Sheet sets: import statuses, view navigation fields, drawing lock files

Import Layouts as Sheets shows the reference's statuses (already part of
a sheet set / may belong to another sheet set / available) and Browse
replaces the list; the Field dialog SheetView tree lists sheet views with
their properties, scale formats and hyperlinks; drawings open in tabs get
.dwl/.dwl2 lock files that other instances read as open; the codec pin
moves to the revision with sheet views and the default output folder.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/app/update/file.rs

@@ -3308,6 +3308,10 @@ impl OpenCADStudio {
         for i in 0..self.tabs.len() {
             let _ = std::fs::remove_file(self.autosave_target(i));
         }
+        #[cfg(not(target_arch = "wasm32"))]
+        for path in &self.sheet_set.locks {
+            crate::app::commands::sheet_set::release_lock(path);
+        }
     }
 
     /// Remove the autosave recovery files, then quit the application.