feat: v2.6.0 — Chat UI composer (+ menu, project files, activity panel, permission mode, Stop), git on a workspace's extra folders (#70), long paste as a file (#68), S3 server mode (experimental)

Chat UI:
- Each Claude/Codex session keeps its own chat/terminal view; Settings only
  sets how new sessions open.
- Composer + menu: upload, project files and folders (#54, also dragged from
  the Files/Changes tree), context files, recent uploads, skills, plugins.
- Activity side panel (progress, outputs, files read, uploads, memory,
  skills, connectors) with a file preview; edited-file counts per turn.
- Permission-mode chip (Shift+Tab steps, read back from the pane:
  server/lib/pane-mode.js, GET|POST /api/run/:id/permission-mode).
- Stop (Esc) while the main agent works; the status is checked per agent
  (with session_id /api/agents ignores its status filter) and re-read every
  5 s while Stop shows.
- Dropped images shown in the conversation (GET /api/run/drop/:name, the
  requester's own drop dir), full-size viewer.
- A plain-text paste over 5,000 characters is attached as pasted-text.txt,
  so no prompt reaches tmux/argv limits (#68).

Changes panel: every /api/lanes/:id/git* route takes ?source=<lane_sources
id> (sourceFolder; ENOSOURCE otherwise) and a folder picker switches the
whole panel to a workspace's extra folder (#70).

Server mode S3 (one Linux user per account) — experimental, verified with
fake sudo plus a P6 managed-settings spike on a test account:
- member tmux listing runs in the background (cached, 15 s => unknown);
- transcript snapshot copy is async, chunked, temp file + rename;
- Express Layer patch only on Express 4;
- tmux capturePane/sendKey go to the member's own server.

Docs: the multi-user design moved in as docs/plans/server-mode/README.md
(the AgentHub-Server repo is gone); S3-PLAN P6 result; LANES/API/openapi.

client/src/components/run/__tests__/ChatOutline.test.tsx

@@ -0,0 +1,87 @@
+/**
+ * @file ChatOutline.test.tsx
+ * @description The Chat pane's activity panel renders a session's outline the
+ * way Claude Desktop does: progress with done/current items, outputs by name
+ * with an EXT tag (a click opens that file), and "Used in this session" rows —
+ * uploads, files read and memory open their list, skills link to the config.
+ * @author Nguyễn Ngọc Trí Vĩ <vinnt@smartgift.vn>
+ */
+
+import { fireEvent, render, screen } from "@testing-library/react";
+import { MemoryRouter } from "react-router-dom";
+import { describe, expect, it, vi } from "vitest";
+import { ChatOutline } from "../ChatOutline";
+
+const outline = {
+  progress: [
+    { id: "1", subject: "Parse plan", status: "completed" },
+    { id: "2", subject: "Build report", status: "in_progress" },
+  ],
+  outputs: ["/w/out/Progress report.xlsx"],
+  files: ["/w/src/a.ts", "/w/src/b.ts", "/w/src/c.ts"],
+  uploads: ["/tmp/agenthub-drops-1000/0123456789abcdef-minutes.xlsx"],
+  memory: ["/h/.claude/projects/-w/memory/release.md"],
+  skills: ["xlsx"],
+  mcp: ["vercel_vercel"],
+};
+
+describe("ChatOutline", () => {
+  it("shows progress, outputs and what the session used", () => {
+    const onClose = vi.fn();
+    const onOpenFile = vi.fn();
+    const onOpenList = vi.fn();
+    render(
+      <MemoryRouter>
+        <ChatOutline
+          outline={outline}
+          onClose={onClose}
+          onOpenFile={onOpenFile}
+          onOpenList={onOpenList}
+        />
+      </MemoryRouter>
+    );
+    expect(screen.getByText("Parse plan").className).toContain("line-through");
+    expect(screen.getByText("Build report").className).not.toContain("line-through");
+
+    fireEvent.click(screen.getByRole("button", { name: "XLSX: Progress report" }));
+    expect(onOpenFile).toHaveBeenCalledWith("/w/out/Progress report.xlsx");
+
+    // An upload is named without the drop dir's random prefix.
+    fireEvent.click(screen.getByTitle("Uploads: minutes.xlsx"));
+    expect(onOpenList).toHaveBeenCalledWith("uploads");
+    expect(screen.getByText("+1")).toBeTruthy(); // three files read, two named
+    fireEvent.click(screen.getByTitle("Memory: release"));
+    expect(onOpenList).toHaveBeenCalledWith("memory");
+    expect(screen.getByTitle("Skills: xlsx").getAttribute("href")).toBe(
+      "/settings/agents/claude-code?tab=skills"
+    );
+    expect(screen.getByText("vercel_vercel")).toBeTruthy();
+
+    fireEvent.click(screen.getByRole("button", { name: "Hide side panel" }));
+    expect(onClose).toHaveBeenCalled();
+  });
+
+  it("hides progress and the used section when there is none", () => {
+    render(
+      <MemoryRouter>
+        <ChatOutline
+          outline={{
+            ...outline,
+            progress: [],
+            files: [],
+            uploads: [],
+            memory: [],
+            skills: [],
+            mcp: [],
+          }}
+          onClose={() => {}}
+          onOpenFile={() => {}}
+          onOpenList={() => {}}
+        />
+      </MemoryRouter>
+    );
+    expect(screen.queryByText("Progress")).toBeNull();
+    expect(screen.queryByText("Used in this session")).toBeNull();
+    expect(screen.getByRole("button", { name: "Hide side panel" })).toBeTruthy();
+  });
+});