Disks tab: lsblk devices with partitions/usage/live IO, SMART via smartctl (standby-aware, self-tests, install button), ZFS pools/datasets/snapshots with scrub and snapshot-now

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

PLAN.md

@@ -148,9 +148,20 @@ something long in one, switch away and back, refresh — it's all still there.
   with `crontab -`, system files written via `sudo tee`), Cron log, and Output file
   when the command redirects to one. Timers: Run now (starts the activated service),
   start/stop/enable/disable, live logs of the service via the Services tab's tail.
-- **ZFS tab** — pools, datasets (`used/avail/refer/usedbysnapshots`), snapshot list,
-  scrub status, and the `freeing` counter. `grid` is the target, which implies
-  multi-host.
+- **Disks tab** — **shipped 2026-09-17** (`internal/storage`, `Disks.tsx`), replacing
+  the planned ZFS tab: block devices from `lsblk -J` (kind, model, size, temperature
+  from the device's hwmon node, partitions with filesystem usage, live read/write/busy
+  from the metrics sampler); SMART via `smartctl -j` when smartmontools is present (one
+  button installs it as a task otherwise): health, temperature, power-on time, self-test
+  status, ATA attribute table with the failure-predicting IDs flagged, NVMe endurance and
+  error counters, short/long self-tests. Spinning disks are read with `-n standby` so
+  the tab never wakes a sleeping drive; "Wake and read" is explicit. ZFS section when
+  the tools and module are there: pools with health, capacity, fragmentation, last scan
+  and vdev tree; scrub start/pause/stop; datasets tree with used/refer/in-snapshots/
+  snapshot count/compressratio/mount; per-dataset snapshot list and "Snapshot now".
+  Verified against `grid` (raidz2 `tank`, 10 datasets, 515 snapshots, 8 WD40EZAZ + 970
+  EVO Plus SMART). Snapshot destroy and dataset property editing are deliberately not
+  there yet.
 - **Dashboard** — **first cut shipped 2026-09-17** (`internal/metrics`, `Dashboard.tsx`):
   CPU (total + per core), memory/swap, load, uptime, hwmon temps and fans read straight
   from `/sys` (no lm-sensors), per-interface network rates, per-disk read/write/busy