Flow: right-click menus like SaraFem's

Boxes, arrow labels and the background each get a menu (edit, delete,
connect, test a file, copy path/patterns, ...), using SaraFem's single
shared ContextMenu opened from _RequestMenu. Tools can open on the tester
for a given input.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

ToolsPage.py

@@ -65,7 +65,11 @@ class ToolsPage(ft.Column):
             self.Body,
         ]
 
-    def Refresh(self) -> None:
+    def Refresh(self, Section: str = "", TestInput: str = "") -> None:
+        """Section and TestInput open a given tool, e.g. the tester for an input
+        right-clicked in Flow."""
+        if Section in self.Buttons:
+            self.Section = Section
         self.TheSetup, Error = self.App.LoadSetup()
         if self.TheSetup is None:
             self.Body.content = EmptyState("Can't read SaraSortd's config.", Error)
@@ -76,6 +80,8 @@ class ToolsPage(ft.Column):
             Current = Picker.value
             Picker.options = [ft.DropdownOption(key=PathText, text=DisplayPath(PathText)) for PathText in Inputs]
             Picker.value = Current if Current in Inputs else (Inputs[0] if Inputs else None)
+        if TestInput in Inputs:
+            self.TestInput.value = TestInput
         self._Show(self.Section)
 
     def _Show(self, Name: str) -> None: