Fix sync errors for duplicate projects and add modal scrolling

Root cause: Projects with duplicate (code, variant) pairs fail to sync
due to unique constraint on server. Example: multiple "OPS-1934" projects
with variant="Dell" where one already exists on server.

Fixes:
1. Sync service now detects duplicate (code, variant) on server and links
   local project to existing server project instead of failing
2. Local repair checks for duplicate (code, variant) pairs and deduplicates
   by appending UUID suffix to variant
3. Modal now scrollable with fixed header/footer (max-h-90vh)

This allows users to sync projects that were created offline with
conflicting codes/variants without losing data.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

internal/localdb/localdb.go

@@ -1088,7 +1088,9 @@ func (l *LocalDB) RepairPendingChanges() (int, []string, error) {
 	return repaired, remainingErrors, nil
 }
 
-// repairProjectChange validates and fixes project data
+// repairProjectChange validates and fixes project data.
+// Note: This only validates local data. Server-side conflicts (like duplicate code+variant)
+// are handled by sync service layer with deduplication logic.
 func (l *LocalDB) repairProjectChange(change *PendingChange) error {
 	project, err := l.GetProjectByUUID(change.EntityUUID)
 	if err != nil {
@@ -1123,6 +1125,20 @@ func (l *LocalDB) repairProjectChange(change *PendingChange) error {
 		modified = true
 	}
 
+	// Check for local duplicates with same (code, variant)
+	var duplicate LocalProject
+	err = l.db.Where("code = ? AND variant = ? AND uuid != ?", project.Code, project.Variant, project.UUID).
+		First(&duplicate).Error
+	if err == nil {
+		// Found local duplicate - deduplicate by appending UUID suffix to variant
+		if project.Variant == "" {
+			project.Variant = project.UUID[:8]
+		} else {
+			project.Variant = project.Variant + "-" + project.UUID[:8]
+		}
+		modified = true
+	}
+
 	if modified {
 		if err := l.SaveProject(project); err != nil {
 			return fmt.Errorf("saving repaired project: %w", err)

internal/services/sync/service.go

@@ -856,10 +856,29 @@ func (s *Service) pushProjectChange(change *localdb.PendingChange) error {
 		}
 	}
 
-	if err := projectRepo.UpsertByUUID(&project); err != nil {
-		return fmt.Errorf("upsert project on server: %w", err)
+	// Try upsert by UUID first
+	err = projectRepo.UpsertByUUID(&project)
+	if err != nil {
+		// Check if it's a duplicate (code, variant) constraint violation
+		// In this case, find existing project with same (code, variant) and link to it
+		var existing models.Project
+		lookupErr := mariaDB.Where("code = ? AND variant = ?", project.Code, project.Variant).First(&existing).Error
+		if lookupErr == nil {
+			// Found duplicate - link local project to existing server project
+			slog.Info("project duplicate found, linking to existing",
+				"local_uuid", project.UUID,
+				"server_uuid", existing.UUID,
+				"server_id", existing.ID,
+				"code", project.Code,
+				"variant", project.Variant)
+			project.ID = existing.ID
+		} else {
+			// Not a duplicate issue, return original error
+			return fmt.Errorf("upsert project on server: %w", err)
+		}
 	}
 
+	// Update local project with server ID
 	localProject, localErr := s.localDB.GetProjectByUUID(project.UUID)
 	if localErr == nil {
 		if project.ID > 0 {

web/templates/base.html

@@ -45,10 +45,10 @@
     <div id="toast" class="fixed bottom-4 right-4 z-50"></div>
 
     <!-- Sync Info Modal -->
-    <div id="sync-modal" class="fixed inset-0 bg-black bg-opacity-50 flex items-center justify-center z-50 hidden">
-        <div class="bg-white rounded-lg shadow-xl max-w-lg w-full mx-4">
-            <div class="p-6">
-                <div class="flex justify-between items-center mb-4">
+    <div id="sync-modal" class="fixed inset-0 bg-black bg-opacity-50 flex items-center justify-center z-50 hidden p-4">
+        <div class="bg-white rounded-lg shadow-xl max-w-lg w-full max-h-[90vh] flex flex-col">
+            <div class="p-6 border-b border-gray-200 flex-shrink-0">
+                <div class="flex justify-between items-center">
                     <h3 class="text-lg font-medium text-gray-900">Информация о синхронизации</h3>
                     <button onclick="closeSyncModal()" class="text-gray-400 hover:text-gray-500">
                         <svg class="w-6 h-6" fill="none" stroke="currentColor" viewBox="0 0 24 24">
@@ -56,8 +56,10 @@
                         </svg>
                     </button>
                 </div>
+            </div>
 
-                <div class="space-y-5">
+            <div class="overflow-y-auto flex-1">
+                <div class="p-6 space-y-5">
                     <!-- Section 1: DB Connection -->
                     <div>
                         <h4 class="font-medium text-gray-900 mb-2">Подключение к БД</h4>
@@ -144,8 +146,10 @@
                         </div>
                     </div>
                 </div>
+            </div>
 
-                <div class="mt-6 flex justify-end">
+            <div class="p-6 border-t border-gray-200 flex-shrink-0">
+                <div class="flex justify-end">
                     <button onclick="closeSyncModal()" class="px-4 py-2 bg-gray-600 text-white rounded-md hover:bg-gray-700">
                         Закрыть
                     </button>