Override tabs and hidden titlebar styles for Worktrunk sidebar (#38)

The "tabs" and "hidden" macos-titlebar-style values don't work with the
Worktrunk sidebar. "tabs" installs its own toolbar without a sidebar
tracking separator, causing the sidebar to be truncated by the toolbar.
"hidden" removes the titlebar entirely, losing the sidebar toggle button.

Override both to use the "transparent" titlebar, which properly installs
the WorktrunkToolbar with a sidebarTrackingSeparator.

Fixes #27

Author: nicosuave

macos/Sources/Features/Terminal/TerminalController.swift

@@ -184,20 +184,13 @@ class TerminalController: BaseTerminalController, TabGroupCloseCoordinator.Contr
             return defaultValue
         }
 
+        // Ghostree: The "tabs" and "hidden" titlebar styles don't work with the
+        // Worktrunk sidebar. "tabs" installs its own toolbar without a sidebar tracking
+        // separator, causing the sidebar to be truncated. "hidden" hides the titlebar
+        // entirely, removing the sidebar toggle. Override both to "transparent".
         let nib = switch config.macosTitlebarStyle {
         case "native": "Terminal"
-        case "hidden": "TerminalHiddenTitlebar"
-        case "transparent": "TerminalTransparentTitlebar"
-        case "tabs":
-#if compiler(>=6.2)
-            if #available(macOS 26.0, *) {
-                "TerminalTabsTitlebarTahoe"
-            } else {
-                "TerminalTabsTitlebarVentura"
-            }
-#else
-            "TerminalTabsTitlebarVentura"
-#endif
+        case "hidden", "tabs", "transparent": "TerminalTransparentTitlebar"
         default: defaultValue
         }