feat: v2.7.8 — Artifacts hub, clone related repos as extra folders, quieter resume prompt

- Artifacts (/artifacts): claude.ai pages sessions publish (captured from the
  Artifact tool's hook), pinned workspace files, skills and plugins, each
  kept as a snapshot; shared ones appear in a Hub and a skill or plugin
  installs into the viewer's own account (server/lib/artifacts.js,
  /api/artifacts, docs/plans/artifacts/).
- Workspace extra folders: clone one or more related repos beside the
  workspace and add them in one step (POST /api/lanes/:id/sources/clone).
- A pane that ended by itself while tmux kept running is no longer offered
  for resume (tmux.serverStartedAt in reconcileOrphans).
- Changes panel: a folder that is not a git repo opens on Files, and its
  files open from there.
- Plus the parallel sessions' work in this tree: File Explorer button in the
  panel header, user delete, RSA SSH keys, chat/terminal and pet fixes.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

client/src/components/Sidebar.tsx

@@ -57,6 +57,7 @@ import {
   LayoutDashboard,
   FolderOpen,
   HardDrive,
+  Gem,
   BarChart3,
   Settings,
   Wifi,
@@ -91,6 +92,8 @@ const NAV_KEYS = [
   { to: "/sessions", icon: FolderOpen, key: "nav:sessions" },
   // The file manager (FilesPage): browse, upload and download workspace files.
   { to: "/files", icon: HardDrive, key: "nav:files" },
+  // What agents produced, and (server mode) the Hub others shared (Artifacts.tsx).
+  { to: "/artifacts", icon: Gem, key: "nav:artifacts" },
 ] as const;
 
 const STORAGE_KEY = "sidebar-collapsed";
@@ -197,7 +200,8 @@ export function Sidebar({
     location.pathname.startsWith("/settings") ||
     new URLSearchParams(location.search).has("settings");
   // Checking for (and applying) an update acts on the host: an admin's.
-  const canUpdate = usePermissions().isAdmin;
+  const perms = usePermissions();
+  const canUpdate = perms.isAdmin;
   const asideRef = useRef<HTMLElement>(null);
   const drawerOpen = Boolean(drawer?.open);
   useDialog(drawerOpen, asideRef, drawer?.onClose);
@@ -472,7 +476,8 @@ export function Sidebar({
       <div className="flex-1 min-h-0 relative flex">
         <nav ref={navRef} className="flex-1 overflow-y-auto overflow-x-hidden px-2 py-2 space-y-px">
           {[
-            ...NAV_KEYS,
+            // The file manager serves a shared server; locally it is the desktop's.
+            ...NAV_KEYS.filter((n) => !(perms.local && n.to === "/files")),
             // Server mode: the Users page, for an admin or analyst.
             ...(auth.state.mode === "server" &&
             auth.state.user &&