Add auto font scaling to REPOLabel

[Jettcodey]

Hey! I've made small additions to add auto font scaling to REPOLabel so text stays within bounds and no longer runs "off-screen" in REPOConfig, maybe i should've made a pr with these changes to that Repository instead, i hope its okay i did it here.
(this annoyed me alot).

Changes:

• Added minFontSize, maxFontSize, and an autoScaleToFit toggle
• Implemented ScaleFontToFit() to adjust font size based on available width
• Added a SetText() helper with optional scaling

Let me know if there are any issues with this i missed, but it worked as i intended it to (see example images).

I know enableAutoSizing exists, but its scaling tends to be too aggressive (imo), which is why I went with this approach instead.

Before:

After: