Dock: floating groups, floating title bar menu, translations

- A docked group floats as one window: drag its edge band over the
  drawing or double-click the band. Floating windows hold a stack of
  pallets with splitters; the vertical title bar shows each pallet's
  icon (press one to drag that pallet out). Dragging the bar moves the
  whole window; dropping it on an edge docks or joins it as a group.
- Right-click a floating title bar: Pallets submenu (add or hide
  pallets in the window), Dock left, Dock right.
- Close on a floating bar closes every pallet in the window; its pin
  sets auto-hide for the whole window.
- Older configs with single floating pallets still load.
- Translate the new dock texts (Auto-hide, Dock left/right, New group,
  Pallets, Browser, Node Graph) in all 21 languages.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_013RyGiMXcsf9HTKfqDxaQGt

locales/pl-PL/opencadstudio.ftl

@@ -6151,3 +6151,12 @@ count-feature =
     .invalid-boundary = Nieprawidłowy obiekt obwiedni obszaru liczenia. Wybierz zamkniętą polilinię złożoną z odcinków, która nie przecina samej siebie.
     .block-not-found = Nie można znaleźć bloku "__ocs_fmt_0__".
     .invalid-point = Nieprawidłowy punkt.
+
+dock =
+    .auto-hide = Autoukrywanie
+    .dock-left = Zadokuj po lewej
+    .dock-right = Zadokuj po prawej
+    .new-group = Nowa grupa
+    .pallets = Palety
+    .browser = Przeglądarka
+    .node-graph = Graf węzłów