working email headers display

maildir_gtd/app.py

@@ -56,6 +56,7 @@ class EmailViewerApp(App):
     CSS_PATH = "email_viewer.tcss"
     folder = reactive("INBOX")
     markdown: Reactive[str] = reactive("Loading...")
+    header_expanded = False
 
     def get_system_commands(self, screen: Screen) -> Iterable[SystemCommand]:
         yield from super().get_system_commands(screen)
@@ -75,6 +76,7 @@ class EmailViewerApp(App):
         Binding("e", "archive", "Archive message"),
         Binding("o", "open", "Open message", show=False),
         Binding("q", "quit", "Quit application"),
+        Binding("h", "toggle_header", "Toggle Envelope Header"),
         Binding("t", "create_task", "Create Task")
     ]
 
@@ -162,6 +164,13 @@ class EmailViewerApp(App):
         """Display a status message using the built-in notify function."""
         self.notify(message, title="Status", severity=severity, timeout=1, markup=True)
 
+    def action_toggle_header(self) -> None:
+        """Toggle the visibility of the EnvelopeHeader panel."""
+        header = self.query_one(EnvelopeHeader)
+        header.styles.height = "1" if self.header_expanded else "auto"
+        self.header_expanded = not self.header_expanded
+
+
     def action_next(self) -> None:
         action_next(self)