Fix the fan-dipole build sheet cut list and geometry sketch

[skip17331]

Bugs (reported)

For a 40/20/15/10 m fan dipole:

1. Cut list — effectively only the lowest band looked real. The generic by-length cut list listed unlabelled half-wires ("Wire 1–4", qty 2 each, at half the true length) plus a phantom 0.5 m wire (the feed-bridge modelling artifact), with no band shown — so a builder couldn't tell which wire belonged to which band.
2. Sketch — the geometry drew as an overlapping, mirrored star ("longest-to-shortest on the left, shortest-to-longest on the right"). That's the raw NEC geometry (legs fanned ±15° in azimuth, each split across a feed gap) projected to a plan view — correct for the solver, useless as a builder's drawing.

Both stem from the build sheet/sketch reading the raw deck instead of the model.

Fix (both fan-dipole-specific; every other antenna untouched)

• Cut list (results/buildsheet.py) — built from model.legs: one full-length wire per band, labelled with its frequency (e.g. "Dipole leg for 14.175 MHz"), quantity 1, no phantom bridge.
• Sketch (results/sketch.py) — a builder's schematic: the legs drawn to scale as parallel dipoles, longest at the top, each labelled with its band, tied together at a shared centre feedpoint.

Before → after (cut list, 40/20/15/10)

Wire 1  qty 2  9.958 m       Dipole leg for 7.150 MHz   qty 1  20.51 m
Wire 2  qty 2  5.023 m   →   Dipole leg for 14.175 MHz  qty 1  10.35 m
Wire 3  qty 2  3.355 m       Dipole leg for 21.225 MHz  qty 1   6.91 m
Wire 4  qty 2  2.498 m       Dipole leg for 28.500 MHz  qty 1   5.15 m
Wire 5  qty 1  0.500 m  (phantom feed bridge — gone)

Tests

tests/test_fan_dipole.py (+2): the cut list has one labelled, full-length entry per leg with no phantom bridge; the sketch draws one labelled wire per leg with the shared-feed schematic. Verified the build sheet still renders to Markdown and HTML (SVG embedded) for a fan dipole. Suite 512 → 514, green locally.

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