feat(xref): detach, unload, reload, bind, overlay, and path operations

Detach, unload, reload preserving host layer overrides, bind, overlay, and saved-path editing, with per-tab session state and a read-only web list.

src/app/commands/mod.rs

@@ -713,6 +713,7 @@ inventory::submit!(crate::command::CommandRegistration {
         "XDATA",
         "XR",
         "XREF",
+        "-XREF",
         "XREFMAN",
         "XRELOAD",
         "ZOOM",