chore(summary): drop decorative per-step icons in Winding Construction Steps & Termination

[gpitel]

What

Removes the decorative per-row icons from the Winding Construction Steps and Winding Termination sections of the magnetic summary/datasheet (MagneticSummary.vue). They repeated the same glyph on every row and added nothing beyond the text label.

Removed:

• The per-step leading icons: fa-rotate / fa-tape (construction) and fa-plug (termination).
• The fa-shield-halved glyph inside the Primary/Secondary isolation badge (the text label stays).
• The now-unused icon fields on the windingConstructionSteps / windingTerminations step objects, plus the .step-icon styles (including the print-stylesheet rule).

Kept (unchanged):

• The numbered step badge, the step description, and the isolation-side text (Primary / Secondary).
• The section-header icons (fa-list-check, fa-plug), so these sections stay visually consistent with every other section of the datasheet.

Before / after (a construction row)

Before:  [1]  (wind icon)  Wind 1-2: 24 turns                 [shield] Primary
After:   [1]  Wind 1-2: 24 turns                                       Primary

Notes

• Net change is +2 / −29 lines, confined to MagneticSummary.vue.
• The file has pre-existing mixed CRLF/LF line endings; the edit was applied at the byte level so only the icon lines change — no line-ending churn in the diff.
• Verified statically: no remaining references to step.icon / .step-icon / fa-shield-halved, and the affected object literals/template/CSS remain well-formed. Not exercised in a running dev server (the running instance is on a different branch); happy to capture a live screenshot if useful.