feat(frontend): add race details page with completed metrics

Implement race detail routing and UI with client-side pace calculation so completed race metrics are visible from the calendar flow.

Made-with: Cursor

frontend/src/pages/RaceDetailsPage.tsx

@@ -0,0 +1,159 @@
+import { useEffect, useMemo, useState } from "react";
+import { Link, useParams } from "react-router-dom";
+import { ApiError, getRaceById } from "../api";
+import { formatDistance, formatRaceDate, getPaceLabel, getRaceStatusLabel } from "../lib";
+import type { Race } from "../api";
+
+function getErrorMessage(error: unknown): string {
+  if (error instanceof ApiError) {
+    return error.message;
+  }
+  return "Не удалось загрузить карточку старта.";
+}
+
+export function RaceDetailsPage(): JSX.Element {
+  const { raceId } = useParams<{ raceId: string }>();
+  const [race, setRace] = useState<Race | null>(null);
+  const [isLoading, setIsLoading] = useState<boolean>(true);
+  const [errorMessage, setErrorMessage] = useState<string | null>(null);
+
+  useEffect(() => {
+    let isMounted = true;
+
+    async function loadRace(): Promise<void> {
+      if (!raceId) {
+        setErrorMessage("Не найден идентификатор старта.");
+        setIsLoading(false);
+        return;
+      }
+
+      try {
+        const item = await getRaceById(raceId);
+        if (!isMounted) {
+          return;
+        }
+        setRace(item);
+        setErrorMessage(null);
+      } catch (error) {
+        if (!isMounted) {
+          return;
+        }
+        setErrorMessage(getErrorMessage(error));
+      } finally {
+        if (isMounted) {
+          setIsLoading(false);
+        }
+      }
+    }
+
+    void loadRace();
+    return () => {
+      isMounted = false;
+    };
+  }, [raceId]);
+
+  const paceLabel = useMemo(() => {
+    if (!race || race.status !== "completed") {
+      return null;
+    }
+    return getPaceLabel(race.finishTime, race.distanceKm);
+  }, [race]);
+
+  if (isLoading) {
+    return (
+      <section className="page page--race-details" aria-busy="true">
+        <h1 className="page__title">Карточка старта</h1>
+        <p className="page__subtitle">Загружаем данные старта...</p>
+      </section>
+    );
+  }
+
+  if (errorMessage || !race) {
+    return (
+      <section className="page page--race-details" role="alert">
+        <h1 className="page__title">Карточка старта</h1>
+        <p className="page__subtitle page__subtitle--error">{errorMessage ?? "Старт не найден."}</p>
+        <Link className="page-link" to="/races">
+          Вернуться к списку стартов
+        </Link>
+      </section>
+    );
+  }
+
+  const isCompleted = race.status === "completed";
+
+  return (
+    <section className="page page--race-details">
+      <div className="race-details-header">
+        <div className="race-details-header__main">
+          <h1 className="page__title">{race.title}</h1>
+          <p className="page__subtitle">
+            {formatRaceDate(race.date)} · {formatDistance(race.distanceKm)}
+          </p>
+        </div>
+        <span
+          className={
+            isCompleted
+              ? "race-card__status race-card__status--completed"
+              : "race-card__status race-card__status--planned"
+          }
+        >
+          {getRaceStatusLabel(race.status)}
+        </span>
+      </div>
+
+      <div className="race-details-grid">
+        <article className="race-details-card">
+          <h2 className="race-details-card__title">Основная информация</h2>
+          <dl className="race-details-meta">
+            <div className="race-details-meta__item">
+              <dt className="race-details-meta__key">Дата</dt>
+              <dd className="race-details-meta__value">{formatRaceDate(race.date)}</dd>
+            </div>
+            <div className="race-details-meta__item">
+              <dt className="race-details-meta__key">Дистанция</dt>
+              <dd className="race-details-meta__value">{formatDistance(race.distanceKm)}</dd>
+            </div>
+            <div className="race-details-meta__item">
+              <dt className="race-details-meta__key">Статус</dt>
+              <dd className="race-details-meta__value">{getRaceStatusLabel(race.status)}</dd>
+            </div>
+          </dl>
+        </article>
+
+        <article className="race-details-card">
+          <h2 className="race-details-card__title">Completed-метрики</h2>
+          {isCompleted ? (
+            <dl className="race-details-meta">
+              <div className="race-details-meta__item">
+                <dt className="race-details-meta__key">Время</dt>
+                <dd className="race-details-meta__value">{race.finishTime ?? "время не указано"}</dd>
+              </div>
+              <div className="race-details-meta__item">
+                <dt className="race-details-meta__key">Темп</dt>
+                <dd className="race-details-meta__value">{paceLabel ?? "не удалось вычислить"}</dd>
+              </div>
+              <div className="race-details-meta__item">
+                <dt className="race-details-meta__key">Стартовый номер</dt>
+                <dd className="race-details-meta__value">{race.bibNumber ?? "не указан"}</dd>
+              </div>
+            </dl>
+          ) : (
+            <p className="race-details-card__empty">
+              Метрики появятся после завершения старта и ввода результата.
+            </p>
+          )}
+        </article>
+      </div>
+
+      <article className="race-details-card race-details-card--notes">
+        <h2 className="race-details-card__title">Заметки</h2>
+        <p className="race-details-card__notes">{race.notes?.trim() ? race.notes : "Заметок пока нет."}</p>
+      </article>
+
+      <Link className="page-link" to="/races">
+        Назад к календарю стартов
+      </Link>
+    </section>
+  );
+}

frontend/src/pages/RacesPage.tsx

@@ -1,4 +1,5 @@
 import { useEffect, useMemo, useState } from "react";
+import { Link } from "react-router-dom";
 import type { Race } from "../api";
 import { ApiError, getRaces } from "../api";
 import { formatDistance, formatRaceDate, getRaceStatusLabel, splitRacesByDate } from "../lib";
@@ -21,7 +22,11 @@ function RaceList(props: { title: string; races: Race[] }): JSX.Element {
           {races.map((race) => (
             <li key={race.id} className="race-card">
               <div className="race-card__main">
-                <p className="race-card__title">{race.title}</p>
+                <p className="race-card__title">
+                  <Link className="race-card__link" to={`/races/${race.id}`}>
+                    {race.title}
+                  </Link>
+                </p>
                 <p className="race-card__meta">
                   {formatRaceDate(race.date)} · {formatDistance(race.distanceKm)}
                 </p>