send command hangs indefinitely without --timeout

**Problem:** `tgcli send text` without `--timeout` can hang forever on MTProto connection. No default timeout.

**Repro:**
```bash
tgcli send text --to @user --message 'test'
# hangs with no output, no timeout
```

**Expected:** Reasonable default timeout (e.g. 30s) or at least a visible 'Connecting...' status.