perf: Optimizing the image loading

Does no longer load all klipy images through image proxy from signal server. Improves loading performance.

toju-app/src/app/domains/chat/feature/chat-image-proxy-fallback.directive.ts

@@ -0,0 +1,50 @@
+import {
+  Directive,
+  HostBinding,
+  HostListener,
+  effect,
+  inject,
+  input,
+  signal
+} from '@angular/core';
+import { KlipyService } from '../application/klipy.service';
+
+@Directive({
+  selector: 'img[appChatImageProxyFallback]',
+  standalone: true
+})
+export class ChatImageProxyFallbackDirective {
+  readonly sourceUrl = input('', { alias: 'appChatImageProxyFallback' });
+
+  private readonly klipy = inject(KlipyService);
+  private readonly renderedSource = signal('');
+  private hasAppliedProxyFallback = false;
+
+  constructor() {
+    effect(() => {
+      this.hasAppliedProxyFallback = false;
+      this.renderedSource.set(this.klipy.buildRenderableImageUrl(this.sourceUrl()));
+    });
+  }
+
+  @HostBinding('src')
+  get src(): string {
+    return this.renderedSource();
+  }
+
+  @HostListener('error')
+  handleError(): void {
+    if (this.hasAppliedProxyFallback) {
+      return;
+    }
+
+    const proxyUrl = this.klipy.buildImageProxyUrl(this.sourceUrl());
+
+    if (!proxyUrl || proxyUrl === this.renderedSource()) {
+      return;
+    }
+
+    this.hasAppliedProxyFallback = true;
+    this.renderedSource.set(proxyUrl);
+  }
+}