chore: 清理敏感信息，完善工程结构和文档

tests/test_handlers/test_focus_handler.py

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+"""焦点处理器测试"""
+
+import pytest
+from graph_memory_tui.handlers.focus_handler import FocusHandler
+
+
+def test_focus_handler_creation():
+    """测试焦点处理器创建"""
+    handler = FocusHandler()
+    assert handler is not None
+    assert handler._current_index == 0
+
+
+def test_focus_ring():
+    """测试焦点循环"""
+    handler = FocusHandler()
+    assert len(handler.FOCUS_RING) == 5
+    assert "input-textarea" in handler.FOCUS_RING
+    assert "cypher-textarea" in handler.FOCUS_RING
+
+
+def test_get_current_focus_name():
+    """测试获取当前焦点名称"""
+    handler = FocusHandler()
+    name = handler.get_current_focus_name()
+    assert name == "Input"
+
+
+def test_focus_names_mapping():
+    """测试焦点名称映射"""
+    handler = FocusHandler()
+    assert handler.FOCUS_NAMES["input-textarea"] == "Input"
+    assert handler.FOCUS_NAMES["cypher-textarea"] == "Query"