feat: add coilToTikz electrical-schematic generator + topology mocks

[gpitel]

Summary

Adds assets/js/coilToTikz.js — a pure function that turns a MAS coil (functionalDescription / isolationSide / connections) into an electrical-schematic tikzpicture, plus assets/js/mockCoils.js with 8 topology fixtures. Two new files, no changes to existing code.

It groups windings by isolation side, draws each as a coil across the core, and renders every shared node (incl. Blind junctions) as a parallel vertical rail with junction dots. Output is plain TikZ (decorations.pathmorphing) that compiles through the backend's /process_latex_svg endpoint. Verified byte-identical to the MagneticDesigner schematic.py reference across all 8 topology mocks.

Examples — input MAS coil → rendered schematic

1. basic — primary + secondary, no blind connection

P  (primary)   connections: [Pin 1, Pin 2]
S  (secondary) connections: [Pin 3, Pin 4]

2. star_b1 — three primaries commoned at blind junction B1

P1 (primary)   [Pin 1, Blind B1]
P2 (primary)   [Pin 2, Blind B1]
P3 (primary)   [Pin 3, Blind B1]
S  (secondary) [Pin S1, Pin S2]

3. blind_chain — primaries in series via B1, B2 (parallel rails)

P1 (primary)   [Pin 1,    Blind B1]
P2 (primary)   [Blind B1, Blind B2]
P3 (primary)   [Blind B2, Pin 2]
S  (secondary) [Pin 3, Pin 4]

Notes

• Pure generator; no UI wiring (a summary-panel renderer can consume it separately).
• Cross-isolation-group shared nodes are annotated but not drawn as wires in v1 (noted inline in the TikZ).

🤖 Generated with Claude Code