feat: v2.7.6 — edit users in one form, Settings → Account, display names, copy over plain HTTP

- Users page: one Edit user form (display name, email, role, active, a new or
  generated password, workspaces given or taken back, sign out everywhere),
  validated as a whole before anything is written (PATCH /api/users/:id,
  GET /api/users/:id); users.display_name/email added migration-safe.
- Settings → Account for every signed-in user: profile, own password (the
  current one required, this login kept), sign out other devices
  (/api/me/account, /api/me/password, /api/me/sign-out-others; login cookie
  only, never a pane token).
- Display names wherever a person is named (sidebar, workspace owner groups,
  Users page and audit log); owner_display_name / reader_display additive.
- Users page: admins add and remove Claude/Codex pool accounts.
- Folder browser: an admin with their own Linux account opens in their home;
  the "Server folder" tick opens the host's (never remembered).
- AI Proxy: "Config 9router" beside Add profile when 9router is installed,
  opened on the dashboard's own host (GET /api/ai-proxies/9router).
- Terminal: a tmux selection reaches the clipboard over plain HTTP too
  (writeClipboard's textarea fallback, focus handed back).
- Chat: a file the session touched outside the workspace previews
  (GET /api/sessions/:id/file).
- install-system: `!requiretty` only when visudo accepts it (sudo-rs on
  Ubuntu 25.10+ rejects the setting).
- openapi.yaml regenerated; docs (API, SERVER-MODE, LANES) updated.

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

client/src/components/PathPickButton.tsx

@@ -12,7 +12,7 @@
  * @author Nguyễn Ngọc Trí Vĩ <vinnt@smartgift.vn>
  */
 
-import { useState, type Ref } from "react";
+import { useState } from "react";
 import { useTranslation } from "react-i18next";
 import { FolderOpen } from "lucide-react";
 import { api } from "../lib/api";
@@ -23,15 +23,12 @@ export function PathPickButton({
   start,
   onPick,
   showLabel = false,
-  buttonRef,
 }: {
   kind?: "dir" | "file";
   /** The field's current value — the picker opens there. */
   start?: string;
   onPick: (path: string) => void;
   showLabel?: boolean;
-  /** Lets a field beside it open the same picker (a click on an empty path). */
-  buttonRef?: Ref<HTMLButtonElement>;
 }) {
   const { t } = useTranslation(["lanes"]);
   const [busy, setBusy] = useState(false);
@@ -55,7 +52,6 @@ export function PathPickButton({
   return (
     <>
       <button
-        ref={buttonRef}
         type="button"
         onClick={pick}
         disabled={busy}