fix(design-requirements): label per-winding rows 'WND<n>'

[gpitel]

Problem

In the Design Requirements Isolation Sides editor, the left column shows each winding's ordinal name (Primary, Secondary, …), while its dropdown lists the isolation-side tag (also Primary, Secondary, …). With the same vocabulary in both columns, a row reads like a contradiction — e.g. "Secondary → Primary."

Fix

Label the left column WND1 / WND2 / … so it plainly identifies which winding the row is for; the dropdown still names the isolation group. A row now reads "WND2 → Primary" (winding 2 is on the primary side).

-                :replaceTitle="isolationSideOrdered[requirementIndex - 1]"
+                :replaceTitle="'WND' + requirementIndex"

Pure display change — the stored winding name and the isolationSide enum are untouched. Scoped to the Isolation Sides rows (the only ArrayElementFromList consumer); also drops the now-unused isolationSideOrdered import.

Before / After

Before — left column repeats the isolation-group vocabulary:

After — left column identifies the winding as WND1 / WND2 / …:

ℹ️ The "after" image above captures an earlier Winding <n> iteration of this label; the current code renders the compact WND<n> form. Screenshot pending refresh.