chore(warn): include key name in inject() usage warning

[Tia-ani]

• This PR improves the developer warning message in inject() when used outside setup() or functional components.

Before:

inject() can only be used inside setup() or functional components.

After:

inject("userStore") can only be used inside setup() or functional components.

• This makes it easier for developers to identify which injection key caused the warning.

• solves issue #13287