fix: changelog page rendered literal **bold** markup instead of bold text

Entries are plain strings with occasional **bold**/`code` spans, never
full markdown — added a tiny inline parser rather than pulling in
react-markdown just for this.

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

apps/web/lib/changelog.ts

@@ -1,5 +1,5 @@
 // Mirrors CHANGELOG.md at the repo root — update both together.
-export const APP_VERSION = "0.12.0";
+export const APP_VERSION = "0.12.1";
 
 export type ChangelogEntry = {
   version: string;
@@ -11,6 +11,13 @@ export type ChangelogEntry = {
 };
 
 export const CHANGELOG: ChangelogEntry[] = [
+  {
+    version: "0.12.1",
+    date: "2026-07-13 13:25",
+    fixed: [
+      "Changelog entries showed literal `**bold**` markup instead of rendering it.",
+    ],
+  },
   {
     version: "0.12.0",
     date: "2026-07-13 12:52",