feat(input): add ArrowUp/ArrowDown input history navigation

[c-rick]

This pull request adds per-session input history navigation to the chat input component, enabling users to recall previous messages with ArrowUp/ArrowDown keys. It also improves cursor position tracking for the rich text input. The most important changes are grouped below.

Input History Navigation Enhancements:

• Added a memoized userHistory array in ChatDisplay.tsx to collect trimmed user messages in reverse order for input history navigation.
• Passed userHistory as the inputHistory prop to FreeFormInput, and updated the FreeFormInputProps interface to support this feature. [1] [2]
• Implemented ArrowUp/ArrowDown key handling in FreeFormInput.tsx to navigate through input history when the cursor is at the start/end of the input, including draft preservation and restoration logic.
• Improved session switching logic in FreeFormInput.tsx to reset input history navigation and restore drafts appropriately.
• Reset history draft on input submission to avoid stale drafts.

Rich Text Input Improvements:

• Added a selectionchange event listener in rich-text-input.tsx to keep the cursor position reference up-to-date, ensuring correct cursor tracking during navigation and editing.