[Condense] Add condense button to expanded task view

[canrobins13]

---

Important

Add a reusable condense button to TaskHeader.tsx for collapsing expanded task views.

• UI Enhancement:
  • Adds a condenseButton to TaskHeader.tsx for collapsing expanded task views.
  • Button is conditionally rendered in both collapsed and expanded states.
• Code Refactoring:
  • Extracts condense button creation into a const to avoid duplication.

^{This description was created by for 1b9144a. You can customize this summary. It will automatically update as commits are pushed.}