feat(NbDialogService): support passing values to input/model signals

This makes an exception for input and model signals in the DialogConfig
context, so the typehint will show as the type of the signal's value,
but internally it will create a signal with the passed value.
Technically these will just be readonly signals instead of input or model
signals, but since components used as a dialog do not support regular
outputs anyway, it should not matter. When used in a regular context the
input signal will not be overwritten and work as usual.

closes #3256
(I would not classify this as a bug but a missing feature instead)

src/framework/theme/components/dialog/dialog-config.ts

@@ -4,11 +4,19 @@
  * Licensed under the MIT License. See License.txt in the project root for license information.
  */
 
-import { InjectionToken, ViewContainerRef } from '@angular/core';
+import { InjectionToken, InputSignal, Signal, ViewContainerRef } from '@angular/core';
 
 
 export const NB_DIALOG_CONFIG = new InjectionToken<NbDialogConfig>('Default dialog options');
 
+type DialogData<T> = {
+  [K in keyof T]: ExtractInputSignalType<T[K]>;
+};
+
+type ExtractInputSignalType<Type> = Type extends InputSignal<infer X> ? X : ExcludeSignal<Type>;
+
+type ExcludeSignal<Type> = Type extends Signal<unknown> ? never : Type;
+
 /**
  * Describes all available options that may be passed to the NbDialogService.
  * */
@@ -56,7 +64,7 @@ export class NbDialogConfig<D = any> {
    */
   viewContainerRef: ViewContainerRef;
 
-  context: D;
+  context: DialogData<D>;
 
   constructor(config: Partial<NbDialogConfig>) {
     Object.assign(this, config);

src/framework/theme/components/dialog/dialog.service.ts

@@ -4,7 +4,7 @@
  * Licensed under the MIT License. See License.txt in the project root for license information.
  */
 
-import { ComponentFactoryResolver, Inject, Injectable, Injector, TemplateRef, Type } from '@angular/core';
+import { ComponentFactoryResolver, Inject, Injectable, Injector, signal, TemplateRef, Type } from '@angular/core';
 import { fromEvent as observableFromEvent } from 'rxjs';
 import { filter, takeUntil } from 'rxjs/operators';
 
@@ -21,6 +21,7 @@ import { NB_DOCUMENT } from '../../theme.options';
 import { NB_DIALOG_CONFIG, NbDialogConfig } from './dialog-config';
 import { NbDialogRef } from './dialog-ref';
 import { NbDialogContainerComponent } from './dialog-container';
+import { SIGNAL } from '@angular/core/primitives/signals';
 
 
 /**
@@ -209,7 +210,15 @@ export class NbDialogService {
       dialogRef.componentRef = container.attachComponentPortal(portal);
 
       if (config.context) {
-        Object.assign(dialogRef.componentRef.instance, { ...config.context })
+        for (const [key, value] of Object.entries({...config.context})) {
+          const instance = dialogRef.componentRef.instance; 
+          const member = instance[key];
+          if (typeof member === 'function' && member[SIGNAL] !== undefined) {
+            instance[key] = signal(value).asReadonly();
+          } else {
+            instance[key] = value;
+          }
+        }
       }
     }
   }