v2.6.50: notifications overhaul, fix blank page, fix chapter review loading

- svelte.config.js: paths.relative=false so CSS uses absolute /_app/ paths (fixes blank home page after redirect)
- ai-jobs: fix openReview() mutating stale alias r instead of $state review — was causing 'Loading results...' to never resolve for chapter-names/image-gen/description
- notifications bell: redesign with All/Unread tabs, per-item dismiss (×), mark-all-read, clear-all, 'View all' footer link
- /admin/notifications: new dedicated full-page notifications view
- api/notifications proxy: add PATCH (mark-all-read) and DELETE (clear-all, dismiss) handlers
- runner: add CreateNotification calls on success/failure in runScrapeTask, runAudioTask, runTranslationTask
- storage/import.go: real PDF (dslipak/pdf) and EPUB (archive/zip + x/net/html) parsing replacing stubs
- translation admin page: stream jobs Promise instead of blocking navigation
- store.go: DeleteNotification, ClearAllNotifications, MarkAllNotificationsRead methods
- handlers_notifications.go + server.go: PATCH /api/notifications, DELETE /api/notifications, DELETE /api/notifications/{id}

backend/internal/backend/handlers_notifications.go

@@ -7,6 +7,63 @@ import (
 	"github.com/libnovel/backend/internal/storage"
 )
 
+// handleDismissNotification handles DELETE /api/notifications/{id}.
+func (s *Server) handleDismissNotification(w http.ResponseWriter, r *http.Request) {
+	id := r.PathValue("id")
+	if id == "" {
+		jsonError(w, http.StatusBadRequest, "notification id required")
+		return
+	}
+	store, ok := s.deps.Producer.(*storage.Store)
+	if !ok {
+		jsonError(w, http.StatusInternalServerError, "storage not available")
+		return
+	}
+	if err := store.DeleteNotification(r.Context(), id); err != nil {
+		jsonError(w, http.StatusInternalServerError, "dismiss notification: "+err.Error())
+		return
+	}
+	writeJSON(w, 0, map[string]any{"success": true})
+}
+
+// handleClearAllNotifications handles DELETE /api/notifications?user_id=...
+func (s *Server) handleClearAllNotifications(w http.ResponseWriter, r *http.Request) {
+	userID := r.URL.Query().Get("user_id")
+	if userID == "" {
+		jsonError(w, http.StatusBadRequest, "user_id required")
+		return
+	}
+	store, ok := s.deps.Producer.(*storage.Store)
+	if !ok {
+		jsonError(w, http.StatusInternalServerError, "storage not available")
+		return
+	}
+	if err := store.ClearAllNotifications(r.Context(), userID); err != nil {
+		jsonError(w, http.StatusInternalServerError, "clear notifications: "+err.Error())
+		return
+	}
+	writeJSON(w, 0, map[string]any{"success": true})
+}
+
+// handleMarkAllNotificationsRead handles PATCH /api/notifications?user_id=...
+func (s *Server) handleMarkAllNotificationsRead(w http.ResponseWriter, r *http.Request) {
+	userID := r.URL.Query().Get("user_id")
+	if userID == "" {
+		jsonError(w, http.StatusBadRequest, "user_id required")
+		return
+	}
+	store, ok := s.deps.Producer.(*storage.Store)
+	if !ok {
+		jsonError(w, http.StatusInternalServerError, "storage not available")
+		return
+	}
+	if err := store.MarkAllNotificationsRead(r.Context(), userID); err != nil {
+		jsonError(w, http.StatusInternalServerError, "mark all read: "+err.Error())
+		return
+	}
+	writeJSON(w, 0, map[string]any{"success": true})
+}
+
 type notification struct {
 	ID      string `json:"id"`
 	UserID  string `json:"user_id"`

backend/internal/backend/server.go

@@ -251,7 +251,10 @@ func (s *Server) ListenAndServe(ctx context.Context) error {
 
 	// Notifications
 	mux.HandleFunc("GET /api/notifications", s.handleListNotifications)
+	mux.HandleFunc("PATCH /api/notifications", s.handleMarkAllNotificationsRead)
 	mux.HandleFunc("PATCH /api/notifications/{id}", s.handleMarkNotificationRead)
+	mux.HandleFunc("DELETE /api/notifications", s.handleClearAllNotifications)
+	mux.HandleFunc("DELETE /api/notifications/{id}", s.handleDismissNotification)
 
 	// Voices list
 	mux.HandleFunc("GET /api/voices", s.handleVoices)