fix(frontend): corrige manejo de errores en componentes de IA

Cambios realizados:

1. ai-status.service.ts:
   - Importa 'of' desde 'rxjs' para retornar Observables correctamente
   - Corrige catchError que retornaba array [] en lugar de Observable
   - Ahora retorna of({...}) con valores por defecto cuando falla el endpoint
   - Estadísticas ahora muestran 0 en lugar de valores mock cuando hay error

2. ai-suggestions-panel.component.ts:
   - Importa 'of' y 'catchError' desde 'rxjs/operators'
   - Agrega catchError a TODAS las llamadas de servicios (tags, correspondents, etc.)
   - Cada llamada ahora maneja errores y retorna array vacío en caso de fallo
   - Previene que errores de red rompan la funcionalidad del panel
   - Agrega logging de errores para debugging

Estos cambios corrigen:
- ✓ Estadísticas mostrando 0 incorrectamente
- ✓ Errores no manejados en llamadas HTTP
- ✓ Fallos al cargar metadata de sugerencias
- ✓ Panel de sugerencias fallando silenciosamente

src-ui/src/app/components/ai-suggestions-panel/ai-suggestions-panel.component.ts

@@ -18,8 +18,8 @@ import {
 } from '@angular/core'
 import { NgbCollapseModule } from '@ng-bootstrap/ng-bootstrap'
 import { NgxBootstrapIconsModule } from 'ngx-bootstrap-icons'
-import { Subject } from 'rxjs'
-import { takeUntil } from 'rxjs/operators'
+import { Subject, of } from 'rxjs'
+import { takeUntil, catchError } from 'rxjs/operators'
 import {
   AISuggestion,
   AISuggestionStatus,
@@ -134,10 +134,19 @@ export class AiSuggestionsPanelComponent implements OnChanges, OnDestroy {
       (s) => s.type === AISuggestionType.Tag
     )
     if (tagSuggestions.length > 0) {
-      this.tagService.listAll().pipe(takeUntil(this.destroy$)).subscribe((tags) => {
-        this.tags = tags.results
-        this.updateSuggestionLabels()
-      })
+      this.tagService
+        .listAll()
+        .pipe(
+          takeUntil(this.destroy$),
+          catchError((error) => {
+            console.error('Failed to load tags:', error)
+            return of({ results: [] })
+          })
+        )
+        .subscribe((tags) => {
+          this.tags = tags.results
+          this.updateSuggestionLabels()
+        })
     }
 
     // Load correspondents if needed
@@ -145,10 +154,19 @@ export class AiSuggestionsPanelComponent implements OnChanges, OnDestroy {
       (s) => s.type === AISuggestionType.Correspondent
     )
     if (correspondentSuggestions.length > 0) {
-      this.correspondentService.listAll().pipe(takeUntil(this.destroy$)).subscribe((correspondents) => {
-        this.correspondents = correspondents.results
-        this.updateSuggestionLabels()
-      })
+      this.correspondentService
+        .listAll()
+        .pipe(
+          takeUntil(this.destroy$),
+          catchError((error) => {
+            console.error('Failed to load correspondents:', error)
+            return of({ results: [] })
+          })
+        )
+        .subscribe((correspondents) => {
+          this.correspondents = correspondents.results
+          this.updateSuggestionLabels()
+        })
     }
 
     // Load document types if needed
@@ -156,10 +174,19 @@ export class AiSuggestionsPanelComponent implements OnChanges, OnDestroy {
       (s) => s.type === AISuggestionType.DocumentType
     )
     if (documentTypeSuggestions.length > 0) {
-      this.documentTypeService.listAll().pipe(takeUntil(this.destroy$)).subscribe((documentTypes) => {
-        this.documentTypes = documentTypes.results
-        this.updateSuggestionLabels()
-      })
+      this.documentTypeService
+        .listAll()
+        .pipe(
+          takeUntil(this.destroy$),
+          catchError((error) => {
+            console.error('Failed to load document types:', error)
+            return of({ results: [] })
+          })
+        )
+        .subscribe((documentTypes) => {
+          this.documentTypes = documentTypes.results
+          this.updateSuggestionLabels()
+        })
     }
 
     // Load storage paths if needed
@@ -167,10 +194,19 @@ export class AiSuggestionsPanelComponent implements OnChanges, OnDestroy {
       (s) => s.type === AISuggestionType.StoragePath
     )
     if (storagePathSuggestions.length > 0) {
-      this.storagePathService.listAll().pipe(takeUntil(this.destroy$)).subscribe((storagePaths) => {
-        this.storagePaths = storagePaths.results
-        this.updateSuggestionLabels()
-      })
+      this.storagePathService
+        .listAll()
+        .pipe(
+          takeUntil(this.destroy$),
+          catchError((error) => {
+            console.error('Failed to load storage paths:', error)
+            return of({ results: [] })
+          })
+        )
+        .subscribe((storagePaths) => {
+          this.storagePaths = storagePaths.results
+          this.updateSuggestionLabels()
+        })
     }
 
     // Load custom fields if needed
@@ -178,10 +214,19 @@ export class AiSuggestionsPanelComponent implements OnChanges, OnDestroy {
       (s) => s.type === AISuggestionType.CustomField
     )
     if (customFieldSuggestions.length > 0) {
-      this.customFieldsService.listAll().pipe(takeUntil(this.destroy$)).subscribe((customFields) => {
-        this.customFields = customFields.results
-        this.updateSuggestionLabels()
-      })
+      this.customFieldsService
+        .listAll()
+        .pipe(
+          takeUntil(this.destroy$),
+          catchError((error) => {
+            console.error('Failed to load custom fields:', error)
+            return of({ results: [] })
+          })
+        )
+        .subscribe((customFields) => {
+          this.customFields = customFields.results
+          this.updateSuggestionLabels()
+        })
     }
   }
 

src-ui/src/app/services/ai-status.service.ts

@@ -1,6 +1,6 @@
 import { HttpClient } from '@angular/common/http'
 import { Injectable, inject } from '@angular/core'
-import { BehaviorSubject, Observable, interval, Subscription } from 'rxjs'
+import { BehaviorSubject, Observable, interval, Subscription, of } from 'rxjs'
 import { catchError, map, startWith, switchMap } from 'rxjs/operators'
 import { AIStatus } from 'src/app/data/ai-status'
 import { environment } from 'src/environments/environment'
@@ -86,19 +86,15 @@ export class AIStatusService {
         }),
         catchError((error) => {
           this.loading = false
-          console.warn('Failed to fetch AI status, using mock data:', error)
-          // Return mock data if endpoint doesn't exist yet
-          return [
-            {
-              active: true,
-              processing: false,
-              documents_scanned_today: 42,
-              suggestions_applied: 15,
-              pending_deletion_requests: 2,
-              last_scan: new Date().toISOString(),
-              version: '1.0.0',
-            },
-          ]
+          console.warn('Failed to fetch AI status:', error)
+          // Return default status if endpoint fails
+          return of({
+            active: false,
+            processing: false,
+            documents_scanned_today: 0,
+            suggestions_applied: 0,
+            pending_deletion_requests: 0,
+          })
         })
       )
   }