feat(web): add saved searches, image lightbox, and web vitals tracking

New features:
- Saved searches dashboard page with CRUD hooks and API client
- Image lightbox component for property gallery full-screen viewing
- Web vitals provider and reporting utilities for performance monitoring
- Image blur placeholder generation utility

Co-Authored-By: Paperclip <noreply@paperclip.ing>

apps/web/lib/saved-search-api.ts

@@ -0,0 +1,66 @@
+import { apiClient } from './api-client';
+
+// ─── Interfaces ──────────────────────────────────────────
+
+export interface SavedSearchFilters {
+  transactionType?: string;
+  propertyType?: string;
+  city?: string;
+  district?: string;
+  priceMin?: string;
+  priceMax?: string;
+  areaMin?: string;
+  areaMax?: string;
+  bedrooms?: string;
+}
+
+export interface SavedSearch {
+  id: string;
+  name: string;
+  filters: SavedSearchFilters;
+  alertEnabled: boolean;
+  lastAlertAt: string | null;
+  createdAt: string;
+}
+
+export interface SavedSearchListResult {
+  data: SavedSearch[];
+  total: number;
+  page: number;
+  limit: number;
+}
+
+export interface CreateSavedSearchPayload {
+  name: string;
+  filters: SavedSearchFilters;
+  alertEnabled?: boolean;
+}
+
+export interface UpdateSavedSearchPayload {
+  name?: string;
+  filters?: SavedSearchFilters;
+  alertEnabled?: boolean;
+}
+
+// ─── API Functions ───────────────────────────────────────
+
+export const savedSearchApi = {
+  list: (params: { page?: number; limit?: number } = {}) => {
+    const query = new URLSearchParams();
+    if (params.page) query.append('page', String(params.page));
+    if (params.limit) query.append('limit', String(params.limit));
+    const qs = query.toString();
+    return apiClient.get<SavedSearchListResult>(`/saved-searches${qs ? `?${qs}` : ''}`);
+  },
+
+  getById: (id: string) => apiClient.get<SavedSearch>(`/saved-searches/${id}`),
+
+  create: (data: CreateSavedSearchPayload) =>
+    apiClient.post<SavedSearch>('/saved-searches', data),
+
+  update: (id: string, data: UpdateSavedSearchPayload) =>
+    apiClient.patch<SavedSearch>(`/saved-searches/${id}`, data),
+
+  delete: (id: string) =>
+    apiClient.delete<{ deleted: boolean }>(`/saved-searches/${id}`),
+};