Descriptions are inline markdown; Feature.link withdrawn

Alternative and feature descriptions render links, emphasis and code
(pulldown-cmark, html feature only). Block structure flattens to one
paragraph, raw HTML is dropped, link targets are limited to https,
mailto and site-relative paths. A link belongs in the prose, so the
title-link field shipped in 0.3.7 goes before anyone uses it.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

Cargo.lock

@@ -2970,6 +2970,7 @@ dependencies = [
  "leptos_router",
  "openidconnect",
  "proptest",
+ "pulldown-cmark",
  "serde",
  "serde_json",
  "serde_yaml",
@@ -3104,6 +3105,24 @@ dependencies = [
  "unarray",
 ]
 
+[[package]]
+name = "pulldown-cmark"
+version = "0.13.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e9f068eba8e7071c5f9511831b44f32c740d5adf574e990f946ddb53db2f314e"
+dependencies = [
+ "bitflags 2.13.1",
+ "memchr",
+ "pulldown-cmark-escape",
+ "unicase",
+]
+
+[[package]]
+name = "pulldown-cmark-escape"
+version = "0.11.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "007d8adb5ddab6f8e3f491ac63566a7d5002cc7ed73901f72057943fa71ae1ae"
+
 [[package]]
 name = "quick-error"
 version = "1.2.3"