Bug: .rect files still don't work for hotspot textures

[lenship2]

Describe the bug

@craftablescience

The documentation on the wiki mentions support for Hammer++/Source 2 .rect files for hotspot textures. There's even an entire section describing the process of creating them, but despite this documentation they still haven't actually been implemented yet

To Reproduce

1. Obtain a material that references a .rect file
2. Apply that material to a brush in hammer
3. Press the Hot button in the texture application window

Issue Map

N/A

Expected Behavior

.rect files should be referenced when using the hotspotting tool

Operating System

No response