docs+web: surface @nexudotio X account in README + entry sidebar (#696)

* docs(readme): add @nexudotio X link + Stay in the loop section

- Add X/Twitter follow badge in the header next to Discord, so visitors
  can subscribe to release notes and milestone threads in one click.
- Add a short "Stay in the loop" section above "Star us" pointing to
  @nexudotio on X. Discord is for chat, X is for the public milestones
  (releases, new skills, new design systems).

No other changes.

* feat(web): add Follow @nexudotio pill to entry sidebar foot

- Surface the official X account next to the Settings/Pet/Language pills
  so users can subscribe to release notes from inside the app, not only
  the README.
- Uses the existing .foot-pill style (already supports <a>, has
  text-decoration: none) and the existing 'external-link' Icon — no new
  CSS, no new icons, no i18n key required (single short English label).
- Opens in a new tab with rel="noreferrer noopener".

Pairs with the README badge added in this same PR.

---------

Co-authored-by: Tuola-waj <ge@nexu.io>

README.md

@@ -24,6 +24,7 @@
   <a href="#design-systems"><img alt="Design systems" src="https://img.shields.io/badge/design%20systems-72-orange?style=flat-square" /></a>
   <a href="#skills"><img alt="Skills" src="https://img.shields.io/badge/skills-31-teal?style=flat-square" /></a>
   <a href="https://discord.gg/qhbcCH8Am4"><img alt="Discord" src="https://img.shields.io/badge/discord-join-5865F2?style=flat-square&logo=discord&logoColor=white" /></a>
+  <a href="https://x.com/nexudotio"><img alt="Follow @nexudotio on X" src="https://img.shields.io/badge/follow-%40nexudotio-1DA1F2?style=flat-square&logo=x&logoColor=white" /></a>
   <a href="QUICKSTART.md"><img alt="Quickstart" src="https://img.shields.io/badge/quickstart-3%20commands-green?style=flat-square" /></a>
 </p>
 
@@ -826,6 +827,10 @@ Phased delivery → [`docs/roadmap.md`](docs/roadmap.md).
 
 This is an early implementation — the closed loop (detect → pick skill + design system → chat → parse `<artifact>` → preview → save) runs end-to-end. The prompt stack and skill library are where most of the value lives, and they're stable. The component-level UI is shipping daily.
 
+## Stay in the loop
+
+Follow **[@nexudotio](https://x.com/nexudotio)** on X for release notes, new skills, new design systems, and the occasional behind-the-scenes thread on what's shipping next. Discord is for chat, X is for the milestones — both links are in the badges above.
+
 ## Star us
 
 <p align="center">

apps/web/src/components/EntryView.tsx

@@ -558,6 +558,17 @@ export function EntryView({
               {envMetaLine}
             </span>
           </button>
+          <a
+            className="foot-pill"
+            href="https://x.com/nexudotio"
+            target="_blank"
+            rel="noreferrer noopener"
+            title="Follow @nexudotio on X for releases and milestones"
+            aria-label="Follow @nexudotio on X"
+          >
+            <Icon name="external-link" size={12} />
+            <span>Follow @nexudotio</span>
+          </a>
           <LanguageMenu />
         </div>
         <button