M4.19: SVG text import fidelity — text keeps its place, group, clip and mask; textPath, per-character positions, weights, spacing, paints and CSS selectors survive

Each <text> is swapped for a placeholder group before usvg runs, so the text keeps its z-order,
parent group, clip, mask, opacity, link and <use> instances, and usvg resolves its gradient and
pattern paints (in text space). <textPath> becomes type on a path (startOffset, side, anchor),
vertical writing-mode type on a vertical path. Per-character x/y/dx/dy/rotate lists become line
breaks (bounded), kerning (absolute x measured against the layout), baseline shift and rotation;
baseline-shift, numeric and relative weights (style names), letter/word spacing, kerning and the
character stroke's cap, join, miter and dashes are kept. The style cascade supports type, #id,
multiple-class, attribute, descendant and child selectors with !important and specificity.
<pattern> paints become pattern swatches. The import fuzz covers the new attributes and CSS.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

crates/engine/tests/import_fuzz.rs

@@ -117,6 +117,14 @@ fn arb_svg_attr() -> impl Strategy<Value = String> {
         "mask-type",
         "data-vectorcraft-mask",
         "href",
+        "baseline-shift",
+        "word-spacing",
+        "kerning",
+        "writing-mode",
+        "font-weight",
+        "text-anchor",
+        "side",
+        "path",
     ]);
     let value = prop_oneof![
         arb_num(),
@@ -203,6 +211,19 @@ proptest! {
         survive(&svg, || vectorcraft_svg::import(&svg).ok())?;
     }
 
+    #[test]
+    fn svg_hostile_css_never_panics(
+        sheet in r#"[a-z#.>*\[\]=:;{}@ !"'/,-]{0,160}"#,
+        decls in r#"[a-z0-9.%: ;!-]{0,60}"#,
+        body in prop::collection::vec(arb_svg_element(1), 0..3),
+    ) {
+        let svg = format!(
+            "<svg xmlns=\"http://www.w3.org/2000/svg\"><style>{sheet}</style><g class=\"a b\"><text id=\"t\" class=\"a\" x=\"1 2 3\" y=\"9\" rotate=\"5\" style=\"{decls}\">ab<tspan dy=\"3\">c</tspan></text></g>{}</svg>",
+            body.concat()
+        );
+        survive(&svg, || vectorcraft_svg::import(&svg).ok())?;
+    }
+
     #[test]
     fn svg_mutated_export_never_panics(
         cut in 0usize..20_000,