fix(presentation): tweak midas slides

presentation/sections/03_midas.typ

@@ -404,8 +404,8 @@ Steps:
     row-gutter: 1em,
     [AST], none, none,
     text(size: 2em)[+],
-    text(size: 2em)[$stretch(->)^#{set text(size: 0.6em);```py ast.unparse(tree)```}$],
-    [Code],
+    uncover("2-", text(size: 2em)[$stretch(->)^#{set text(size: 0.6em);```py ast.unparse(tree)```}$]),
+    uncover("2-")[Code],
     [Typing\ Judgements],
   )
 )
@@ -453,7 +453,6 @@ Steps:
           def __truediv__: fn(float, /) -> Meter
       }
       ```
-
     - Dependent Types (i.e. with value constraints)
       ```midas
       predicate in_range(mn: float, mx: float)(v: float) = mn <= v & v <= mx
@@ -533,6 +532,8 @@ Generates runtime checks
 mean_height = df["height"].mean()
 ```
 
+#pause
+
 #figure(
   align(
     left + top,
@@ -565,12 +566,10 @@ $
   overline(x) = 1 / n sum_(i=0)^n x_i
 $
 
-#alternatives[
+#pause
+
 $
-    "type_of"(overline(x)) = "type_of"( ("type_of"(x) + "type_of"(x)) / "int" )
+  "type_of"(overline(x)) &= "type_of"( ("type_of"(x) + "type_of"(x)) / "type_of"(n) )\
+  pause
+  &= "type_of"( ("Meter" + "Meter") / "int") pause = "Meter"
 $
-][
-  $
-    "type_of"(overline(x)) = "type_of"( ("Meter" + "Meter") / "int") = "Meter"
-  $
-]