Fix MiniMessage and color formatting in disposal GUI title (#6616)

### Information

This PR fixes #6606.

### Details

**Proposed fix:**  
Passes the localized `disposal` string through
`AdventureFacet#miniToLegacy` before creating the chest inventory view
in both `Commanddisposal.java` and `SignDisposal.java`. This ensures
both legacy formatting codes (`&a&l`) and Adventure/MiniMessage tags
(`<green><bold>`) parse and render correctly in the inventory title bar.

**Environments tested:**  

OS: Windows 11  
Java version: Java 21  

- [x] Most recent Paper version (26.2)
- [ ] CraftBukkit/Spigot/Paper 1.12.2
- [ ] CraftBukkit 1.8.8

**Demonstration:**  
<img width="554" height="76" alt="image"
src="https://github.com/user-attachments/assets/6bb5b6a2-2a7b-4cf8-8d54-15776e63e2dd"
/>

<img width="388" height="223" alt="image"
src="https://github.com/user-attachments/assets/bc8f5dee-9faa-4a03-937e-37d64a283e4c"
/>

Author: KeaneAudric777

Essentials/src/main/java/com/earth2me/essentials/commands/Commanddisposal.java

@@ -12,7 +12,8 @@ public Commanddisposal() {
     @Override
     protected void run(final Server server, final User user, final String commandLabel, final String[] args) throws Exception {
         user.sendTl("openingDisposal");
-        user.getBase().openInventory(ess.getServer().createInventory(user.getBase(), 36, user.playerTl("disposal")));
+        final String title = ess.getAdventureFacet().miniToLegacy(user.playerTl("disposal"));
+        user.getBase().openInventory(ess.getServer().createInventory(user.getBase(), 36, title));
     }
 
 }

Essentials/src/main/java/com/earth2me/essentials/signs/SignDisposal.java

@@ -21,10 +21,8 @@ protected boolean onSignCreate(final ISign sign, final User player, final String
 
     @Override
     protected boolean onSignInteract(final ISign sign, final User player, final String username, final IEssentials ess) {
-        String title = (sign.getLine(1) + " " + sign.getLine(2) + " " + sign.getLine(3)).trim();
-        if (title.isEmpty()) {
-            title = player.playerTl("disposal");
-        }
+        final String customTitle = (sign.getLine(1) + " " + sign.getLine(2) + " " + sign.getLine(3)).trim();
+        final String title = customTitle.isEmpty() ? ess.getAdventureFacet().miniToLegacy(player.playerTl("disposal")) : customTitle;
         player.getBase().openInventory(ess.getServer().createInventory(player.getBase(), 36, title));
         return true;
     }