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/runner/runner.go

@@ -503,9 +503,21 @@ func (r *Runner) runScrapeTask(ctx context.Context, task domain.ScrapeTask) {
 	if result.ErrorMessage != "" {
 		r.tasksFailed.Add(1)
 		span.SetStatus(codes.Error, result.ErrorMessage)
+		if r.deps.Notifier != nil {
+			_ = r.deps.Notifier.CreateNotification(ctx, "admin",
+				"Scrape Failed",
+				fmt.Sprintf("Scrape task (%s) failed: %s", task.Kind, result.ErrorMessage),
+				"/admin/tasks")
+		}
 	} else {
 		r.tasksCompleted.Add(1)
 		span.SetStatus(codes.Ok, "")
+		if r.deps.Notifier != nil {
+			_ = r.deps.Notifier.CreateNotification(ctx, "admin",
+				"Scrape Complete",
+				fmt.Sprintf("Scraped %d chapters, skipped %d (%s)", result.ChaptersScraped, result.ChaptersSkipped, task.Kind),
+				"/admin/tasks")
+		}
 	}
 
 	log.Info("runner: scrape task finished",
@@ -585,6 +597,12 @@ func (r *Runner) runAudioTask(ctx context.Context, task domain.AudioTask) {
 		if err := r.deps.Consumer.FinishAudioTask(ctx, task.ID, result); err != nil {
 			log.Error("runner: FinishAudioTask failed", "err", err)
 		}
+		if r.deps.Notifier != nil {
+			_ = r.deps.Notifier.CreateNotification(ctx, "admin",
+				"Audio Failed",
+				fmt.Sprintf("Ch.%d of %s (%s): %s", task.Chapter, task.Slug, task.Voice, msg),
+				fmt.Sprintf("/books/%s", task.Slug))
+		}
 	}
 
 	raw, err := r.deps.BookReader.ReadChapter(ctx, task.Slug, task.Chapter)
@@ -649,6 +667,12 @@ func (r *Runner) runAudioTask(ctx context.Context, task domain.AudioTask) {
 	if err := r.deps.Consumer.FinishAudioTask(ctx, task.ID, result); err != nil {
 		log.Error("runner: FinishAudioTask failed", "err", err)
 	}
+	if r.deps.Notifier != nil {
+		_ = r.deps.Notifier.CreateNotification(ctx, "admin",
+			"Audio Ready",
+			fmt.Sprintf("Ch.%d of %s (%s) is ready", task.Chapter, task.Slug, task.Voice),
+			fmt.Sprintf("/books/%s", task.Slug))
+	}
 	log.Info("runner: audio task finished", "key", key)
 }
 

backend/internal/runner/translation.go

@@ -53,6 +53,12 @@ func (r *Runner) runTranslationTask(ctx context.Context, task domain.Translation
 		if err := r.deps.Consumer.FinishTranslationTask(ctx, task.ID, result); err != nil {
 			log.Error("runner: FinishTranslationTask failed", "err", err)
 		}
+		if r.deps.Notifier != nil {
+			_ = r.deps.Notifier.CreateNotification(ctx, "admin",
+				"Translation Failed",
+				fmt.Sprintf("Ch.%d of %s (%s): %s", task.Chapter, task.Slug, task.Lang, msg),
+				fmt.Sprintf("/books/%s", task.Slug))
+		}
 	}
 
 	// Guard: LibreTranslate must be configured.
@@ -93,5 +99,11 @@ func (r *Runner) runTranslationTask(ctx context.Context, task domain.Translation
 	if err := r.deps.Consumer.FinishTranslationTask(ctx, task.ID, result); err != nil {
 		log.Error("runner: FinishTranslationTask failed", "err", err)
 	}
+	if r.deps.Notifier != nil {
+		_ = r.deps.Notifier.CreateNotification(ctx, "admin",
+			"Translation Ready",
+			fmt.Sprintf("Ch.%d of %s translated to %s", task.Chapter, task.Slug, task.Lang),
+			fmt.Sprintf("/books/%s", task.Slug))
+	}
 	log.Info("runner: translation task finished", "key", key)
 }