Replace the framerate slider with a numeric input for custom FPS caps

[Riqqqque]

Request

Would you consider replacing Sodium's framerate limit slider with a numeric text box and allowing arbitrary positive FPS caps?

Why this would help

• The current 10-step slider is awkward when someone wants an exact cap like 144, 165, 180, 240, 360, or 480.
• The old 260 ceiling means anything above that effectively becomes uncapped instead of staying at a real user-defined limit.
• A typed value makes more sense here than a slider because this is usually an exact-match setting, not something people tune by feel.

Expected behavior

• The framerate option accepts any positive integer cap.
• Values above the current 260 limit are treated as real caps instead of "max" or uncapped.
• The chosen value saves through the normal options flow and stays in sync anywhere the vanilla framerate option is changed.

Extra context

I ended up building a small addon for this behavior on my own setup, and after actually using it for a while it feels much better than the slider in practice.

I also noticed draft PR #2618 touches the same area, so this might overlap with work you've already seen.

[douira]

If you've already implemented this suggestion, feel free to open a PR to contribute it.