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/run/TerminalView.tsx

@@ -406,6 +406,16 @@ export const TerminalView = memo(function TerminalView({
           }, 0);
           return false;
         }
+        // Ctrl+Z: a terminal sends ^Z (SIGTSTP), which SUSPENDS claude or
+        // codex — the pane drops to its shell and the session looks closed,
+        // with nothing on screen saying `fg` brings it back. In a browser
+        // Ctrl+Z means undo, so it sends Ctrl+_ — undo in Claude Code's prompt
+        // and in bash/readline — and never suspends the program.
+        if (ev.ctrlKey && !ev.altKey && !ev.metaKey && !ev.shiftKey && key === "z") {
+          ev.preventDefault();
+          term.input("\x1f", true);
+          return false;
+        }
         if (ev.key === "Tab" && tabMovesRef.current) return false;
         if (ev.key === "Tab" && ev.shiftKey) ev.preventDefault();
         return true;