Completion window does not appear near command line

### Checks

- [x] I have searched [github.com/aws/amazon-q-developer-cli/issues](https://github.com/aws/amazon-q-developer-cli/issues?q=) and there are no duplicates of my issue
- [x] I have run `q doctor` in the affected terminal session
- [x] I have run `q restart` and replicated the issue again

### Operating system

macOS 26.2.0 (25C56)

### Expected behaviour

When I type a command, like ls, and hit space, I expect the completion popup to appear at or very near the location of the command line.

### Actual behaviour

When I try to use Kiro cli completion, the completion window that pops up is displayed in the middle of my screen, not near the command line running in the terminal for which I expected the completion popup. This happens for multiple terminal applications on MacOS, including iTerm2, kitty, and ghostty (which I'm currently using, with the terminal window in the lower right corner of my screen). This makes it completely unusable.

### Steps to reproduce

1. Make sure Kiro has command line completion turned on
2. Place your terminal window somewhere away from the center of the screen (like the lower right corner).
3. type "ls" and then space
4. Note that the popup is in the center of the screen, not near the command line

### Environment

```yaml

[q-details]
version = "1.24.1"
hash = "ffce156030f05d9cec3d4817c3a64245a967db74"
date = "2026-01-27T20:48:19.714341Z (3d ago)"
variant = "full"

[system-info]
os = "macOS 26.2.0 (25C56)"
chip = "Apple M2 Max"
total-cores = 12
memory = "96.00 GB"

[environment]
cwd = "/Users/USER"
cli-path = "/Users/USER"
os = "Mac"
shell-path = "/opt/homebrew/Cellar/zsh/5.9/bin/zsh"
shell-version = "5.9"
terminal = "Ghostty"
install-method = "unknown"

[env-vars]
DISPLAY = "/private/tmp/com.apple.launchd.eSk5mEsYAg/org.xquartz:0"
PATH =
QTERM_SESSION_ID = "9a5953c2170a4d02939623641281ecdc"
Q_SET_PARENT_CHECK = "1"
Q_TERM = "1.24.1"
SHELL = "/opt/homebrew/bin/zsh"
TERM = "xterm-ghostty"
__CFBundleIdentifier = "com.mitchellh.ghostty"
```