refactor(topology): Update Segment reference_coordinates to SVector of Vec

- Changed Segment{2}: tuple of tuples → SVector of Vec{1,Float64}
- Changed Segment{3}: tuple of tuples → SVector of Vec{1,Float64}
- Both now return SVector(Vec{1}(...), Vec{1}(...), ...) format

src/topology/segments.jl

@@ -19,11 +19,18 @@ nnodes(::Segment{N}) where {N} = N
 dim(::Segment{N}) where {N} = 1
 
 function reference_coordinates(::Segment{2})
-    return ((-1.0,), (1.0,))
+    return SVector(
+        Vec{1,Float64}((-1.0,)),
+        Vec{1,Float64}((1.0,))
+    )
 end
 
 function reference_coordinates(::Segment{3})
-    return ((-1.0,), (1.0,), (0.0,))
+    return SVector(
+        Vec{1,Float64}((-1.0,)),
+        Vec{1,Float64}((1.0,)),
+        Vec{1,Float64}((0.0,))
+    )
 end
 
 function edges(::Segment{N}) where {N}