KEY_UP/KEY_DOWN pauses entire program instead of only process list

[riteshdhurwey]

Description:
When navigating the process list using KEY_UP or KEY_DOWN, the entire
program pauses including CPU and network stats instead of only pausing
the process list refresh.

Expected behavior:

• Process list pauses while navigating
• CPU, memory, network stats continue updating normally

Actual behavior:

• Entire program freezes on key press
• CPU, network, disk stats stop updating

Root cause:

• paused = true stops all updates not just process list refresh

To reproduce:

1. Run sysmon
2. Press KEY_UP or KEY_DOWN
3. Observe CPU and network stats freeze