Description
Fill the System page with more psutil metrics (syswatch-inspired, no new deps/sudo): per-core CPU bars (new Cores panel beside CPU-history sparkline), swap in Memory panel, disk read/write throughput in the Network panel (retitled Network + Disk I/O), process/thread/running/sleeping counts in CPU panel, and a second Top-by-Memory process table. Temps/fans/GPU skipped (need a helper).
Acceptance Criteria
- #1 Per-core bars, swap, disk I/O, proc/thread counts, top-mem table all render