fix: prefer toolchain-provided linker to embed web-ui assets

Signed-off-by: Attila Oláh <attila@dorn.haus>

scripts/embed-frontend.sh

@@ -72,7 +72,7 @@ for file in "${FILES[@]}"; do
     if $IS_LINUX; then
         # Linux: ld -r -b binary (zero bloat, ELF only)
         abs_obj="$(cd "$(dirname "$0")/.." && pwd)/$obj"
-        (cd "$DIST_DIR" && ld -r -b binary -o "$abs_obj" "$rel")
+        (cd "$DIST_DIR" && "${LD:-ld}" -r -b binary -o "$abs_obj" "$rel")
     else
         # macOS/Windows/MSYS2: generate C byte array + cc (no xxd dependency)
         local_c="$OUTPUT_DIR/embed_${mangled}.c"