fix(auth,download): playlists/likes 401, suppression downloads, 429 formats

- likes + playlists: authMiddlewareCookieAware (cookies + Bearer) au lieu
  du Bearer seul -> corrige 401 Unauthorized meme connecte (creation
  playlist, ajout video, bouton J'aime)
- add-to-playlist/like-button/search-box: retire HttpClientModule local
  qui court-circuitait les intercepteurs fonctionnels
- intercepteur: refresh+retry sur 401 meme sans token en memoire (F5)
- UserService: apiBase() au lieu de /proxy/api en dur (prod :4000)
- J'aime: envoie titre/miniature, erreur visible au lieu de bouton mort
- download: seaux separes (lectures 120/min, ecritures 30/min, formats
  30/min) + reponses limiter en JSON rate_limited + Retry-After
- formats: cache memoire 10 min + ytdlpNetOpts + retry front avec backoff
- polling allege (downloads 5s, suivi job 4s, 429 transitoire non fatal)
- erreurs FR precises (http-error.util): 401/403/404/410/429/quota/500
  avec compte a rebours + bouton Reessayer

src/components/library/downloads/downloads.component.ts

@@ -3,6 +3,7 @@ import { CommonModule } from '@angular/common';
 import { RouterLink } from '@angular/router';
 import { DownloadService, type DownloadJob, type DownloadQuota } from '../../../services/download.service';
 import { AuthService } from '../../../services/auth.service';
+import { frenchDownloadError } from '../../../utils/http-error.util';
 import { TranslatePipe } from '../../../pipes/translate.pipe';
 import { ProviderBadgeComponent } from '../../../app/shared/components/provider-badge/provider-badge.component';
 
@@ -88,14 +89,15 @@ export class DownloadsComponent {
   retry(job: DownloadJob): void {
     if (this.busyIds().has(job.id)) return;
     this.markBusy(job.id, true);
+    this.error.set(null);
     this.downloads.retryJob(job.id).subscribe({
       next: () => {
         this.markBusy(job.id, false);
         this.reload();
       },
-      error: () => {
+      error: (err) => {
         this.markBusy(job.id, false);
-        this.error.set('Nouvel essai impossible pour le moment.');
+        this.error.set(frenchDownloadError(err));
       },
     });
   }
@@ -103,14 +105,16 @@ export class DownloadsComponent {
   cancel(job: DownloadJob): void {
     if (this.busyIds().has(job.id)) return;
     this.markBusy(job.id, true);
+    this.error.set(null);
     this.downloads.cancelJob(job.id).subscribe({
       next: () => {
         this.markBusy(job.id, false);
         this.items.update((list) => list.filter((j) => j.id !== job.id));
+        this.syncPoller();
       },
-      error: () => {
+      error: (err) => {
         this.markBusy(job.id, false);
-        this.error.set('Suppression impossible pour le moment.');
+        this.error.set(frenchDownloadError(err));
       },
     });
   }
@@ -188,7 +192,9 @@ export class DownloadsComponent {
   private syncPoller(): void {
     const hasActive = this.items().some((j) => ACTIVE_STATES.has(j.state));
     if (hasActive && !this.poller) {
-      this.poller = setInterval(() => this.refreshActive(), 3000);
+      // 5 s : le polling agressif (3 s) saturait à lui seul le seau
+      // anti-abus et affamait suppressions + formats (429).
+      this.poller = setInterval(() => this.refreshActive(), 5000);
     } else if (!hasActive && this.poller) {
       clearInterval(this.poller);
       this.poller = null;

src/components/search/search-box.component.ts

@@ -1,28 +1,36 @@
 import { Component, EventEmitter, Output, Input, signal, computed, effect, inject, HostListener, ViewChild, ElementRef } from '@angular/core';
 import { CommonModule } from '@angular/common';
 import { FormsModule } from '@angular/forms';
-import { HttpClientModule } from '@angular/common/http';
 import { ProviderId, PROVIDERS } from '../../app/core/providers/provider-registry';
 import { ProviderPickerComponent } from './provider-picker.component';
 import { SearchService } from '../../app/search/search.service';
 import { UserService, type UserPreferences } from '../../services/user.service';
 import { HistoryService, type SearchHistoryItem } from '../../services/history.service';
 import { TelemetryService } from '../../services/telemetry.service';
-import { Subject } from 'rxjs';
-import { debounceTime, distinctUntilChanged } from 'rxjs/operators';
+import { Subject, of } from 'rxjs';
+import { debounceTime, distinctUntilChanged, switchMap, catchError, finalize } from 'rxjs/operators';
 import { takeUntilDestroyed } from '@angular/core/rxjs-interop';
+import { SuggestService } from '../../app/search/suggest.service';
+import { mergeGroups, highlightParts } from '../../app/search/suggest.util';
 // No overlays; we render fixed-position modals with high z-index
 
 const AT_QUERY_RE = /(^|\s)@([a-z]{1,24})$/i;
 
+/** One row of the Step 15 typeahead panel (provider null = recent search). */
+export interface SuggestFlatItem {
+  text: string;
+  provider: string | null;
+}
+
 @Component({
   selector: 'app-search-box',
   standalone: true,
+  // NOTE : HttpClient est fourni à la racine (intercepteurs inclus) : ne pas
+  // importer HttpClientModule ici (écraserait les intercepteurs -> 401).
   imports: [
     CommonModule,
     FormsModule,
-    ProviderPickerComponent,
-    HttpClientModule  // Nécessaire pour SearchService
+    ProviderPickerComponent
   ],
   providers: [
     SearchService,  // Fournir le service au niveau du composant
@@ -36,6 +44,8 @@ export class SearchBoxComponent {
   private users = inject(UserService);
   private history = inject(HistoryService);
   private telemetry = inject(TelemetryService);
+  // Optional: keeps unit tests (which don't provide it) working with a null guard
+  private suggestSvc = inject(SuggestService, { optional: true });
   @ViewChild('qInput', { static: false }) qInputRef?: ElementRef<HTMLInputElement>;
   @ViewChild('quickDialog', { static: false }) quickDialogRef?: ElementRef<HTMLDivElement>;
 
@@ -66,6 +76,29 @@ export class SearchBoxComponent {
   quickOpen = signal(false);
   recentSearches = signal<SearchHistoryItem[]>([]);
 
+  // Step 15 — query typeahead (suggestions de requêtes, avant validation).
+  // `suggestionsOpen` doubles as the typeahead panel flag (closed when @ popover opens).
+  suggestLoading = signal(false);
+  suggestGroups = signal<Record<string, string[]>>({});
+  recentSuggest = signal<string[]>([]);
+  suggestIndex = signal(-1);
+  private allRecentCache: string[] = [];
+  private lastRecentFetch = 0;
+  private suggestShownFor: string | null = null;
+  readonly suggestFlat = computed((): SuggestFlatItem[] => {
+    const q = this.query();
+    const recents = (this.recentSuggest() || []).slice(0, 5).map((t) => ({ text: t, provider: null as string | null }));
+    const seen = new Set(recents.map((r) => r.text.toLowerCase()));
+    const merged = mergeGroups(this.suggestGroups() || {}).filter((m) => {
+      const k = m.text.toLowerCase();
+      if (seen.has(k)) return false;
+      seen.add(k);
+      return true;
+    });
+    void q;
+    return [...recents, ...merged].slice(0, 15);
+  });
+
   // Element to restore focus to when a modal closes (a11y)
   private lastFocused: HTMLElement | null = null;
 
@@ -88,6 +121,15 @@ export class SearchBoxComponent {
       this.searchChange.emit((value || '').trim());
     });
 
+    // Step 15 — debounced typeahead fetch; switchMap cancels the in-flight
+    // request on each keystroke so a slow response never overwrites the latest.
+    this._suggestReq.pipe(
+      debounceTime(250),
+      distinctUntilChanged(),
+      switchMap((value) => this.fetchSuggest(value)),
+      takeUntilDestroyed()
+    ).subscribe((res) => this.applySuggestResponse(res));
+
     // Reflect SearchService into local state to restore from URL/preference
     effect(() => {
       if (hydratedFromService) return; // only hydrate once
@@ -152,6 +194,115 @@ export class SearchBoxComponent {
     const hasOptions = this.atOptions().length > 0;
     this.atOpen.set(AT_QUERY_RE.test(value) && hasOptions);
     if (this.atIndex() >= this.atOptions().length) this.atIndex.set(0);
+    // Step 15 — typeahead has lower priority than the @ popover
+    if (this.atOpen()) {
+      this.suggestionsOpen.set(false);
+      this.suggestIndex.set(-1);
+    } else {
+      this.refreshRecentSuggest(value);
+      this._suggestReq.next(value);
+    }
+  }
+
+  // --- Step 15 helpers ---
+
+  private fetchSuggest(value: string) {
+    const q = String(value || '').trim();
+    if (!this.suggestSvc || q.length < 2 || this.atOpen()) {
+      return of(null);
+    }
+    const prov = this.providersForRequest();
+    const providers = Array.isArray(prov) ? prov : undefined;
+    this.suggestLoading.set(true);
+    return this.suggestSvc.suggestOnce(q, providers, 10).pipe(
+      catchError(() => of({ q, groups: {} as Record<string, string[]> })),
+      finalize(() => this.suggestLoading.set(false)),
+    );
+  }
+
+  private applySuggestResponse(res: { q: string; groups: Record<string, string[]> } | null) {
+    if (!res) {
+      this.suggestGroups.set({});
+      this.suggestionsOpen.set(false);
+      this.suggestIndex.set(-1);
+      return;
+    }
+    this.suggestGroups.set(res.groups || {});
+    this.refreshRecentSuggest(this.query());
+    const flat = this.suggestFlat();
+    if (flat.length > 0) {
+      this.suggestionsOpen.set(true);
+      this.suggestIndex.set(-1);
+      const key = String(res.q || '').toLowerCase();
+      if (this.suggestShownFor !== key) {
+        this.suggestShownFor = key;
+        this.telemetry.track('suggest_shown', { queryLength: key.length, resultCount: flat.length });
+      }
+    } else {
+      this.suggestionsOpen.set(false);
+      this.suggestIndex.set(-1);
+    }
+  }
+
+  /** Filter cached history synchronously; refresh the cache at most every 10s. */
+  private refreshRecentSuggest(value: string) {
+    const q = String(value || '').trim().toLowerCase();
+    if (q.length >= 2 && this.allRecentCache.length > 0) {
+      this.recentSuggest.set(this.allRecentCache.filter((t) => t.toLowerCase().includes(q)).slice(0, 5));
+    } else if (q.length < 2) {
+      this.recentSuggest.set([]);
+    }
+    const now = Date.now();
+    if (q.length < 2 || now - this.lastRecentFetch < 10_000) return;
+    this.lastRecentFetch = now;
+    try {
+      this.history.getSearchHistory(15).subscribe({
+        next: (items) => {
+          this.allRecentCache = (items || []).map((i) => String(i?.query || '').trim()).filter(Boolean);
+          const cur = String(this.query() || '').trim().toLowerCase();
+          if (cur.length >= 2) {
+            this.recentSuggest.set(this.allRecentCache.filter((t) => t.toLowerCase().includes(cur)).slice(0, 5));
+          }
+        },
+        error: () => {},
+      });
+    } catch {}
+  }
+
+  /** Fill the input with a suggestion; submit=true also runs the search. */
+  applySuggestion(text: string, submit: boolean) {
+    const t = String(text || '').trim();
+    if (!t) return;
+    const prov = this.providersForRequest();
+    this.telemetry.track('suggest_used', { providers: Array.isArray(prov) ? prov : ['all'], queryLength: t.length });
+    this.suggestionsOpen.set(false);
+    this.suggestIndex.set(-1);
+    this.query.set(t);
+    try { this.search.q$.next(t); } catch {}
+    try { this.qInputRef?.nativeElement && (this.qInputRef.nativeElement.value = t); } catch {}
+    if (submit) {
+      this.submitted.emit({ q: t, providers: this.providersForRequest() });
+      this.telemetry.track('search_submit', { providers: Array.isArray(prov) ? prov : ['all'], queryLength: t.length });
+    } else {
+      this._suggestReq.next(t);
+    }
+    try { this.qInputRef?.nativeElement?.focus(); } catch {}
+  }
+
+  suggestHighlight(text: string): { pre: string; match: string; post: string } {
+    return highlightParts(text, this.query());
+  }
+
+  providerBadge(pid: string | null): string {
+    if (!pid) return '';
+    const found = PROVIDERS.find((p) => p.id === (pid as ProviderId));
+    return found ? found.shortLabel : String(pid).toUpperCase();
+  }
+
+  onSuggestInputFocus() {
+    if (!this.atOpen() && String(this.query() || '').trim().length >= 2 && this.suggestFlat().length > 0) {
+      this.suggestionsOpen.set(true);
+    }
   }
 
   // Pick an option from the inline '@' popover: strip the '@term' and toggle the chip
@@ -205,6 +356,47 @@ export class SearchBoxComponent {
       }
       if (ev.key === 'Escape') { this.atOpen.set(false); return; }
     }
+    // Step 15 — typeahead navigation (second priority after the @ popover)
+    if (this.suggestionsOpen() && !this.atOpen()) {
+      const flat = this.suggestFlat();
+      if (flat.length > 0) {
+        const last = flat.length - 1;
+        if (ev.key === 'ArrowDown') {
+          ev.preventDefault();
+          this.suggestIndex.set(this.suggestIndex() >= last ? 0 : this.suggestIndex() + 1);
+          return;
+        }
+        if (ev.key === 'ArrowUp') {
+          ev.preventDefault();
+          this.suggestIndex.set(this.suggestIndex() <= 0 ? last : this.suggestIndex() - 1);
+          return;
+        }
+        if (ev.key === 'Enter') {
+          const idx = this.suggestIndex();
+          if (idx >= 0 && idx <= last) {
+            ev.stopImmediatePropagation();
+            ev.preventDefault();
+            this.applySuggestion(flat[idx].text, true);
+            return;
+          }
+        }
+        // Tab completes the active (or first) suggestion without searching
+        if (ev.key === 'Tab') {
+          const idx = this.suggestIndex() >= 0 ? this.suggestIndex() : 0;
+          if (flat[idx]) {
+            ev.preventDefault();
+            this.applySuggestion(flat[idx].text, false);
+            return;
+          }
+        }
+      }
+      // Esc closes the panel but keeps the typed text
+      if (ev.key === 'Escape') {
+        this.suggestionsOpen.set(false);
+        this.suggestIndex.set(-1);
+        return;
+      }
+    }
     // Alt+1..6 map to chips by registry order
     if (ev.altKey) {
       const map: Record<string, ProviderId | undefined> = { '1': 'yt', '2': 'dm', '3': 'tw', '4': 'pt', '5': 'od', '6': 'ru' };
@@ -250,6 +442,8 @@ export class SearchBoxComponent {
 
   onSubmit(ev: Event) {
     try { ev.preventDefault(); } catch {}
+    this.suggestionsOpen.set(false);
+    this.suggestIndex.set(-1);
     let q = (this.query() || '').trim();
     if ((!q || q.length === 0) && this.qInputRef?.nativeElement) {
       try {
@@ -355,4 +549,6 @@ export class SearchBoxComponent {
 
   // Internal subject for debouncing query changes
   private _qChanges = new Subject<string>();
+  // Internal subject for debounced typeahead fetches (Step 15)
+  private _suggestReq = new Subject<string>();
 }

src/components/shared/components/add-to-playlist/add-to-playlist.component.ts

@@ -1,6 +1,5 @@
 import { ChangeDetectionStrategy, Component, Input, OnDestroy, OnInit, inject, signal, HostListener } from '@angular/core';
 import { CommonModule } from '@angular/common';
-import { HttpClientModule } from '@angular/common/http';
 import { PlaylistsService, Playlist } from '../../../../services/playlists.service';
 import { AuthService } from '../../../../services/auth.service';
 import { forkJoin } from 'rxjs';
@@ -8,7 +7,10 @@ import { forkJoin } from 'rxjs';
 @Component({
   selector: 'app-add-to-playlist',
   standalone: true,
-  imports: [CommonModule, HttpClientModule],
+  // NOTE : ne pas importer HttpClientModule ici : fourni à la racine via
+  // provideHttpClient(withInterceptors(...)), un import local créerait un
+  // HttpClient sans intercepteurs (plus de Bearer/refresh -> 401).
+  imports: [CommonModule],
   template: `
   <div class="relative inline-block text-left" (click)="$event.stopPropagation();">
     <button (click)="toggleOpen($event)"

src/components/shared/components/like-button/like-button.component.ts

@@ -2,13 +2,13 @@ import { ChangeDetectionStrategy, Component, Input, OnChanges, OnDestroy, OnInit
 import { CommonModule } from '@angular/common';
 import { LikesService } from '../../../../services/likes.service';
 import { finalize } from 'rxjs';
-import { HttpClientModule } from '@angular/common/http';
 import { AuthService } from '../../../../services/auth.service';
 
 @Component({
   selector: 'app-like-button',
   standalone: true,
-  imports: [CommonModule, HttpClientModule],
+  // NOTE : ne pas importer HttpClientModule ici (voir add-to-playlist).
+  imports: [CommonModule],
   // Le service est déjà fourni via providedIn: 'root' dans le service
   template: `
     @if (isAuthenticated()) {

src/components/watch/watch.component.html

@@ -149,6 +149,9 @@
                 </svg>
                 <span>{{ liked() ? 'Aimée' : 'J\'aime' }}</span>
               </button>
+              @if (likeError(); as lerr) {
+                <span class="text-xs text-red-300" role="alert">{{ lerr }}</span>
+              }
             }
             @if (isLoggedIn()) {
               <app-add-to-playlist [provider]="provider()" [videoId]="v.videoId" [title]="v.title" [thumbnail]="v.thumbnail"></app-add-to-playlist>
@@ -277,7 +280,12 @@
               }
             }
             @if (downloadError() && !formatsLoading()) {
-              <div class="mt-3 text-sm text-red-300" role="alert">{{ downloadError() }}</div>
+              <div class="mt-3 flex flex-wrap items-center gap-3" role="alert">
+                <span class="text-sm text-red-300">{{ downloadError() }}</span>
+                <button (click)="retryFormats()" class="rounded-full bg-slate-700 px-3 py-1 text-xs font-semibold text-slate-200 transition hover:bg-slate-600 focus:outline-none focus-visible:ring-2 focus-visible:ring-red-400">
+                  Réessayer
+                </button>
+              </div>
             }
           </section>
         }

src/components/watch/watch.component.ts

@@ -20,6 +20,7 @@ import { SubscribeButtonComponent } from '../../app/shared/components/subscribe-
 import { DomSanitizer, SafeResourceUrl } from '@angular/platform-browser';
 import { IframeProgressService } from '../../services/iframe-progress.service';
 import { formatAbsoluteFr, formatNumberFr } from '../../utils/date.util';
+import { frenchDownloadError } from '../../utils/http-error.util';
 import { ProviderBadgeComponent } from '../../app/shared/components/provider-badge/provider-badge.component';
 import { ChannelIdentityComponent } from '../../app/shared/components/channel-identity/channel-identity.component';
 import { DurationPipe } from '../../app/shared/pipes/duration.pipe';
@@ -289,6 +290,7 @@ export class WatchComponent implements OnDestroy, AfterViewInit {
   // --- Like state ---
   liked = signal<boolean>(false);
   likeBusy = signal<boolean>(false);
+  likeError = signal<string | null>(null);
 
   // --- Transcript state (Phase 2: display + search + click-to-seek + auto-scroll) ---
   transcriptOpen = signal(false);
@@ -547,30 +549,43 @@ export class WatchComponent implements OnDestroy, AfterViewInit {
   // Toggle like status for the current video
   toggleLike(): void {
     if (!this.isLoggedIn()) return;
-    
+
     const provider = this.provider();
     const videoId = this.videoId();
     if (!provider || !videoId || this.likeBusy()) return;
-    
+
     this.likeBusy.set(true);
-    
-    const handleError = () => {
+    this.likeError.set(null);
+
+    const handleError = (err: unknown) => {
       this.likeBusy.set(false);
+      const status = (err as { status?: number })?.status;
+      this.likeError.set(
+        status === 401
+          ? "Session expirée. Reconnectez-vous puis réessayez."
+          : "Impossible d’enregistrer votre avis pour le moment. Réessayez."
+      );
     };
-    
+
+    // Titre + miniature connus : évite l'enrichissement serveur lent (yt-dlp).
+    const v = this.video();
+    const title = v?.title || undefined;
+    const thumbnail = v?.thumbnail || undefined;
     if (this.liked()) {
       this.likes.unlike(provider, videoId).subscribe({
         next: () => {
           this.liked.set(false);
           this.likeBusy.set(false);
+          this.likeError.set(null);
         },
         error: handleError
       });
     } else {
-      this.likes.like(provider, videoId).subscribe({
+      this.likes.like(provider, videoId, title, thumbnail).subscribe({
         next: () => {
           this.liked.set(true);
           this.likeBusy.set(false);
+          this.likeError.set(null);
         },
         error: handleError
       });
@@ -634,6 +649,7 @@ export class WatchComponent implements OnDestroy, AfterViewInit {
     // Reset like state while loading
     this.liked.set(false);
     this.likeBusy.set(false);
+    this.likeError.set(null);
     const provider = this.provider();
     if (provider === 'rumble') {
       // Validate and enrich Rumble video via backend scraping (may also normalize id)
@@ -1261,11 +1277,20 @@ export class WatchComponent implements OnDestroy, AfterViewInit {
 
   // --- Download logic ---
   openDownloadPanel() {
+    // Anti double-clic : ne recharge pas si le panneau est déjà ouvert.
+    if (this.downloadOpen() && (this.formatsLoading() || this.downloadFormats().length > 0)) return;
     this.downloadOpen.set(true);
     this.downloadError.set(null);
     this.loadFormats();
   }
 
+  /** Nouveau essai manuel depuis le panneau (bouton « Réessayer »). */
+  retryFormats(): void {
+    if (this.formatsLoading()) return;
+    this.downloadError.set(null);
+    this.loadFormats();
+  }
+
   closeDownloadPanel() {
     this.downloadOpen.set(false);
   }
@@ -1303,8 +1328,9 @@ export class WatchComponent implements OnDestroy, AfterViewInit {
   loadFormats() {
     const p = this.provider();
     const id = this.videoId();
-    if (!p || !id) return;
+    if (!p || !id || this.formatsLoading()) return;
     this.formatsLoading.set(true);
+    this.downloadError.set(null);
     this.downloads.listFormats(p, id, this.buildProviderOpts()).subscribe({
       next: (res) => {
         const list = (res?.formats || []).slice();
@@ -1312,14 +1338,12 @@ export class WatchComponent implements OnDestroy, AfterViewInit {
         list.sort((a, b) => (parseInt((b.resolution || '').replace(/[^0-9]/g, '')) || 0) - (parseInt((a.resolution || '').replace(/[^0-9]/g, '')) || 0));
         this.downloadFormats.set(list);
         this.formatsLoading.set(false);
+        if (!list.length) this.downloadError.set('Aucun format disponible pour cette vidéo.');
       },
       error: (err) => {
-        const status = err?.status || 0;
-        if (status === 403) this.downloadError.set('Le téléchargement est désactivé pour ce provider.');
-        else {
-          const details = (err && err.error && (err.error.details || err.error.error)) || err?.message || '';
-          this.downloadError.set(details ? `Impossible de récupérer les formats. (${details})` : 'Impossible de récupérer les formats.');
-        }
+        // Message FR propre (jamais le brut « Http failure response... »),
+        // avec compte à rebours sur les 429 + bouton Réessayer du panneau.
+        this.downloadError.set(frenchDownloadError(err));
         this.formatsLoading.set(false);
       }
     });
@@ -1360,6 +1384,7 @@ export class WatchComponent implements OnDestroy, AfterViewInit {
 
   private pollJob(jobId: string) {
     if (this.jobPoller) clearInterval(this.jobPoller);
+    // 4 s au lieu de 2 s : le polling agressif saturait le seau anti-abus (429).
     this.jobPoller = setInterval(() => {
       this.downloads.getJob(jobId).subscribe({
         next: (job) => {
@@ -1373,14 +1398,18 @@ export class WatchComponent implements OnDestroy, AfterViewInit {
             if (job.state === 'failed') this.downloadError.set(job.error || 'Téléchargement échoué.');
           }
         },
-        error: () => {
-          // Stop polling on error
-          clearInterval(this.jobPoller);
-          this.jobPoller = null;
-          this.downloadError.set('Erreur de suivi du téléchargement.');
+        error: (err) => {
+          // Un 429 transitoire ne doit pas tuer le suivi : on continue le
+          // polling, seule une erreur durable l'arrête (401/403/404).
+          const status = (err as { status?: number })?.status;
+          if (status === 401 || status === 403 || status === 404) {
+            clearInterval(this.jobPoller);
+            this.jobPoller = null;
+            this.downloadError.set(frenchDownloadError(err));
+          }
         }
       });
-    }, 2000);
+    }, 4000);
   }
 
   cancelDownload() {

src/interceptors/auth.interceptor.ts

@@ -33,11 +33,9 @@ export const authInterceptor: HttpInterceptorFn = (req, next) => {
         if (isRefreshCall) {
           return throwError(() => err);
         }
-        // If there is no access token at all, we are not logged in: do not try refresh
-        const hasToken = !!auth.getAccessToken();
-        if (!hasToken) {
-          return throwError(() => err);
-        }
+        // Même sans token en mémoire (ex. juste après F5), une session par
+        // cookies httpOnly peut exister : on tente un refresh via cookies
+        // avant d'abandonner. refresh() n'échoue jamais bruyamment (false).
         // Try a single refresh then retry the request once
         return auth.refresh().pipe(
           switchMap((ok) => {
@@ -47,7 +45,7 @@ export const authInterceptor: HttpInterceptorFn = (req, next) => {
             if (newToken) {
               retry = retry.clone({ setHeaders: { Authorization: `Bearer ${newToken}` } });
             }
-            if (retry.url.startsWith('/proxy/api')) {
+            if (retry.url.startsWith('/proxy/api') || retry.url.startsWith('/api')) {
               retry = retry.clone({ withCredentials: true });
             }
             return next(retry);

src/services/download.service.ts

@@ -1,6 +1,6 @@
 import { Injectable } from '@angular/core';
-import { HttpClient, HttpParams, HttpResponse } from '@angular/common/http';
-import { Observable, map } from 'rxjs';
+import { HttpClient, HttpErrorResponse, HttpParams, HttpResponse } from '@angular/common/http';
+import { Observable, map, retry, timer, throwError } from 'rxjs';
 
 export interface DownloadFormat {
   id: string;
@@ -61,6 +61,19 @@ export class DownloadService {
     return this.http.get<{ url: string; formats: DownloadFormat[]; title: string; duration: number }>(
       `/proxy/api/download/${encodeURIComponent(provider)}/${encodeURIComponent(videoId)}/formats`,
       { params, withCredentials: true }
+    ).pipe(
+      // La liste des formats dépend de yt-dlp/YouTube (parfois 429/5xx
+      // transitoires) : 2 nouveaux essais espacés, jamais sur les 4xx
+      // définitives (401/403/404) pour ne pas marteler le seau anti-abus.
+      retry({
+        count: 2,
+        delay: (err: unknown, retryCount: number) => {
+          const status = (err as HttpErrorResponse)?.status;
+          const retryable = status === 0 || status === 429 || (typeof status === 'number' && status >= 500);
+          if (!retryable) return throwError(() => err);
+          return timer(1500 * retryCount);
+        },
+      })
     );
   }
 

src/services/user.service.ts

@@ -24,19 +24,31 @@ export class UserService {
     return this._preferences();
   }
 
+  /** Même règle que les autres services : /proxy/api en dev (proxy Angular),
+   * /api quand on est servi par le backend :4000 (prod/docker). L'URL codée
+   * en dur cassait loadMe/loadPreferences en prod (-> currentUser null). */
+  private apiBase(): string {
+    try {
+      const port = window?.location?.port || '';
+      return port && port !== '4000' ? '/proxy/api' : '/api';
+    } catch {
+      return '/api';
+    }
+  }
+
   loadPreferences(): Observable<UserPreferences> {
-    return this.http.get<UserPreferences>('/proxy/api/user/preferences', { withCredentials: true }).pipe(
+    return this.http.get<UserPreferences>(`${this.apiBase()}/user/preferences`, { withCredentials: true }).pipe(
       tap(p => this._preferences.set(p || {}))
     );
   }
 
   updatePreferences(patch: Partial<UserPreferences>): Observable<UserPreferences> {
-    return this.http.patch<UserPreferences>('/proxy/api/user/preferences', patch, { withCredentials: true }).pipe(
+    return this.http.patch<UserPreferences>(`${this.apiBase()}/user/preferences`, patch, { withCredentials: true }).pipe(
       tap(p => this._preferences.set(p || {}))
     );
   }
 
   loadMe(): Observable<AuthUser> {
-    return this.http.get<AuthUser>('/proxy/api/user/me', { withCredentials: true });
+    return this.http.get<AuthUser>(`${this.apiBase()}/user/me`, { withCredentials: true });
   }
 }

src/utils/http-error.util.ts

@@ -0,0 +1,79 @@
+import { HttpErrorResponse } from '@angular/common/http';
+
+/** Code d'erreur métier renvoyé par le backend : { error: 'rate_limited', ... }. */
+export function backendErrorCode(err: unknown): string | null {
+  try {
+    const body = (err as HttpErrorResponse)?.error;
+    if (body && typeof body === 'object' && typeof body.error === 'string') return body.error;
+    if (typeof body === 'string') {
+      const m = /"error"\s*:\s*"([a-z_]+)"/i.exec(body);
+      if (m) return m[1];
+    }
+  } catch {}
+  return null;
+}
+
+/**
+ * Secondes avant de réessayer après un 429 : backend { retryAfterSec } >
+ * header Retry-After > header RateLimit-Reset (epoch secondes) > défaut.
+ */
+export function retryAfterSeconds(err: unknown, fallback = 30): number {
+  try {
+    const e = err as HttpErrorResponse;
+    const body = e?.error;
+    if (body && typeof body === 'object' && Number.isFinite(Number(body.retryAfterSec))) {
+      return Math.max(1, Math.ceil(Number(body.retryAfterSec)));
+    }
+    const headers = e?.headers;
+    const retryAfter = headers?.get?.('Retry-After');
+    if (retryAfter && Number.isFinite(Number(retryAfter))) return Math.max(1, Math.ceil(Number(retryAfter)));
+    const reset = headers?.get?.('RateLimit-Reset');
+    if (reset && Number.isFinite(Number(reset))) {
+      const nowSec = Date.now() / 1000;
+      const wait = Math.ceil(Number(reset) - nowSec);
+      if (wait >= 1 && wait <= 3600) return wait;
+    }
+  } catch {}
+  return fallback;
+}
+
+/** Vrai quand l'échec est transitoire et mérite un retry (429 / réseau / 5xx). */
+export function isRetryableStatus(status: number | undefined): boolean {
+  return status === 0 || status === 429 || (typeof status === 'number' && status >= 500 && status < 600);
+}
+
+/**
+ * Message FR prêt à afficher pour les erreurs du module téléchargement.
+ * Ne fuit jamais le corps brut (HTML / « Http failure response... »).
+ */
+export function frenchDownloadError(err: unknown): string {
+  const e = err as HttpErrorResponse;
+  const status = typeof e?.status === 'number' ? e.status : undefined;
+  const code = backendErrorCode(err);
+  if (status === 0) return 'Serveur de téléchargement injoignable. Vérifiez que le backend tourne puis réessayez.';
+  if (status === 401) return 'Session expirée. Reconnectez-vous puis réessayez.';
+  if (status === 403) {
+    if (code === 'download_disabled_for_provider' || code === 'forbidden') {
+      return code === 'forbidden'
+        ? 'Action interdite (ressource d’un autre compte).'
+        : 'Le téléchargement est désactivé pour ce provider.';
+    }
+    return 'Action interdite.';
+  }
+  if (status === 404) return 'Ce téléchargement n’existe plus (déjà supprimé ou autre compte). Actualisez la liste.';
+  if (status === 410) return 'Le fichier n’est plus présent sur le serveur (nettoyé). Relancez un téléchargement.';
+  if (status === 429) {
+    if (code === 'too_many_downloads') return 'Trop de téléchargements en parallèle. Attendez la fin d’un job puis réessayez.';
+    if (code === 'storage_quota_exceeded') return 'Quota de stockage atteint. Supprimez d’anciens fichiers puis réessayez.';
+    const wait = retryAfterSeconds(err);
+    return `Trop de requêtes pour le moment (limite anti-abus). Réessayez dans ~${wait} s.`;
+  }
+  if (status === 400) {
+    if (code === 'job_not_retryable') return 'Ce job ne peut pas être relancé dans son état actuel.';
+    return 'Requête invalide.';
+  }
+  if (code === 'formats_failed' || status === 500) {
+    return 'Impossible de récupérer les formats (service vidéo indisponible). Réessayez dans un instant.';
+  }
+  return 'Opération impossible pour le moment. Réessayez plus tard.';
+}