Three additions to the surface_validate drawer block:
1. **Phase caption** below the meters: "Pattern 2 of 4 · Verify 0x55
· 47% within phase". Pure JS — no schema change. Makes the
visual grammar explicit without needing the operator to mentally
map phase=4 to "verifying pattern 2".
2. **Bad-block badge** in the vitals row. Green at 0, red at >0.
The number was already on the stage row but burying it in the
log felt wrong — surfacing it next to temp/speed/ETA keeps it
in eye-line during long runs.
3. **Per-pattern duration history** below the caption. New
bb_phase_history JSON column (idempotent migration) maps
{phase_num: ts}. Parser stamps the timestamp on every phase
transition (and on stage entry for phase 1). Drawer diffs
consecutive write-phase starts to derive "0xaa: 14h 22m"
for completed patterns. Once one pattern is done you can
predict the rest without leaving the drawer.
Persistence is idempotent: re-entry of the same phase keeps the
original timestamp so a transient parser reset doesn't blow away
history. JSON parse failures fail gracefully (no row rendered).
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