fix: terminal handle edge flipping and tab number reuse

[bajrangCoder]

No description provided.

[greptile-apps]

Greptile Summary

This PR fixes two terminal UX issues: terminal tab numbers now reuse available slots instead of incrementing indefinitely, and touch selection handles now flip orientation when they would appear outside the viewport.

Key Changes:

• Added extractTerminalNumber() and getNextAvailableTerminalNumber() methods to intelligently track and reuse terminal numbers
• Terminal instances now store their number and use a stable titlePrefix to prevent tab titles from changing unexpectedly
• Refactored handle orientation logic into reusable methods that dynamically adjust based on viewport boundaries
• Selection handles now flip when positioned near left/right viewport edges, ensuring they remain visible and usable

Impact:

• Users will see cleaner terminal numbering (e.g., "Terminal 1, 2, 3" instead of "Terminal 1, 5, 8" after closing some)
• Touch selection near screen edges is now more intuitive as handles automatically reorient themselves

Confidence Score: 5/5

• This PR is safe to merge with minimal risk
• The implementation is well-structured with proper null/undefined handling, edge case coverage, and backward compatibility. Both fixes address specific UX issues without introducing breaking changes. The terminal number extraction uses a robust regex pattern, and the handle orientation logic correctly preserves existing transforms while adjusting orientation.
• No files require special attention

Important Files Changed

Filename	Overview
src/components/terminal/terminalManager.js	Added terminal number extraction and reuse logic to prevent number gaps when terminals are closed; replaced counter-based naming with stable title prefixes per instance.
src/components/terminal/terminalTouchSelection.js	Implemented dynamic handle orientation that flips selection handles when they would appear outside the viewport boundaries, improving UX for edge selections.

_{Last reviewed commit: 29c59eb}