feat(examples): polish workout phone UI

Give the workout exemplar a durable gym-floor command-slate direction, serve focused CSS, keep the first viewport centered on one action, and extend the HTTP E2E to verify stylesheet delivery.

req: examples/001

req: local/001

req: local/003

req: host/002

examples/workout/tests/e2e.rs

@@ -54,10 +54,19 @@ fn workout_is_e2e_working_over_http() {
     assert!(home.text().contains("Now-first Workout Copilot"));
     assert!(home.text().contains("Private event log"));
     assert!(home.text().contains("Replay export"));
+    assert!(home
+        .text()
+        .contains("<link rel=\"stylesheet\" href=\"/workout.css\""));
     assert!(home
         .text()
         .contains(&format!("<script src=\"{}\" defer", runtime_js_path())));
 
+    let css = get(&server, "/workout.css");
+    assert_eq!(css.status, 200);
+    assert!(css.header("content-type").contains("text/css"));
+    assert!(css.text().contains(".command-slate"));
+    assert!(css.text().contains("min-height: var(--tap)"));
+
     let runtime = get(&server, runtime_js_path());
     assert_eq!(runtime.status, 200);
     assert!(runtime.header("content-type").contains("javascript"));
@@ -76,7 +85,7 @@ fn workout_is_e2e_working_over_http() {
     let replayed = post(
         &server,
         "/",
-        &handle_body_from_html(&home.text(), "Replay exported log"),
+        &handle_body_from_html(&home.text(), "Replay export"),
     );
     assert_effect_response(&replayed);
     let replayed_batch = replayed.effects();