chore: Update .gitignore to include imgui.ini

[ViTeXFTW]

Greptile Overview

Greptile Summary

Added imgui.ini to .gitignore to exclude user-specific ImGui UI configuration from version control. This file is automatically generated by ImGui and stores window positions, sizes, and other UI preferences that should remain local to each developer's environment.

Confidence Score: 5/5

• This PR is safe to merge with no risk
• The change correctly adds imgui.ini to gitignore, which is a standard best practice for ImGui-based applications since this file contains user-specific UI preferences
• No files require special attention

Important Files Changed

Filename	Overview
.gitignore	Added imgui.ini to gitignore to exclude ImGui configuration file from version control

[greptile-apps]

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