handle errors better

app.py

@@ -282,6 +282,12 @@ class SessionMoverApp(App):
         color: $text;
     }
 
+    #current-selection.error {
+        background: $error;
+        color: $text;
+        text-style: bold;
+    }
+
     #selection-count {
         height: auto;
         padding: 1;
@@ -385,10 +391,13 @@ class SessionMoverApp(App):
             self.db.connect()
             self.db.load_reference_data()
         except FileNotFoundError as e:
-            self.notify(str(e), severity="error", timeout=10)
-            self.set_timer(1, self.exit)
+            widget = self.query_one("#current-selection", Static)
+            widget.add_class("error")
+            widget.update(f"Error: {e}\n\nPress q to quit.")
+            self._db_error = True
             return
 
+        self._db_error = False
         self._project_ids: List[str] = []
         self.refresh_project_list()
 
@@ -398,15 +407,14 @@ class SessionMoverApp(App):
         self.query_one("#archived-toggle", Button).can_focus = False
 
         # Setup sessions table (but don't load data yet)
-        table = self.query_one("#sessions-table")
+        table = self.query_one("#sessions-table", DataTable)
         table.zebra_stripes = True
         table.cursor_type = "row"
         table.show_cursor = False
         table.add_columns(" ", "ID", "Title", "Project", "Workspace", "Msgs", "Created")
-        
+
         # Don't load sessions until a project is selected
-        status = self.query_one("#current-selection")
-        status.update("Select a project from the left")
+        self.query_one("#current-selection", Static).update("Select a project from the left")
 
     def on_input_changed(self, event: Input.Changed) -> None:
         if event.input.id == "filter-input":
@@ -655,6 +663,11 @@ class SessionMoverApp(App):
         self.refresh_sessions()
         self.notify("Data refreshed", severity="information")
 
+    async def action_quit(self) -> None:
+        """Exit the app, with a non-zero return code if there was a DB error."""
+        return_code = 1 if getattr(self, "_db_error", False) else 0
+        self.exit(return_code)
+
     def on_unmount(self) -> None:
         """Cleanup on exit."""
         self.db.close()