Desktop (macOS): computer-use permission dialog has only a Deny button, no Allow

### Environment
- Claude Desktop (macOS): app version 1.49585.0, Electron 44.2.0, Node 24.20.0
- macOS, Apple Silicon (arm64)
- Cowork session running in cloud, linked to this Mac ("Link to this computer")
- Target app: Telegram Desktop (bundle id `ru.keepcoder.Telegram`)

### What happens
When the session calls `computer_request_access` for Telegram, the desktop shows the approval dialog
"Claude wants to use Telegram", but the dialog renders **only a "Deny ⌘." button**. There is no
"Allow" / "Approve" control anywhere in the dialog. The only way to close it is Deny, so every request
comes back as `User rejected mcp__remote-devices__computer_request_access`.

Screenshots of the dialog were taken by the user (two of them) and confirm there is no Allow button.

### Reproduction
1. Start a Cowork session linked to the Mac.
2. From the session, call `computer_resolve_access(["Telegram"])` → resolves fine
(`tier: full`, `preferredModeDefault: background`, `screenshotFiltering: native`).
3. Call `computer_request_access` with the resolved entry and a reason.
4. The approval dialog appears on the Mac with a single "Deny" button.

Reproduced 8 times over ~3 hours (2026-09-09, 15:00–20:30 UTC+5), across several turns and one
MCP reconnect.

### What was already tried (no effect)
- Signing out of the desktop app and signing back in
- Fully quitting and relaunching Claude Desktop
- Reconnecting the remote-devices MCP (grants are dropped on reconnect, dialog still broken)
- Waiting several hours between attempts

### Expected
The dialog should offer Allow (and Deny), as it did earlier: computer-use access to the same Telegram
app was granted successfully from the same Mac on 2026-09-08 (evening) and on 2026-09-09 around
14:50 local time, and full-screen control worked. The dialog broke later the same day.

### Notes
- `computer_request_full_control` was never reached, because the app grant itself fails first.
- Other remote-devices tools (device_bash on connected folders, Chrome extension) keep working fine
in the same session, so the link itself is healthy — it is specifically the computer-use approval UI.

Start by reproducing on macOS with Claude Desktop 1.49585.0 using the reported remote-devices flow: computer_resolve_access(["Telegram"]) followed by computer_request_access. The relevant entry points named are the computer-use approval dialog and remote-devices MCP access request path. Done means the dialog offers both Allow and Deny and the request no longer returns User rejected when Allow is chosen.

Written by the indexing model from the issue text.