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>

locales/ru-RU/opencadstudio.ftl

@@ -4396,6 +4396,8 @@ view =
     .ss-new-sheet-location = New sheet location
     .ss-remove-subset = Remove Subset
     .ss-rename-subset = Rename Subset...
+    .ss-layout-already-part = This layout is already part of a sheet set - not available for import.
+    .ss-layout-may-belong = Warning: this layout may belong to another sheet set.
     .ss-status-missing = missing
     .ss-status-open = open
     .ss-view-by-category = View by category
@@ -4416,7 +4418,6 @@ view =
     .ss-prefix-with-sheet-number = Prefix with sheet number
     .ss-rename-drawing-file-to-match = Rename drawing file to match:
     .ss-available-for-import = Available for import
-    .ss-belongs-to-sheet-set = Belongs to sheet set __ocs_fmt_0__
     .ss-drawings = Drawings
     .ss-select-drawing-files-containing-layouts = Select drawing files containing layouts
     .ss-browse-for-drawings = Browse for Drawings...