Extract search-and-open UI into OpenItemWidget (open_search.py), a
plain QWidget with item_selected/cancelled signals. Silo_Open now
adds this widget as an MDI subwindow instead of running a blocking
QDialog, matching the Silo_New tab pattern.
Improvements over the old dialog:
- Non-blocking: multiple search tabs can be open simultaneously
- 500 ms debounce on search input reduces API load
- Filter checkbox changes trigger immediate re-search
Extract SchemaFormWidget from SchemaFormDialog so the creation form
can be embedded as a plain QWidget in an MDI subwindow tab. Each
Ctrl+N invocation opens a new tab alongside document tabs. On
successful creation the pre-document tab closes and the real document
opens in its place.
- SchemaFormWidget emits item_created/cancelled signals
- SchemaFormDialog preserved as thin modal wrapper for backward compat
- Inline error display replaces modal QMessageBox
- Live tab title updates from part number preview
Add 'Silo Origin' toolbar (Commit/Pull/Push/Info/BOM) registered with
Unavailable visibility. Register a Silo overlay via
FreeCADGui.registerEditingOverlay() that appends this toolbar to any
active editing context when the current document is Silo-tracked
(ownsDocument() returns True).
Consolidate PySide.QtCore imports.
