Material 3 Custom Theme schematic generates palette with wrong colors

### Is this a regression?

- [ ] Yes, this behavior used to work in the previous version

### The previous version in which this bug was not present was

_No response_

### Description

I have an issue with Material 3 Custom Theme schematic.

https://github.com/angular/components/blob/main/src/material/schematics/ng-generate/theme-color/README.md says that

> The generated [color palettes](https://m3.material.io/styles/color/roles) are optimized to have enough contrast to be more accessible

I understand that, but what about situation when i have #319a97 primary color and generated palette looks like this:

Color "40" #006a68 is used as default and it is much darker. Does not fit the design at all and as you can see primary color #319a97 is completely missing from the palette.

It results in manual override of desired colors to fit the design as it is meant to be.

Can you please kindly explain what am i missing or what am i doing wrong? Thank you.

### Expected Behavior

Generated color palette fits exactly colors that i input during the dialog during generation.

### Actual Behavior

Generated color palette color is much darker to keep contrast for accessibility purpose.

### Environment

- Angular: 20.1.0
- CDK/Material: 20.1.5
- Browser(s): any
- Operating System (e.g. Windows, macOS, Ubuntu): any