Can't login with Google account (Kiro Pro+ subscription) - "profileArn is required but no profiles are available" after successful login

### 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 26.4.0 (25E246)

### Expected behaviour

- After logging in with Google Sign-in, the CLI should properly load my Kiro Pro+ subscription and associated profile (profileArn).
- I should be able to send messages without any profile-related errors.
- The /model command should display all available models.

### Actual behaviour

- I can successfully log in using Google Sign-in with the email tied to my Kiro Pro+ subscription.
After login, sending any message (e.g. "hi") fails with this error:

```
Kiro is having trouble responding right now:
0: Failed to send the request: An unknown error occurred: profileArn is required but no profiles are available. Please log in and select a profile.
1: An unknown error occurred: profileArn is required but no profiles are available. Please log in and select a profile.
Location:
crates/chat-cli/src/cli/chat/mod.rs:1647
```

- Running /model only shows:

```
Select model (type to search):
> * auto ----- credits
```

- No actual models are listed.
- Logging in with Builder ID works, but my Pro+ subscription (tied to Google email) is not recognized.
- This was working correctly before.

### Steps to reproduce

- Open Kiro-CLI.
- Log in using Google Sign-in (with the Google account that has active Kiro Pro+ subscription).
- Once logged in, send a simple message like hi.
- Observe the profileArn is required but no profiles are available error.
- Run the command /model and notice only "auto ----- credits" is shown.

### Environment

```yaml

[q-details]
version = "1.28.2"
hash = "27868a6e6508e32a80d15e6eba2f6adbab6c2aa7"
date = "2026-03-27T00:14:48.847531Z (2d ago)"
variant = "full"

[system-info]
os = "macOS 26.4.0 (25E246)"
chip = "Apple M5"
total-cores = 10
memory = "24.00 GB"

[environment]
cwd = "/Users/USER/.kiro"
cli-path = "/Users/USER/.kiro"
os = "Mac"
shell-path = "/bin/zsh"
shell-version = "5.9"
terminal = "macOS"
install-method = "unknown"

[env-vars]
PATH = "/Users/USER/.local/bin:/Library/Frameworks/Python.framework/Versions/3.14/bin:/Users/USER/.bun/bin:/Library/Frameworks/Python.framework/Versions/3.13/bin:/Users/USER/.antigravity/antigravity/bin:/opt/homebrew/bin:/Library/Frameworks/Python.framework/Versions/3.14/bin:/opt/homebrew/bin:/opt/homebrew/sbin:/usr/local/bin:/System/Cryptexes/App/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin:/var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/local/bin:/var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/bin:/var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/appleinternal/bin:/opt/pkg/env/active/bin:/opt/pmk/env/global/bin:/Users/USER/.local/bin"
QTERM_SESSION_ID = "ca79ec7e0dd0450f9e2527ab7cf81476"
Q_SET_PARENT_CHECK = "1"
Q_TERM = "1.28.2"
SHELL = "/bin/zsh"
TERM = "xterm-256color"
__CFBundleIdentifier = "com.apple.Terminal"
```