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/run/__tests__/PaneChat.test.tsx

@@ -87,6 +87,7 @@ vi.mock("../../../lib/api", async (importOriginal) => {
           skills: [],
           mcp: [],
         }),
+        readFile: r({ text: "", truncated: false }),
       },
       lanes: {
         gitFile: r({
@@ -355,7 +356,9 @@ describe("PaneChat — the activity panel", () => {
     );
     const first = render(pane());
     fireEvent.click(
-      within(await screen.findByTestId("chat-outline")).getByRole("button", { name: "Hide side panel" })
+      within(await screen.findByTestId("chat-outline")).getByRole("button", {
+        name: "Hide side panel",
+      })
     );
     first.unmount();
     render(pane());