Postpone reading/adding 3MF scene nodes until after the target machine/UCP is activated to ensure correct build volume and settings are applied. Adds a deferred filename field and stores the file during initial load, then reads and adds nodes in new _loadAndAddNodesToScene using AddSceneNodeOperation after activation. Fixes _updateActiveMachine calls to use the reader's is_ucp state, resets is_ucp only after nodes are added, and clears the deferred filename in _clearState. Also updates WorkspaceDialog and QML logic so machine selection/combobox visibility behave correctly for UCP files.
Replace generic Logger.log(...) calls with explicit Logger.error/warning/info/debug methods and standardize message formatting using f-strings. Also update Logger.logException call formatting for clarity. This is a stylistic refactor to make log severities and messages consistent across ThreeMFWorkspaceReader.py with no behavioral changes intended.
Delay active-machine switching and postpone applying materials/user settings until after machine activation so container/metadata signals can propagate. Removed the immediate _updateActiveMachine/_applyMaterials calls and replaced them with deferred callbacks using Application.getInstance().callLater: _finalizeMachineActivation -> _applyMaterialsAndFinalize for non-UCP flows, and _finalizeUcpActivation -> _applyUcpUserSettings for UCP flows. Adjusted _updateActiveMachine signature to accept is_ucp and moved containersChanged.emit to the deferred finalizers to ensure re-validation occurs after all changes are applied.
CURA-11905
Instead of using the object name for reloading meshes inside a 3MF file, use a dedicated mesh ID property that is only stored internally, doesn't have to be unique (because the combination filename+ID will be) and can't be changed by the user. This should improve 3MF file reloading, and also fixes reloading of duplicated instances, because multiple meshes can now have the same mesh ID.
Since we can't rely on the build-volume --because we can't know on which printer we open-- the safest bet (and the thing alowed by 3mf if I recall) is to just center the entire scene on the buildplate for Universal Cura Project files.
CURA-11703
Added a connection in WorkspaceDialog.qml to call function whenever the 'exportedSettingModel' changes. This ensures that any changes in the model will now be reflected in the UI table. Furthermore, an added adjustment in SpecificSettingsModel.py now correctly handles the enum type settings, retrieving the correct value from the options list.
CURA-11783
