Rollup merge of rust-lang#129284 - notriddle:notriddle/animate-target=light, r=GuillaumeGomez

rustdoc: animate the `:target` highlight

This approach is, roughly, based on how Discourse does it. It came up while discussing [some other possible sidebar changes](https://rust-lang.zulipchat.com/#narrow/stream/266220-t-rustdoc/topic/Moving.20deprecated.20items.20out.20of.20the.20way), as a design that made rapid scanning easier while avoiding the inherent trade-offs in summarizing.

https://github.com/user-attachments/assets/f7a8fec3-70a5-40a1-92ea-bfdffbd61c22

Author: tgross35

src/librustdoc/html/static/css/rustdoc.css

@@ -1547,10 +1547,23 @@ instead, we check that it's not a "finger" cursor.
 	margin-left: 24px;
 }
 
+@keyframes targetfadein {
+	from {
+		background-color: var(--main-background-color);
+	}
+	10% {
+		background-color: var(--target-border-color);
+	}
+	to {
+		background-color: var(--target-background-color);
+	}
+}
+
 :target {
 	padding-right: 3px;
 	background-color: var(--target-background-color);
 	border-right: 3px solid var(--target-border-color);
+	animation: 0.65s cubic-bezier(0, 0, 0.1, 1.0) 0.1s targetfadein;
 }
 
 .code-header a.tooltip {

tests/rustdoc-gui/target.goml

@@ -11,7 +11,7 @@ define-function: (
     [theme, background, border],
     block {
         call-function: ("switch-theme", {"theme": |theme|})
-        assert-css: ("#method\.a_method:target", {
+        wait-for-css: ("#method\.a_method:target", {
             "background-color": |background|,
             "border-right": "3px solid " + |border|,
         })