Follow-ups to #1803, #1805 and #1806

- Block Attribute Manager: the error band's dismiss button is the close
  icon, not a "×" glyph the web build may not have.
- Two signatures wrapped to the 100-column limit.
- MCP tool schema digest updated for the new `block_def_dialog` and
  `attman_dialog` actions.
- Measurement docs: MEASUREGEOM's Quick mode.

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

src/ui/window/attman_dialog.rs

@@ -981,7 +981,7 @@ pub fn view<'a>(
                         15.0
                     ),
                     text(error.clone()).size(11).width(Fill),
-                    button(text("×").size(12))
+                    button(crate::ui::icons::semantic(crate::ui::icons::CLOSE, 12.0))
                         .on_press(msg(AttManMsg::DismissError))
                         .style(button_style(false))
                         .padding([1, 6]),