Unity Timeline Interaction System Integration (#17)

- Added InteractionTimelineAction component for timeline-driven interactions
- Implemented custom editor for timeline event mapping
- Updated interaction event flow to support timeline actions
- Enhanced character move target configuration
- Improved inspector UI for interactable components
- Added technical documentation for interaction system
- Refactored interaction action base classes for extensibility
- Fixed issues with character binding in timelines

Co-authored-by: Michal Pikulski <michal@foolhardyhorizons.com>
Co-authored-by: Michal Pikulski <michal.a.pikulski@gmail.com>
Reviewed-on: #17

Assets/Editor/TimelineEventMappingDrawer.cs

@@ -0,0 +1,48 @@
+using UnityEngine;
+using UnityEditor;
+using Interactions;
+using System;
+
+[CustomPropertyDrawer(typeof(InteractionTimelineAction.TimelineEventMapping))]
+public class TimelineEventMappingDrawer : PropertyDrawer
+{
+    public override void OnGUI(Rect position, SerializedProperty property, GUIContent label)
+    {
+        // Use default property drawer, but initialize values if needed
+        InitializeDefaultValues(property);
+        EditorGUI.PropertyField(position, property, label, true);
+    }
+
+    public override float GetPropertyHeight(SerializedProperty property, GUIContent label)
+    {
+        return EditorGUI.GetPropertyHeight(property, label, true);
+    }
+
+    // Called when property is created to initialize default values
+    private void InitializeDefaultValues(SerializedProperty property)
+    {
+        // Check if this is a new/empty property that needs initialization
+        SerializedProperty timelinesArray = property.FindPropertyRelative("timelines");
+        if (timelinesArray != null && timelinesArray.arraySize == 0)
+        {
+            // This appears to be a new property, so initialize default values
+            
+            // Initialize timelines array with one empty element
+            timelinesArray.ClearArray();
+            timelinesArray.InsertArrayElementAtIndex(0);
+            timelinesArray.GetArrayElementAtIndex(0).objectReferenceValue = null;
+            
+            // Set default binding values
+            property.FindPropertyRelative("bindPlayerCharacter").boolValue = true;
+            property.FindPropertyRelative("bindPulverCharacter").boolValue = true;
+            property.FindPropertyRelative("playerTrackName").stringValue = "Player";
+            property.FindPropertyRelative("pulverTrackName").stringValue = "Pulver";
+            property.FindPropertyRelative("timeoutSeconds").floatValue = 30f;
+            property.FindPropertyRelative("loopLast").boolValue = false;
+            property.FindPropertyRelative("loopAll").boolValue = false;
+            
+            // Make sure to apply modifications
+            property.serializedObject.ApplyModifiedProperties();
+        }
+    }
+}