feat: implement name system for finding UI elements (#39/40/41)

- Add 'name' property to UIDrawable base class
- All UI elements (Frame, Caption, Sprite, Grid, Entity) support .name
- Entity delegates name to its sprite member
- Add find(name, scene=None) function for exact match search
- Add findAll(pattern, scene=None) with wildcard support (* matches any sequence)
- Both functions search recursively through Frame children and Grid entities
- Comprehensive test coverage for all functionality

This provides a simple way to find UI elements by name in Python scripts,
supporting both exact matches and wildcard patterns.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

src/UIEntityPyMethods.h

@@ -45,4 +45,31 @@ static int UIEntity_set_opacity(PyUIEntityObject* self, PyObject* value, void* c
     
     self->data->sprite.opacity = opacity;
     return 0;
+}
+
+// Name property - delegate to sprite
+static PyObject* UIEntity_get_name(PyUIEntityObject* self, void* closure)
+{
+    return PyUnicode_FromString(self->data->sprite.name.c_str());
+}
+
+static int UIEntity_set_name(PyUIEntityObject* self, PyObject* value, void* closure)
+{
+    if (value == NULL || value == Py_None) {
+        self->data->sprite.name = "";
+        return 0;
+    }
+    
+    if (!PyUnicode_Check(value)) {
+        PyErr_SetString(PyExc_TypeError, "name must be a string");
+        return -1;
+    }
+    
+    const char* name_str = PyUnicode_AsUTF8(value);
+    if (!name_str) {
+        return -1;
+    }
+    
+    self->data->sprite.name = name_str;
+    return 0;
 }