feat: add system monitor feature with panel toggle and event handling
- Introduce SystemMonitor struct and typedef in dwn.h, add sysmon pointer to Monitor struct - Include sysmon.h in main.c, integrate sysmon_find_by_window and sysmon_set_client into map request handling - Add sysmon_render call in expose handler and sysmon_handle_event in button press and motion notify handlers - Implement clickable stats and top process areas in bottom panel to toggle system monitor via sysmon_toggle - Update build/main.d dependency file to include sysmon.h
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