Chat History Top/Bottom Scroll With Keybindings

[angelplusultra]

Pull Request Type

• ✨ feat

Relevant Issues

resolves #4845

What is in this change?

Adds keyboard shortcuts to navigate chat history: Ctrl/Cmd + Up Arrow scrolls to the top of the chat history, and Ctrl/Cmd + Down Arrow scrolls to the bottom. These shortcuts work from anywhere in the chat container (not just when focused on the prompt input) and preserve the existing auto-scroll behavior during message streaming.

Key Features:

• Keyboard shortcuts: Ctrl/Cmd + Up and Ctrl/Cmd + Down for quick navigation
• Cross-platform support: Automatically detects Mac (Cmd) vs Windows/Linux (Ctrl)
• Smooth scrolling: Both directions use smooth scroll animations for better UX
• Auto-scroll preservation: Does not interfere with existing auto-scroll logic that scrolls to bottom when prompts are sent and during response streaming

Technical Implementation:

• Converted ChatHistory component to use forwardRef to expose scroll methods
• Added isProgrammaticScroll flag to distinguish keyboard-triggered scrolls from user-initiated scrolls
• Modified auto-scroll effect to skip during programmatic scrolls to prevent conflicts
• Updated scroll handler to ignore programmatic scrolls when detecting user scrolling state
• When scrolling to bottom via keyboard, automatically re-enables auto-scroll for streaming responses

Developer Validations

• I ran yarn lint from the root of the repo & committed changes
• Relevant documentation has been updated (N/A - no user-facing docs needed)
• I have tested my code functionality
• Docker build succeeds locally (N/A - frontend-only changes)