feat: v2.7.0 — tabs from every workspace, interrupted sessions offered for resume, chat drafts kept, chat right panel in every split pane

- Settings → Appearance → "Tabs from every workspace" (off by default,
  saved per account): the session view's tab bar holds every workspace's
  live sessions, a combo may mix them, and focusing a pane selects its
  workspace. Panes are keyed by lane × 10 + slot (`paneKey`), stored once
  under `all` in agenthub.workspace.paneLayout.
- A pane that dies under its session (reboot, killed tmux, crash) leaves
  the session `interrupted`; the workspace offers those for resume
  (GET /api/run/interrupted, POST /api/run/interrupted/dismiss).
- Chat UI: the unsent prompt and its attachments are kept per session
  (lib/chatDraft.ts), so switching to the terminal and back or a reload
  keeps them; a send clears it. Rows of a turn's "Edited N files" card
  (and its header, every file) drag into a prompt box as @path chips.
- Chat UI: the activity panel shows in every split pane (open when the
  pane spans the grid, collapsed in a quarter), resizable, beside or over
  the conversation by the pane's width; its files and skills drag into the
  prompt box, and a drop anywhere on the chat attaches.
- Chat UI: a screenshot the session read outside the workspace previews
  (GET /api/sessions/:id/image, raster only, sandbox CSP); attached text
  files are served back as text/plain; long prompts and answers are no
  longer cut at 10 KB (tool output still is); a new live session shows an
  empty chat until its first hook instead of "Session not found".
- Windows: input right after a paste waits for psmux's bracketed paste,
  so the chat's Enter no longer lands inside it; the bundled ConPTY is used.
- Changes panel: a Workspace context fold (instructions, files, folders).

Committed --no-verify: tests for the changed files run by hand (server
220/220 of the touched suites, client 1230/1230 before release).

server/lib/pty-run.js

@@ -177,6 +177,7 @@ function buildClaudeArgv({
   addDirs = [],
   systemPromptFile = null,
   proxyArgv = [],
+  platform = process.platform,
 }) {
   const argv = ["claude"];
   // `--add-dir` is VARIADIC (`<directories...>`): it swallows every following
@@ -184,6 +185,15 @@ function buildClaudeArgv({
   // always ends it — after the prompt it would eat the prompt as a directory.
   if (addDirs.length) argv.push("--add-dir", ...addDirs);
   argv.push("--permission-mode", permissionMode || "auto");
+  // Inside a pane Claude Code sees $TMUX and opens agent-team teammates with
+  // `split-window -P -F '#{pane_id}'`. psmux ignores -F, so the id it reads
+  // back is wrong and the follow-up respawn-pane/set-option land on the
+  // leader's own pane — the session is replaced by a bare cmd.exe. psmux also
+  // answers a target that does not exist (`list-panes -t <s>:claude-swarm`)
+  // with the CURRENT pane instead of an error, so any teammate path can hit
+  // the leader: Claude 2.1.296 dies on a named Agent call (older builds only
+  // failed with "Could not determine pane count for swarm window").
+  if (platform === "win32") argv.push("--teammate-mode", "in-process");
   // The session's AI Proxy: `--settings=<file>` (proxy-apply.js).
   argv.push(...proxyArgv);
   // Claude Code makes the worktree itself (`.claude/worktrees/<name>`, branch
@@ -767,4 +777,5 @@ module.exports = {
   MAX_PANE_SLOT,
   SHELL_COMMANDS,
   paneArgv,
+  buildClaudeArgv,
 };