MidnightDKP 0.9.215 - True Header Centering / Remove Global Parchment

Base: 0.9.214.

- Removed the global contentArt QuestBG parchment from the main content frame.
- Dashboard now keeps the intended dark background without hidden parchment layer.
- Added a dedicated titleHolder frame centered on the header.
- MIDNIGHT DKP text is centered on titleHolder, independent of texture transparency.
- Blizzard DialogBox header artwork remains centered around the title.
- Portrait and all dashboard logic preserved.
- No changes to DKP, loot, sessions, sync or admin logic.
