Add tournament update functionality and enhance UI for tournament management

This commit introduces the ability to update tournament details, including name and date, in the backend and frontend. The new `updateTournament` method is added to the `tournamentController` and `tournamentService`, allowing for validation and error handling. The frontend `TournamentsView` is updated to include input fields for editing tournament details, with real-time updates reflected in the UI. Additionally, new CSS styles are introduced for improved layout and user interaction, enhancing the overall experience in tournament management.

backend/migrations/add_name_to_tournament.sql

@@ -0,0 +1,29 @@
+-- Migration: Add name column to tournament table
+-- Date: 2025-01-13
+-- For MariaDB/MySQL
+
+-- Add name column if it doesn't exist
+-- Check if column exists and add it if not
+SET @dbname = DATABASE();
+SET @tablename = 'tournament';
+SET @columnname = 'name';
+SET @preparedStatement = (SELECT IF(
+  (
+    SELECT COUNT(*) FROM INFORMATION_SCHEMA.COLUMNS
+    WHERE
+      (TABLE_SCHEMA = @dbname)
+      AND (TABLE_NAME = @tablename)
+      AND (COLUMN_NAME = @columnname)
+  ) > 0,
+  'SELECT 1',
+  CONCAT('ALTER TABLE `', @tablename, '` ADD COLUMN `', @columnname, '` VARCHAR(255) NOT NULL DEFAULT "" AFTER `id`')
+));
+PREPARE alterIfNotExists FROM @preparedStatement;
+EXECUTE alterIfNotExists;
+DEALLOCATE PREPARE alterIfNotExists;
+
+-- Update existing tournaments: set name to formatted date if name is empty
+UPDATE `tournament` 
+SET `name` = DATE_FORMAT(`date`, '%d.%m.%Y')
+WHERE `name` = '' OR `name` IS NULL;
+