[Bug Report][3.7.6] Missing typing for slot variables

[crystalfp]

Environment

Vuetify Version: 3.7.6
Vue Version: 3.5.13
Browsers: Chrome 131.0.0.0
OS: Windows 10

Steps to reproduce

Load it and see typescript complains about step (Operator '>' cannot be applied to types 'unknown' and 'number'.); next (Property 'next' does not exist on type 'StepperItemSlot'.) and prev (Property 'prev' does not exist on type 'StepperItemSlot'.).

Expected Behavior

No error from typescript.

Actual Behavior

See above for the typescript errors.

Reproduction Link

https://play.vuetifyjs.com/#...

Other comments

For prev and next there are also other issues open (#18131, #20213), but this adds step error.