In DNA+delta combo mode the tooltip's no-band fallback read
tip.total over the delta record, whose total IS the churn —
the label claimed a total while the figure was the change
magnitude (and a zero-churn bar showed 'Total ≈ 0' anywhere).
The band lookup now sits ahead of the mode branches: a hover
with no band under the pointer falls through to the mode's own
row — the shared delta row (fmtSigned of the net) in delta
modes, the total row otherwise. The delta branch reuses
fmtSigned instead of its inline sign formatting.
bowenliang123
811bb14957