Never crash: UI and app shells (ui-egui, vectorcraft, vectorcraft-web, cli perf)

Removes the remaining production unwraps in the UI (fit view, save, macOS
shortcut labels, layers rows, swatch rows) and the CLI perf budget runner
(errors are reported instead of expect), and adds the deny attribute to
ui-egui, the desktop app and the web app.

vectorcraft-cli's main.rs is left without the attribute because an open
PR (#13) edits that file.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

apps/vectorcraft-cli/src/perf.rs

@@ -43,7 +43,9 @@ pub fn synthetic(n: usize) -> Document {
         if i % 3 == 1 {
             node.opacity = 0.8;
         }
-        d.insert(Some(l), usize::MAX, node).expect("insert");
+        if d.insert(Some(l), usize::MAX, node).is_err() {
+            break;
+        }
     }
     d
 }
@@ -122,8 +124,17 @@ pub fn run(args: &[String]) -> Result<(), String> {
     rows.push(("hit test (per click)", hits, 2.0));
 
     let mut bytes = vec![];
+    let mut failed: Option<String> = None;
     rows.push(("save .vectorcraft", median_ms(3, || bytes = vectorcraft_format::save_file(&doc)), 300.0));
-    rows.push(("open .vectorcraft", median_ms(3, || drop(vectorcraft_format::load(&bytes).expect("load"))), 300.0));
+    rows.push((
+        "open .vectorcraft",
+        median_ms(3, || {
+            if let Err(e) = vectorcraft_format::load(&bytes) {
+                failed = Some(format!("open .vectorcraft: {e}"));
+            }
+        }),
+        300.0,
+    ));
     let svg_opts = vectorcraft_svg::ExportOptions::default();
     rows.push(("export SVG", median_ms(3, || drop(vectorcraft_svg::export(&doc, &svg_opts))), 500.0));
 
@@ -131,10 +142,14 @@ pub fn run(args: &[String]) -> Result<(), String> {
     let unite = median_ms(3, || {
         let mut s = vectorcraft_engine::Session::new();
         s.add_document(synthetic(1000), None);
-        s.execute("select.all", &json!({})).expect("select");
-        s.execute("object.pathfinder.unite", &json!({})).expect("unite");
+        if let Err(e) = s.execute("select.all", &json!({})).and_then(|_| s.execute("object.pathfinder.unite", &json!({}))) {
+            failed = Some(format!("Pathfinder Unite: {e}"));
+        }
     });
     rows.push(("Pathfinder Unite, 1,000 paths", unite, 150.0));
+    if let Some(e) = failed {
+        return Err(e);
+    }
 
     let mut over = 0;
     println!("  {:<40} {:>10} {:>10}", "", "measured", "budget");