feat: Add wiki integration to task management

- Implemented a multi-select dropdown for associating tasks with wiki entries in the task edit form.
- Enhanced task popup to display related wiki entries with visibility controls based on user permissions.
- Updated the wiki main view to support bulk actions for categories, including deletion and search functionality.
- Created a new database migration for establishing many-to-many relationships between tasks and wiki entries.
- Improved styling for wiki components to enhance user experience.
- Added a new AGENTS.md file to outline communication and change management protocols.

docs/migrations/2026-03-03-task-wiki-relations.sql

@@ -0,0 +1,10 @@
+-- 2026-03-03: relacja wiele-do-wielu zadania <-> wpisy wiki
+
+CREATE TABLE IF NOT EXISTS `task_wiki` (
+  `task_id` INT NOT NULL,
+  `wiki_id` INT NOT NULL,
+  `date_add` DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
+  PRIMARY KEY (`task_id`, `wiki_id`),
+  KEY `idx_task_wiki_wiki` (`wiki_id`)
+);
+