FancyStatusBars: Bug fixes, UX improvements, and hotbar-relative default layout

Hey everyone! This PR bundles a bunch of improvements I made to the FancyStatusBars feature that I've been working through over the past while. There's bug fixes, quality-of-life tweaks, and a new system that makes the default bar layout work correctly at any GUI scale.

Bug fixes

• Fixed when you click a bar it just vanishs
• Fixed when you hide a bar you cant show it again

UX / editor improvements

• Added a nudge overlay timer: the X/Y position overlay now displays not just during sub-element dragging, but also for 80 frames after using Shift+Arrow keys to nudge an element. This gives you visual feedback that the nudge registered without the overlay staying on screen permanently.

Hotbar-relative default layout (new)

The biggest addition here is a new HOTBAR_RELATIVE anchor mode for bars. Previously, the default layout was stored as screen-fraction positions (x, y as 0-1 values). This meant the bars would drift to different positions depending on your GUI scale — what looked perfect at scale 2 would be completely off at scale 1 or 3.

Now, default bars store their position as GUI-pixel offsets from the hotbar's top-center instead. Since the Minecraft hotbar is always 182x22 GUI pixels regardless of scale, this makes the default layout completely scale-independent.

How it works:

• Each default bar has hotbarRelOffX, hotbarRelOffY, and hotbarPixelWidth fields
• updatePositions() computes the actual screen pixel position each frame from these offsets and the current screen size
• The moment you drag a bar in the config screen it detaches from the hotbar anchor and becomes a free-floating bar (same behaviour as before), so you still have full control
• "Reset to defaults" puts bars back into hotbar-relative mode

Default layout: three stat bars (Health / Intelligence / Defense) tiled across the hotbar width with 1px gaps, XP bar spanning the full hotbar width 1px above the hotbar, and Speed / Air bars flanking just outside the hotbar's left and right edges below it.

For anyone who wants a walkthrough of the config screen and how to customize your bars, here's a video tutorial:
https://youtu.be/DED4CUVz_Og?si=5CoVrLA3MHZgTL4P

Let me know if anything looks off or needs adjusting. Happy to revise!