Add canard pusher aircraft icon (VELO, LGEZ, VEZE, COZY)

[evanrkeller]

What

Adds a canard marker shape — a top-view canard pusher silhouette (foreplane forward, swept main wing with winglets aft, pusher prop spinner) — and maps the common canard type designators to it in TypeDesignatorIcons:

• VELO (Velocity)
• LGEZ (Rutan Long-EZ)
• VEZE (Rutan VariEze)
• COZY (Cozy)

Why

These aircraft currently fall through to conventional shapes (or the category default) that don't resemble their planform at all. Canards are common in the experimental/homebuilt fleet, and the reversed configuration is distinctive enough that the generic single-prop silhouette reads wrong on the map.

Notes

• Follows the existing marker conventions: cls-1 fill path + cls-2 outline path, add_stroke_selected, aircraft_color_fill/aircraft_color_stroke placeholders, alphabetical placement in shapes and TypeDesignatorIcons.
• Proportions are drawn from the Velocity's published planform (~31 ft span vs ~20 ft length).
• License: this is original artwork created for this contribution (not derived from any existing icon set). I am happy to contribute it under the BSD 2-Clause license, consistent with the provenance of the existing markers, or under GPL v2+ with the rest of the project — whichever the maintainers prefer.

Preview (rendered with placeholder colors substituted):
the shape renders correctly with both the fill and outline paths layered, verified in-browser and via the same color-substitution pipeline markers.js uses.