feat(logic): doc + example for invert-style

Author: weiserhase

docs/main.typ

@@ -1218,6 +1218,8 @@ The `diode` symbol accepts only one parameter, called `type`, and its appearance
 
 == Logic <logic>
 
+Use `set-style(logic: (invert-style: "circle"))` to render IEC inversion bubbles (European-style) on inverted logic gates.
+
 #circ(
     ```typst
     #import "./zap.typ"

examples/example-inverter-style.typ

@@ -0,0 +1,28 @@
+#import "/src/lib.typ"
+#set page(width: auto, height: auto, margin: 5pt, fill: white)
+
+#lib.circuit({
+    import lib: *
+
+    set-style(logic: (invert-style: "circle"))
+
+    lnot("g1", (0, 1.3))
+    lnand("g2", (6, 1.3))
+    lnor("g3", (0, -1.3))
+    lxnor("g4", (6, -1.3))
+
+    wstub("g1.in1", label: "A")
+    estub("g1.out", label: "NOT")
+
+    wstub("g2.in1", label: "B")
+    wstub("g2.in2", label: "C")
+    estub("g2.out", label: "NAND")
+
+    wstub("g3.in1", label: "D")
+    wstub("g3.in2", label: "E")
+    estub("g3.out", label: "NOR")
+
+    wstub("g4.in1", label: "F")
+    wstub("g4.in2", label: "G")
+    estub("g4.out", label: "XNOR")
+})