feat: Add profile images

toju-app/src/app/domains/profile-avatar/infrastructure/services/profile-avatar-storage.service.ts

@@ -0,0 +1,58 @@
+import { Injectable, inject } from '@angular/core';
+import { ElectronBridgeService } from '../../../../core/platform/electron/electron-bridge.service';
+import { User } from '../../../../shared-kernel';
+import {
+  ProcessedProfileAvatar,
+  resolveProfileAvatarStorageFileName
+} from '../../domain/profile-avatar.models';
+
+const LEGACY_PROFILE_FILE_NAMES = [
+  'profile.webp',
+  'profile.gif',
+  'profile.jpg',
+  'profile.jpeg',
+  'profile.png'
+];
+
+@Injectable({ providedIn: 'root' })
+export class ProfileAvatarStorageService {
+  private readonly electronBridge = inject(ElectronBridgeService);
+
+  async persistProcessedAvatar(
+    user: Pick<User, 'id' | 'username' | 'displayName'>,
+    avatar: Pick<ProcessedProfileAvatar, 'base64' | 'avatarMime'>
+  ): Promise<void> {
+    const electronApi = this.electronBridge.getApi();
+
+    if (!electronApi) {
+      return;
+    }
+
+    const appDataPath = await electronApi.getAppDataPath();
+    const usernameSegment = this.sanitizePathSegment(user.username || user.displayName || user.id || 'user');
+    const directoryPath = `${appDataPath}/user/${usernameSegment}/profile`;
+    const targetFileName = resolveProfileAvatarStorageFileName(avatar.avatarMime);
+
+    await electronApi.ensureDir(directoryPath);
+
+    for (const fileName of LEGACY_PROFILE_FILE_NAMES) {
+      const filePath = `${directoryPath}/${fileName}`;
+
+      if (fileName !== targetFileName && await electronApi.fileExists(filePath)) {
+        await electronApi.deleteFile(filePath);
+      }
+    }
+
+    await electronApi.writeFile(`${directoryPath}/${targetFileName}`, avatar.base64);
+  }
+
+  private sanitizePathSegment(value: string): string {
+    const normalized = value
+      .trim()
+      .replace(/[^a-zA-Z0-9._-]+/g, '-')
+      .replace(/^-+|-+$/g, '')
+      .slice(0, 80);
+
+    return normalized || 'user';
+  }
+}