UI fixes, ZTools-PartDesign merge, Silo enhancements, and BOM integration

Stylesheet fixes (KindredCreate theme):
- Add tree branch expand/collapse SVG indicators (branch_closed.svg,
  branch_open.svg) visible on dark background
- Add QSS rules for QTreeView::branch pseudo-states
- Add min-height: 20px to QHeaderView::section to fix bottom clipping
- Merge QDockWidget::title and QSint--ActionGroup QToolButton padding
  improvements from Stylesheets copy into canonical
- Add SpreadsheetGui--SheetTableView QLineEdit cell editor styling
- Sync all three QSS copies (resources/preferences, src/Gui/Stylesheets,
  src/Gui/PreferencePacks) to canonical version

ZTools-PartDesign workbench integration:
- Add _ZToolsPartDesignManipulator via WorkbenchManipulator API
- Injects DatumCreator, DatumManager into Part Design Helper Features toolbar
- Injects EnhancedPocket into Part Design Modeling Features toolbar
- Injects RotatedLinearPattern into Part Design Transformation Features toolbar
- Adds corresponding PartDesign menu entries after PartDesign_Boolean

Silo enhancements:
- Add Silo_ToggleMode command: toggle switch in File toolbar that swaps
  Ctrl+O/S/N between standard FreeCAD and Silo equivalents
- Add SSL certificate file browser in Silo Settings dialog (SslCertPath
  preference, supports .pem/.crt/.cer)
- Update _get_ssl_context() to load custom CA cert before system CAs
- Expand SiloMenuManipulator: Silo_New, Silo_Open, Silo_Save, Silo_Commit,
  Silo_Pull, Silo_Push, Silo_BOM in File menu
- Integrate upstream Silo_BOM command (tabbed BOM/Where-Used dialog)

Submodule updates:
- silo: Silo mode toggle, SSL cert browsing, BOM menu integration
- ztools: PartDesign WorkbenchManipulator and Catppuccin theme sync

Documentation:
- Add docs/REPOSITORY_STATE.md: comprehensive repository state report with
  architecture overview, submodule status, potential issues, feature stubs,
  and Silo integration path forward

src/Mod/Create/InitGui.py

@@ -66,15 +66,24 @@ def _check_silo_first_start():
 
 
 def _setup_silo_menu():
-    """Inject Silo commands into the File menu across all workbenches."""
+    """Inject Silo commands into the File menu and toolbar across all workbenches."""
     try:
 
         class SiloMenuManipulator:
             def modifyMenuBar(self):
                 return [
+                    {"insert": "Silo_New", "menuItem": "Std_New", "after": ""},
                     {"insert": "Silo_Open", "menuItem": "Std_Open", "after": ""},
                     {"insert": "Silo_Save", "menuItem": "Std_Save", "after": ""},
-                    {"insert": "Silo_Commit", "menuItem": "Std_Save", "after": ""},
+                    {"insert": "Silo_Commit", "menuItem": "Silo_Save", "after": ""},
+                    {"insert": "Silo_Pull", "menuItem": "Silo_Commit", "after": ""},
+                    {"insert": "Silo_Push", "menuItem": "Silo_Pull", "after": ""},
+                    {"insert": "Silo_BOM", "menuItem": "Silo_Push", "after": ""},
+                ]
+
+            def modifyToolBars(self):
+                return [
+                    {"append": "Silo_ToggleMode", "toolBar": "File"},
                 ]
 
         FreeCADGui.addWorkbenchManipulator(SiloMenuManipulator())