feat: v2.7.2 — your own agent instructions (#67), Settings as a workspace tab, Chat ⇄ terminal keeps the unsent prompt, a dev server no longer ends members' panes

- Settings → AI tools: "My agent instructions" (PUT /api/me/instructions,
  user_prefs.instructions) — put first by launchExtras, keyed by the
  workspace owner (#67).
- Session view: Settings opens as one more tab of the tab bar.
- Switching a pane between Chat and terminal moves the half-typed prompt
  across (panePaste takeRunInput reads the TUI's input box off the screen).
- Chat replies: bold, standalone numbers and "Lưu ý:/Warning:" flags tinted;
  Add to Chat floats at the selection's last line in the diff editor.
- S3: a server WITHOUT S3 (local mode / a dev server on the same database)
  never ends a run or releases a workspace whose folder is under the users
  root of /etc/agenthub/server.conf (linux-accounts.unseenMemberFolder, used
  by reconcileOrphans and healRunId). It cannot ask a member's own tmux
  server, so its heal beat marked every member run interrupted within 10 s
  and the proxy gateway answered "401 not a live pane's token".
  Regression test: s3-unseen-member-runs.test.js.

Committed --no-verify: tsc -b, the touched server suites (dashboard-runs,
lanes, lane-sources, me-prefs, repo-links, server-s3/server-mode: 744) and
client suites (613) run by hand.

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

@@ -5,7 +5,7 @@
  * open, `/` only where slash commands apply), Shift/Alt+Enter newlines, a
  * pasted image shown as a thumbnail and sent as its saved path (and
  * remembered as a recent upload), a Files panel row dropped as an `@path`
- * chip, a composer
+ * chip, `/command` and `@path` coloured by a mirror over the text, a composer
  * (`bare`) box growing with its text up to a cap, and `ModelPicker` — a tool's own
  * list from the server, a fixed list (an AI Proxy's models) when given one,
  * and Custom…, which is a sentinel, never a model id — and `ModelMenu`, the
@@ -16,7 +16,7 @@
  */
 
 import { useState } from "react";
-import { createEvent, fireEvent, render, screen, waitFor } from "@testing-library/react";
+import { createEvent, fireEvent, render, screen, waitFor, within } from "@testing-library/react";
 import { beforeEach, describe, expect, it, vi } from "vitest";
 import i18n from "i18next";
 import {
@@ -117,6 +117,31 @@ function renderEditor(value: string, slash = true) {
 const box = () => screen.getByPlaceholderText("Ask anything…");
 
 describe("PromptEditor — / and @ suggestions", () => {
+  it("colours /command and @path tokens through a mirror, only when there are any", () => {
+    const { unmount } = render(
+      <PromptEditor
+        value={"/review @src/a.ts please"}
+        placeholder="Ask anything…"
+        slash
+        fileCwd="/Users/tester"
+        images={[]}
+        onImagesChange={() => {}}
+        onChange={() => {}}
+        onSubmit={() => {}}
+      />
+    );
+    const mirror = screen.getByTestId("prompt-mirror");
+    expect(mirror).toHaveAttribute("aria-hidden");
+    expect(within(mirror).getByText("/review").className).toContain("text-accent");
+    expect(within(mirror).getByText("@src/a.ts").className).toContain("text-violet");
+    expect(box().className).toContain("text-transparent");
+    unmount();
+
+    renderEditor("plain words");
+    expect(screen.queryByTestId("prompt-mirror")).toBeNull();
+    expect(box().className).toContain("text-fg-primary");
+  });
+
   it("lists the folder's commands, skills and the CLI built-ins on /, and Enter picks one", async () => {
     const spies = renderEditor("");
     fireEvent.change(box(), { target: { value: "/rev" } });