feat: add indexmap dependency

Cargo.lock

@@ -1869,6 +1869,8 @@ checksum = "7714e70437a7dc3ac8eb7e6f8df75fd8eb422675fc7678aff7364301092b1017"
 dependencies = [
  "equivalent",
  "hashbrown 0.16.1",
+ "serde",
+ "serde_core",
 ]
 
 [[package]]
@@ -3026,6 +3028,7 @@ dependencies = [
  "chrono",
  "console_error_panic_hook",
  "icondata",
+ "indexmap",
  "leptos",
  "leptos_animate",
  "leptos_axum",