Fix: hide CypherQueryBox in SQLite mode

- RightPanel: add use_embedded_db parameter, conditionally mount CypherQueryBox
- RightPanel.get_cypher_query_box(): return None if not exists
- RightPanel.has_cypher_query_box(): check if Cypher UI is available
- app.py: pass USE_EMBEDDED_DB to RightPanel
- app.py: action_focus_query shows notification when Cypher unavailable
- Update help text to note F4 is Neo4j-only

graph_memory_tui/widgets/right_panel.py

@@ -1,6 +1,7 @@
 """右侧面板"""
 
-from textual.containers import Container, Vertical
+from textual.containers import Container, ScrollableContainer
+from textual.css.query import NoMatches
 from textual.widgets import Static
 from textual.app import ComposeResult
 from .config_section import ConfigSection
@@ -12,20 +13,20 @@ from ..models.config import AppConfig
 class RightPanel(Container):
     """右侧边栏"""
 
-    def __init__(self, config: AppConfig | None = None, **kwargs):
+    def __init__(self, config: AppConfig | None = None, use_embedded_db: bool = True, **kwargs):
         super().__init__(**kwargs)
         self._is_collapsed = False
         self._config = config or AppConfig()
+        self._use_embedded_db = use_embedded_db
 
     def compose(self) -> ComposeResult:
         """构建右侧面板"""
-        from textual.containers import ScrollableContainer
-        
         yield Static("F2:隐藏侧边栏", classes="sidebar-title")
         with ScrollableContainer():
             yield ConfigSection(self._config)
             yield OperationLog()
-            yield CypherQueryBox()
+            if not self._use_embedded_db:
+                yield CypherQueryBox()
 
     def toggle(self) -> None:
         """切换折叠/展开"""
@@ -49,9 +50,16 @@ class RightPanel(Container):
         """获取操作日志组件"""
         return self.query_one(OperationLog)
 
-    def get_cypher_query_box(self) -> CypherQueryBox:
-        """获取Cypher查询框组件"""
-        return self.query_one(CypherQueryBox)
+    def get_cypher_query_box(self) -> CypherQueryBox | None:
+        """获取Cypher查询框组件（可能不存在）"""
+        try:
+            return self.query_one(CypherQueryBox)
+        except NoMatches:
+            return None
+
+    def has_cypher_query_box(self) -> bool:
+        """检查是否存在Cypher查询框"""
+        return not self._use_embedded_db
 
     def update_title(self) -> None:
         """更新标题"""