Add blog post: My Favorite Feature: Cmd+Shift+U (#852)

* Add blog post about Cmd+Shift+U (Jump to Latest Unread)

* Rewrite blog post to remove AI rhetorical patterns

* Add video, trim post to two paragraphs

web/app/blog/cmd-shift-u/page.tsx

@@ -0,0 +1,80 @@
+import type { Metadata } from "next";
+import Link from "next/link";
+
+export const metadata: Metadata = {
+  title: "Cmd+Shift+U",
+  description:
+    "How Cmd+Shift+U navigates between finished agents across workspaces in cmux.",
+  keywords: [
+    "cmux",
+    "terminal",
+    "macOS",
+    "notifications",
+    "AI coding agents",
+    "keyboard shortcuts",
+    "developer tools",
+    "workflow",
+  ],
+  openGraph: {
+    title: "Cmd+Shift+U",
+    description:
+      "How Cmd+Shift+U navigates between finished agents across workspaces in cmux.",
+    type: "article",
+    publishedTime: "2026-03-04T00:00:00Z",
+    url: "https://cmux.dev/blog/cmd-shift-u",
+  },
+  twitter: {
+    card: "summary",
+    title: "Cmd+Shift+U",
+    description:
+      "How Cmd+Shift+U navigates between finished agents across workspaces in cmux.",
+  },
+  alternates: {
+    canonical: "https://cmux.dev/blog/cmd-shift-u",
+  },
+};
+
+export default function CmdShiftUPage() {
+  return (
+    <>
+      <div className="mb-8">
+        <Link
+          href="/blog"
+          className="text-sm text-muted hover:text-foreground transition-colors"
+        >
+          &larr; Back to blog
+        </Link>
+      </div>
+
+      <h1>Cmd+Shift+U</h1>
+      <time dateTime="2026-03-04" className="text-sm text-muted">
+        March 4, 2026
+      </time>
+
+      <p className="mt-6">
+        My favorite cmux feature is <kbd>Cmd+Shift+U</kbd>. I have 17
+        workspaces open right now, each running an agent. I used to click
+        through tabs and the notification panel to figure out what completed.
+        Typing is faster.
+      </p>
+
+      <video
+        src="/blog/cmd-shift-u.mp4"
+        autoPlay
+        loop
+        muted
+        playsInline
+        className="my-6 rounded-lg w-full"
+      />
+
+      <p>
+        <kbd>Cmd+Shift+U</kbd> jumps to the newest unread{" "}
+        <Link href="/docs/notifications">notification</Link>. In practice
+        that means the last agent that finished. It switches to the right
+        workspace, focuses the exact pane, flashes it so you see where to
+        look, and marks it read. If the notification came from another window,
+        that window comes forward.
+      </p>
+    </>
+  );
+}

web/app/blog/page.tsx

@@ -7,6 +7,13 @@ export const metadata: Metadata = {
 };
 
 const posts = [
+  {
+    slug: "cmd-shift-u",
+    title: "Cmd+Shift+U",
+    date: "2026-03-04",
+    summary:
+      "How Cmd+Shift+U navigates between finished agents across workspaces in cmux.",
+  },
   {
     slug: "zen-of-cmux",
     title: "The Zen of cmux",