feat: add deals, tasks, and organizations pages with CRUD functionality

- Implemented DealsPage with deal creation, updating, and filtering features.
- Added OrganizationsPage to manage and switch between organizations.
- Created TasksPage for task management, including task creation and filtering.
- Updated router to include new pages for navigation.

frontend/src/hooks/use-debounce.ts

@@ -0,0 +1,12 @@
+import { useEffect, useState } from 'react'
+
+export const useDebounce = <T>(value: T, delay = 300) => {
+  const [debounced, setDebounced] = useState(value)
+
+  useEffect(() => {
+    const timer = window.setTimeout(() => setDebounced(value), delay)
+    return () => window.clearTimeout(timer)
+  }, [value, delay])
+
+  return debounced
+}