Modernize TableTool for recent macOS

[Copilot]

The app used a range of macOS APIs deprecated since 10.12–10.14, and targeted a deployment minimum of 10.8 with stale Xcode project metadata.

Deprecated API replacements

• Control state: NSOnState/NSOffState → NSControlStateValueOn/NSControlStateValueOff (deprecated 10.14)
• Text alignment: NSRightTextAlignment, NSLeftTextAlignment, NSCenterTextAlignment → NSTextAlignmentRight/Left/Center (deprecated 10.12)
• Pasteboard type: NSStringPboardType → NSPasteboardTypeString (deprecated 10.13)
• TTRowInternalPboardType: re-typed from NSString * to NSPasteboardType for correct semantic typing

// Before
menuItem.state = showingLineNumbers ? NSOnState : NSOffState;
textCell.alignment = NSRightTextAlignment;
validPBoardTypes = @[TTRowInternalPboardType, NSPasteboardTypeTabularText, NSStringPboardType];

// After
menuItem.state = showingLineNumbers ? NSControlStateValueOn : NSControlStateValueOff;
textCell.alignment = NSTextAlignmentRight;
validPBoardTypes = @[TTRowInternalPboardType, NSPasteboardTypeTabularText, NSPasteboardTypeString];

Project settings

• MACOSX_DEPLOYMENT_TARGET: 10.8 → 12.0
• LastUpgradeCheck / LastSwiftUpdateCheck: 0800/0710 → 1500 (Xcode 15)
• developmentRegion: English → en

---

✨ Let Copilot coding agent set things up for you — coding agent works faster and does higher quality work when set up for your repo.