Add SVG child elements (path, circle, rect, etc.) to HTML_TAGS

Fixes EvalError: Undefined symbol: path when rendering ~mobile-filter
component which uses an SVG <path> element.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

shared/sexp/html.py

@@ -74,6 +74,12 @@ HTML_TAGS = frozenset({
     "img", "picture", "source", "iframe", "embed", "object", "param",
     "video", "audio", "track", "canvas", "map", "area",
     "svg", "math",
+    # SVG child elements
+    "path", "circle", "ellipse", "line", "polygon", "polyline", "rect",
+    "g", "defs", "use", "text", "tspan", "clipPath", "mask",
+    "linearGradient", "radialGradient", "stop", "filter",
+    "feGaussianBlur", "feOffset", "feMerge", "feMergeNode",
+    "animate", "animateTransform",
     # Table
     "table", "thead", "tbody", "tfoot", "tr", "th", "td",
     "caption", "colgroup", "col",