Clickable headers on Drive / Serial / Size / Temp / Health / Short
SMART / Long SMART / Burn-In. Click cycles asc → desc → cleared,
with a small ▲/▼ indicator next to the active column.
Sort state lives in localStorage so it survives reload AND every
SSE-driven tbody refresh (HTMX swaps `#drives-table-wrap` innerHTML
on each `drives-update` event). The htmx:afterSwap hook re-applies
the sort and re-paints indicators.
Sortable values are emitted as data-sort-* attributes on each <tr>:
- raw devname / serial / size_bytes / temperature_c
- numeric priority maps for SMART health, SMART test states, and
burn-in state (so "running" sorts ahead of "passed" regardless
of alphabetical order)
Empty values always sink to the bottom regardless of direction so
"sort by temp asc" doesn't put a missing-temp drive on top.
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