feat: integrate ConnectionManager into Handler struct

Add WebSocket ConnectionManager to Handler:
- Add connManager field to Handler struct
- Update NewHandler to accept ConnectionManager parameter
- Update SetupRoutes to pass ConnectionManager through
- Import sync package with alias to avoid conflicts

This enables progress handlers to broadcast updates via WebSocket.

internal/handlers/progress.go

@@ -2,7 +2,7 @@ package handlers
 
 import (
 	"bookmann/internal/database"
-	"bookmann/internal/sync"
+	wsync "bookmann/internal/sync"
 	"context"
 	"net/http"
 	"strconv"
@@ -118,7 +118,7 @@ func (h *Handler) UpdateUniversalProgress(c echo.Context) error {
 	if req.Location.Percentage != nil {
 		percentage = *req.Location.Percentage
 	} else if req.Location.Page != nil && req.Location.TotalPages != nil {
-		percentage = sync.PageToPercentage(*req.Location.Page, *req.Location.TotalPages)
+		percentage = wsync.PageToPercentage(*req.Location.Page, *req.Location.TotalPages)
 	}
 
 	currentPage := 0
@@ -171,6 +171,20 @@ func (h *Handler) UpdateUniversalProgress(c echo.Context) error {
 		return echo.NewHTTPError(http.StatusInternalServerError, "failed to update progress")
 	}
 
+	// Broadcast progress update to all connected WebSocket clients
+	deviceName := "Web"
+	deviceType := "web"
+	if req.DeviceMetadata.DeviceType != "" {
+		deviceType = req.DeviceMetadata.DeviceType
+		deviceName = req.DeviceMetadata.DeviceType
+	}
+
+	h.connManager.BroadcastProgressUpdate(mediaItemID, percentage, wsync.SourceDevice{
+		ID:   uuid.UUID(user.ID.Bytes).String(),
+		Name: deviceName,
+		Type: deviceType,
+	})
+
 	return c.JSON(http.StatusOK, map[string]interface{}{
 		"sync_status":      "success",
 		"progress_updated": true,