Angular 21 + Zoneless

[bobbyquantum]

This PR contains:

• bugfix
• feature
• refactor
• tests
• documentation
• others

Breaking Changes?

• yes
• no

Checklist

• commit messages follow the Conventional Commits pattern
  • A feature commit message is prefixed "feat:"
  • A bugfix commit message is prefixed "fix:"
  • A document related commit is prefixed "docs:"
• docs have been added / updated (for bug fixes / features)

Describe Your Changes

✅ Angular 21 support
✅ Zoneless change detection (provideZonelessChangeDetection())
✅ OnPush change detection for all components
✅ Angular Signals for reactive state
✅ Modern control flow (@if, @for instead of *ngIf, *ngFor)
✅ inject() pattern instead of constructor injection
✅ Ctrl/Cmd+Click to open links in editor

Does this PR affects any existing issues?

• yes
• no

Partial fix for #636 (adds Angular 21, but not 19 or 20 support)

Fixes #614 (issues with change detection in zoneless, which was also preventing image resize in that mode)

Partial fix for #602 (adds a ctrl/mod + click shortcut to open links. Direct navigation on click when editing text is too abrupt, whereas requiring ctrl/mod+click requires intention, and matches up with other software where links can be embedded.

---

Looking at activity on this library, it seems that this PR is fairly unlikely to get merged, so I've also pushed a scoped fork up, if anyone would like to try out using zoneless Angular 21:

npm install @bobbyquantum/ngx-editor

Also stackblitz webcontainer here:
https://stackblitz.com/edit/stackblitz-starters-7jpjrzav?file=src%2Fapp.component.ts

The scoped package version is on branch main of my fork, but I will keep branch ng21 unscoped for reference of the changes.

I hope this PR is of some use if Angular 21 support is ever added, and thanks for work on this library.