[BUG] 404 errors for UI assets on hover when using WFRP4e theme on The Forge

[Deathkael83]

Description
When using the default WFRP4e theme, hovering over sidebar and footer buttons triggers multiple 404 errors in the browser console.

The errors reference missing UI assets, for example:

GET https://assets.forge-vtt.com/systems/wfrp4e/ui/sidebar_button-background_...
404 (Not Found)

GET https://assets.forge-vtt.com/systems/wfrp4e/ui/footer-button.webp
404 (Not Found)

These requests appear to originate from wfrp4e.css and calendar.css (background-image rules on hover).

Steps to Reproduce

1. Enable WFRP4e system with default theme.
2. Host the world on The Forge.
3. Open the browser console.
4. Hover over sidebar or footer buttons.
5. Observe 404 errors for UI image assets.

Expected behavior
No 404 errors should be generated when hovering UI elements.

Screenshots

Foundry Information

• Foundry Version: [e.g. 13]
• WFRP4e System version: [9.3.2 ]
• Simple Calendar Version: [eg 2.5.3]
• Simple Calendar Configuration: [wfrp4e theme]

Browser (please complete the following information):

• Browser: chrome

Notes
It seems the CSS references absolute paths pointing to assets.forge-vtt.com. Possibly using relative paths (e.g. systems/wfrp4e/...) would avoid issues depending on hosting environment.

Let me know if further logs are needed.