feat(app): add Beta pill to sidebar header

Author: RhysSullivan

.changeset/sidebar-beta-label.md

@@ -0,0 +1,6 @@
+---
+"executor": patch
+"@executor-js/desktop": patch
+---
+
+Add a "Beta" label next to the executor wordmark in the sidebar header (desktop and local apps).

apps/cli/release-notes/next.md

@@ -10,3 +10,7 @@ The CLI's web UI now ships as a native desktop app. Same gateway, same UI, same
 - Linux: AppImage / deb / rpm for x64 and arm64. Windows: `.exe` (currently unsigned — code-signing pipeline in flight).
 
 Downloads land on each [GitHub release](https://github.com/RhysSullivan/executor/releases/latest) under the `executor-desktop-*` assets.
+
+## UI
+
+- Sidebar now shows a "Beta" pill next to the executor wordmark.

packages/app/src/web/shell.tsx

@@ -354,6 +354,9 @@ function SidebarContent(props: {
         <div className="flex h-12 shrink-0 items-center border-b border-sidebar-border px-4">
           <Link to="/" className="flex items-center gap-1.5">
             <span className="font-display text-base tracking-tight text-foreground">executor</span>
+            <span className="rounded bg-primary/15 px-1.5 py-px text-[10px] font-semibold uppercase tracking-wider text-primary">
+              Beta
+            </span>
           </Link>
         </div>
       )}
@@ -489,6 +492,9 @@ export function Shell() {
                 <span className="font-display text-base tracking-tight text-foreground">
                   executor
                 </span>
+                <span className="rounded bg-primary/15 px-1.5 py-px text-[10px] font-semibold uppercase tracking-wider text-primary">
+                  Beta
+                </span>
               </Link>
               <Button
                 variant="ghost"