feat(defs): add WULA_AreaTeleportBeacon and refactor csproj configuration

- Add WULA_AreaTeleportBeacon definition in WULA_Misc_Buildings.xml
- Update .csproj to use wildcard inclusion for source files
- Remove unused classes (PrefabSpawner, Letter_EventChoice, QuestNode_Root_EventLetter)
- Update assembly binary

Source/WulaFallenEmpire/BuildingComp/WULA_Teleporter/CompProperties_MapTeleporter.cs

@@ -0,0 +1,21 @@
+using RimWorld;
+using Verse;
+
+namespace WulaFallenEmpire
+{
+    public class CompProperties_MapTeleporter : CompProperties
+    {
+        public float radius = 5f;
+        public int warmupTicks = 120;
+        public EffecterDef warmupEffecter;
+        public SoundDef warmupSound;
+        public SoundDef teleportSound;
+        
+        public ResearchProjectDef requiredResearch;
+        
+        public CompProperties_MapTeleporter()
+        {
+            compClass = typeof(CompMapTeleporter);
+        }
+    }
+}