Add Nemo File Manager Integration Design

[bcherrington]

Description

Add design details for Nemo extension and icon integration to display file status in the Nemo file manager.

Rationale

Users need visual indicators of file status in their file manager for better workflow integration.

Impact

Medium - Would improve user experience and workflow integration with the desktop environment.

Relevant Documentation

• Requirements: FR-INT-004, FR-INT-005
• Architecture: SAS 3.2.6 (Key Abstractions - FileManagerIntegration)
• Design: Partially implemented through D-Bus interface
• Implementation: nemo-onedriver/src/nemo-onedriver.c, ui/dbus.go

Implementation Notes

• Design Nemo extension architecture
• Create icon mapping for different file statuses
• Implement D-Bus client in Nemo extension
• Add status update mechanisms
• Design configuration options for icon display
• Implement performance optimizations for status updates