongjia]

• Optimize context processing related to Slash commands
• Fix context references during error handling

[gemini-code-assist]

Summary of Changes

Hello @jinzhongjia, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request performs a targeted refactoring within the gitcommit extension. Its primary purpose is to update the function used for adding context to the chat, transitioning from chat:add_reference to chat:add_context. This change aims to improve the overall context processing for slash commands and to ensure more consistent and accurate context handling, especially when dealing with error conditions related to git operations.

Highlights

• Refactoring: Replaced all instances of the chat:add_reference function call with chat:add_context within the gitcommit extension's init.lua file.
• Context Handling Standardization: Standardized the method for adding context to the chat interface, impacting both successful data presentation (e.g., selected commit content) and various error scenarios (e.g., no commits found, git command execution failures, or not being in a git repository).
• Improved Slash Command Processing: This change aligns with the pull request's stated goals of optimizing context processing related to Slash commands and ensuring more robust context references during error handling.

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[gemini-code-assist]

Code Review

This pull request refactors the code to use chat:add_context instead of chat:add_reference. The changes optimize context processing and improve error handling. A minor inconsistency in an error message format was identified and should be addressed to ensure uniform behavior.