Issue #10: Local filesystem origin implementation - Add openDocumentInteractive() method to FileOrigin interface for UI-based file opening (shows file dialog) - Add saveDocumentAsInteractive() method for UI-based save as - Implement LocalFileOrigin::openDocumentInteractive() with full file dialog support, filter list building, and module handler integration - Implement LocalFileOrigin::saveDocumentAsInteractive() delegating to Gui::Document::saveAs() Issue #12: Modify Std_* commands to delegate to current origin - StdCmdNew::activated() now delegates to origin->newDocument() and sets up view orientation for the new document - StdCmdOpen::activated() delegates to origin->openDocumentInteractive() with connection state checking for authenticated origins - StdCmdSave::activated() uses document's owning origin (via findOwningOrigin) for save, falling back to saveDocumentAsInteractive if no filename - StdCmdSaveAs::activated() delegates to origin->saveDocumentAsInteractive() - Updated isActive() methods to check for active document The Std_* commands now work seamlessly with both LocalFileOrigin and SiloOrigin. When Local origin is selected, standard file dialogs appear. When Silo origin is selected, Silo's search/creation dialogs appear. Import and Export commands are left unchanged as they operate on document content rather than document lifecycle. Closes #10, Closes #12
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