Implement and archive Phase 5 help system

crates/tb-ide/src/designer.rs

@@ -1104,6 +1104,16 @@ impl App {
         }
         Ok(true)
     }
+    pub(crate) fn design_help_context(&mut self) -> Result<(String, String)> {
+        let node = self.selected_node()?;
+        let specs = forms::properties(node.class);
+        let property = if self.properties || self.value_focus {
+            specs.get(self.designer.property).map_or("", |p| p.name)
+        } else {
+            ""
+        };
+        Ok((node.class.name().to_owned(), property.into()))
+    }
     pub(crate) fn design_value_focus(&mut self) -> Result<()> {
         let node = self.selected_node()?;
         let specs = forms::properties(node.class);