fix(terminal): preserve touch selection while scrolling

[bajrangCoder]

• switch to tap-to-clear instead of clearing on touchstart
• keep selection active during scroll and restore handles/menu after scroll end
• listen to xterm viewport scroll for stable touch-selection behavior

[greptile-apps]

Greptile Summary

This PR significantly improves the terminal touch selection UX by implementing three key enhancements:

Key Changes:

• Tap-to-clear behavior: Replaced immediate selection clearing on touchstart with a smarter tap-to-clear mechanism that only clears when the user taps (no movement) while not scrolling
• Scroll-aware selection: Selection now persists during scrolling with handles and context menu temporarily hidden, then restored after scroll ends (100ms delay)
• Better scroll detection: Listens to .xterm-viewport scroll events instead of the terminal element for more stable touch-selection behavior

Implementation Quality:

• Proper state management with new flags (isSelectionTouchActive, pendingSelectionClearTouch, isTerminalScrolling)
• Clean timeout management with proper cleanup in destroy() and clearSelection()
• Handles edge cases well (dragging handles, protected selection, concurrent scrolling)
• The removed onTerminalAreaTouchStart method and its immediate-clear behavior is appropriately replaced by the new tap-to-clear logic

User Experience Impact:
Users can now scroll through terminal output without losing their selection, and accidental touches during scrolling won't clear the selection. The tap-to-clear mechanism provides intentional selection dismissal.

Confidence Score: 5/5

• This PR is safe to merge with no identified issues
• The implementation demonstrates solid engineering with proper state management, comprehensive cleanup, and well-handled edge cases. The changes are focused on a single component with clear intent, and all new state variables are properly initialized, managed, and cleaned up.
• No files require special attention

Important Files Changed

Filename	Overview
src/components/terminal/terminalTouchSelection.js	Improves touch selection UX by switching to tap-to-clear and preserving selection during scrolling with proper state management

_{Last reviewed commit: bd3b9db}