fix(core): add support for zoneless apps

[mattlewis92]

Please check if the PR fulfills these requirements

• The commit message follows our guidelines: https://github.com/moribvndvs/ng2-idle/blob/master/CONTRIBUTING.md#pr
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

What kind of change does this PR introduce? (check one with "x")

[x] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[ ] Other... Please describe:

What is the current behavior? (You can also link to an open issue here)
The app throws a "Zone is not defined" error when running with zone.js removed (i.e. is running in zoneless mode)

What is the new behavior?
No error is thrown

Does this PR introduce a breaking change? (check one with "x")

[ ] Yes
[x] No

If this PR contains a breaking change, please describe the impact and migration path for existing applications: ...

Other information:

[evilaliv3]

The patch works great for me!

@grbsk do you have have advice on who could do the next review necessary?

[evilaliv3]

@grbsk: I'm sorry to ask again, but it would be very beneficial to merge the patch proposed and issue a new release.

Angular in fact has just taken Zoneless mode to from preview mode to stable with the release 20.2.0

Please let me know if you need any support.

[romainhealth]

Hi, can we help on this issue ? Is there any approved reviewers nearby ?

I'm interessed in this update.

[r05014]

I'm also interested in this update, especially for the support of Angular applications in zoneless mode, which is becoming increasingly common with Angular 20.2.0.
The proposed patch works very well on my end as well.
Is there a reviewer available to finalize this PR?