Add header section to the masonry layout

### Checklist - [x] I have updated to the latest available Home Assistant version. - [x] I have cleared the cache of my browser. - [x] I have tried a different browser to see if it is related to my browser. - [ ] I have tried reproducing the issue in [safe mode](https://www.home-assistant.io/blog/2023/11/01/release-202311/#restarting-into-safe-mode) to rule out problems with unsupported custom resources. ### Describe the issue you are experiencing Is it possible to add the header section to the masonry layout, similar to how it works with the sections layout. You can get some of the same functionality by adding badges to the top of the masonry layout, but you can't do things like change the alignment or have the badges scroll instead of wrap. ### Describe the behavior you expected If the header section was available I could set the badges to scroll like my other layouts and have a uniform header section across all of my dashboards. ### Steps to reproduce the issue 1. Edit a dashboard 1. Click the + to add a view 1. Choose the Masonry layout The top of the new view has a place to add badges, but it's not in a header section where you can change the layout and other settings. ### What version of Home Assistant Core has the issue? 2026.5.4 ### What was the last working version of Home Assistant Core? _No response_ ### In which browser are you experiencing the issue? Edge, Firefox ### Which operating system are you using to run this browser? macOS Tahoe 26.5 ### State of relevant entities ```txt ``` ### Problem-relevant frontend configuration ```yaml ``` ### JavaScript errors shown in your browser console/inspector ```txt ``` ### Additional information _No response_