feat: Engine diagnostics (#92)

Adds a `Diagnostics` component that shows the following diagnostics from the last realization:

- Confirmation of success or a short description of what failed.
- The value of the loss function at each step.
- The spectrum of the Hessian at each step.

The loss and spectrum plots are shown on switchable panels.

Also includes some refactoring/renaming of existing code.

Co-authored-by: Aaron Fenyes <aaron.fenyes@fareycircles.ooo>
Reviewed-on: StudioInfinity/dyna3#92
Co-authored-by: Vectornaut <vectornaut@nobody@nowhere.net>
Co-committed-by: Vectornaut <vectornaut@nobody@nowhere.net>

app-proto/src/add_remove.rs

@@ -3,8 +3,9 @@ use sycamore::prelude::*;
 use web_sys::{console, wasm_bindgen::JsValue};
 
 use crate::{
-    engine,
     AppState,
+    engine,
+    engine::DescentHistory,
     assembly::{Assembly, InversiveDistanceRegulator, Point, Sphere}
 };
 
@@ -195,6 +196,7 @@ pub fn AddRemove() -> View {
             assembly.regulators.update(|regs| regs.clear());
             assembly.elements.update(|elts| elts.clear());
             assembly.elements_by_id.update(|elts_by_id| elts_by_id.clear());
+            assembly.descent_history.set(DescentHistory::new());
             state.selection.update(|sel| sel.clear());
             
             // load assembly