refactor: always navigate, rm edit/add scren from history stack

src/app/services/chain-settings.ts

@@ -1,7 +1,9 @@
 import { inject, Injectable } from '@angular/core';
+import { Location } from '@angular/common';
+import { Router } from '@angular/router';
+
 import { ChainDAO } from '../dao/ChainDAO';
 import { ImageStorage } from './image-storage';
-import { Router } from '@angular/router';
 import { Chain } from '../models/Chain';
 
 @Injectable({
@@ -11,6 +13,7 @@ export class ChainSettings {
   private readonly chainDAO = inject(ChainDAO);
   private readonly imageStorage = inject(ImageStorage);
   private readonly router = inject(Router);
+  private readonly location = inject(Location);
 
   async save(chain: Chain, img: File | null) {
     try {
@@ -19,11 +22,12 @@ export class ChainSettings {
         chain.image = imgFileName;
       }
       await this.chainDAO.insert(chain);
-      this.router.navigate(['settings', 'chains']);
     } catch (e) {
       console.error(e);
       //TODO: report problem
     }
+    this.router.navigate(['settings', 'chains']);
+    this.location.replaceState('settings');
   }
 
   async update(prevChain: Chain, updatedChain: Chain, img: File | null) {
@@ -39,10 +43,11 @@ export class ChainSettings {
         }
       }
       await this.chainDAO.update(updatedChain, { id: updatedChain.id });
-      this.router.navigate(['settings', 'chains']);
     } catch (e) {
       console.error(e);
       //TODO: report problem
     }
+    this.router.navigate(['settings', 'chains']);
+    this.location.replaceState('settings');
   }
 }