Refactor task management and add attachment functionality

- Updated task editing template to handle default status for new tasks and corrected variable names.
- Enhanced work time reporting by rounding time to the nearest quarter hour and adjusting amount formatting.
- Introduced TasksController to manage task-related operations, including status resolution and email notifications.
- Added TaskAttachmentRepository for handling task attachments, including upload, rename, and delete functionalities.
- Implemented WorkTimeRepository to fetch clients with unsettled tasks and calculate total work time.
- Created unit tests for TasksController and TaskAttachmentRepository to ensure functionality and correctness.

tests/Domain/Tasks/TaskAttachmentRepositoryTest.php

@@ -0,0 +1,28 @@
+<?php
+
+require_once __DIR__ . '/../../../autoload/Domain/Tasks/TaskAttachmentRepository.php';
+
+use Domain\Tasks\TaskAttachmentRepository;
+
+function run_task_attachment_repository_tests()
+{
+  assert_true(
+    TaskAttachmentRepository::effectiveTitle( '  Raport  ', 'plik.pdf' ) === 'Raport',
+    'Expected effective title to prefer trimmed custom title.'
+  );
+
+  assert_true(
+    TaskAttachmentRepository::effectiveTitle( '', 'plik.pdf' ) === 'plik.pdf',
+    'Expected effective title to fallback to original file name.'
+  );
+
+  $sanitized = TaskAttachmentRepository::sanitizeFileName( 'Załącznik #1 (final).pdf' );
+  assert_true(
+    strpos( $sanitized, '#' ) === false
+      && strpos( $sanitized, '(' ) === false
+      && strpos( $sanitized, ')' ) === false
+      && strpos( $sanitized, ' ' ) === false
+      && substr( $sanitized, -4 ) === '.pdf',
+    'Expected sanitized file name to remove unsupported characters and keep extension.'
+  );
+}