bug: Installation assumes that ~/.local/bin exists when setting up the terminal

### 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

Mac OS Sequoia 15.6

### Expected behaviour

When installing from the GUI, installation should work and if there are any issue with the installation it should state the issues and give remedies for it.

### Actual behaviour

When installing from the GUI it appears that it assumes ~/.local/bin exists when setting up the terminal. We had a few people that have never installed packages etc. on their macs.

So when running 'q chat' they would get a 'command not found' error.

Basically, because the folder didn't exist it couldn't create the symbolic link.

Q doctor would show that QTerm isn't running.

The following fixed it:

1. Verify Amazon Q app is installed:
bashls -la "/Applications/Amazon Q.app/Contents/MacOS/q"
(Should show the executable file)

2. Create the local bin directory:
mkdir -p ~/.local/bin

3. Create the symbolic link:
ln -s "/Applications/Amazon Q.app/Contents/MacOS/q" ~/.local/bin/q

4. Add ~/.local/bin to your PATH:
echo 'export PATH="$HOME/.local/bin:$PATH"' >> ~/.zshrc

5. Reload your shell configuration:
source ~/.zshrc

6. Test that q command works:
q --version

Then for some users that had Chat GPT'd it turning the Terminal integration off and on, then opening a new terminal fixed the issue.

### Steps to reproduce

1. On a mac without a ~/.local/bin
2. Run the GUI installer
3. When complete
4. Run Q chat in a new terminal window

### Environment

```yaml
[q-details]
version = "1.15.0"
hash = "eb8db5c635fc469f3bd94ead16bb4bfb32d7443b"
date = "2025-09-02T17:57:24.662205Z (8d ago)"
variant = "full"

[system-info]
os = "macOS 15.6.0 (24G84)"
chip = "Apple M1 Pro"
total-cores = 10
memory = "16.00 GB"

[environment]
cwd = "/Volumes/git-workspace/code/ai-taf"
cli-path = "/Volumes/git-workspace/code/ai-taf"
os = "Mac"
shell-path = "/opt/homebrew/Cellar/zsh/5.9/bin/zsh"
shell-version = "5.9"
terminal = "VSCode"
install-method = "brew"

[env-vars]
PATH = "/Users/USER/.rd/bin:/opt/homebrew/opt/node@18/bin:/Users/USER/.nvm/versions/node/v16.20.2/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:/Library/Apple/usr/bin:/opt/podman/bin:/Users/USER/.rd/bin:/opt/homebrew/opt/node@18/bin:/Users/USER/.nvm/versions/node/v16.20.2/bin:/Users/USER/.local/bin:/Users/USER/.vscode/extensions/ms-python.debugpy-2025.10.0-darwin-arm64/bundled/scripts/noConfigScripts:/opt/homebrew/bin"
QTERM_SESSION_ID = "3e6b2eef5bd74705979821b4bac25425"
Q_SET_PARENT_CHECK = "1"
Q_TERM = "1.15.0"
SHELL = "/bin/zsh"
TERM = "xterm-256color"
ZDOTDIR = "/Users/USER"
__CFBundleIdentifier = "com.microsoft.VSCode"
```