The Add Component Menu's back arrow accumulates phantom levels when the Menu is repeatedly opened into a Category and closed without selecting

Steps to reproduce:

1. Select a Game Object in a Scene
2. Click "Add Component" Button
3. Click a category to enter it (e.g. "Physics")
4. Click elsewhere in the Inspector to close the menu without selecting anything
5. Click "Add Component" again to reopen the menu
6. Observe the header: a back "<" arrow is now present at the top level
7. Repeat steps 3-5 several times

Actual results: A back "<" arrow appears at the top level of the menu where there is
no parent to return to. Clicking it just re-shows the same list. Each open/close cycle
adds another phantom level, so the "<" can be clicked more and more times (each landing on a ghost copy of the list). After ~7 cycles it reproduces permanently every time the menu is opened.

Expected results: Opening the Add Component menu starts at the top level with no back "<" arrow. Reopening the menu does not accumulate phantom navigation levels.

Reproducible with versions: 6000.0.77f1, 6000.3.16f1, 6000.4.12f1, 6000.5.0f1, 6000.6.0a7

Tested on (OS): Windows 11

Notes:

• The menu must be closed by clicking away (without selecting), then reopened, for the
  state to accumulate.