[DocsUI M3] Fix the 3-section layout on compact screen

* Update table header height as per spec.
* Show table header section for medium/compact
  screen size with Name column only.
* Add divider in compact screen size for header and
  breadcrumb, make it as 3-section layout, similar to
  other screen size layouts.
* Adjust the bottom section layout in compact screen to
  prevent breadcrumb section from being shadowed by
  the saver footer in file saver mode.

Check the attached bug for demo.

Bug: 399225360
Test: m DocumentsUIGoogle && manual inspection
Flag: com.android.documentsui.flags.use_material3
Change-Id: I251da779013964b93835f7820dcf0b4d025cab0a