feat(frontend): race form, start time selects, calendar views, day page

- Hide org schedule fields when editing a past race; isRaceDateInPast helper
- StartTimeSelects (HH:mm:ss) and optional ?date= prefill on new race
- Full-card link to edit for races needing result entry; shadow token
- List/calendar toggle (sessionStorage); year grid and month focus views
- Date hover popover and /races/day/:ymd page with Add button
- Docs plan-korrektirovok-starty.md and startTime API note; client 0.4.0

Made-with: Cursor

frontend/src/components/StartTimeSelects.tsx

@@ -0,0 +1,157 @@
+import { useCallback, useMemo } from "react";
+
+function pad2(n: number): string {
+  return String(n).padStart(2, "0");
+}
+
+function parseToParts(value: string): { h: number | null; m: number | null; s: number | null } {
+  const t = value.trim();
+  if (!t) {
+    return { h: null, m: null, s: null };
+  }
+  const parts = t.split(":").map((p) => p.trim());
+  if (parts.length === 2) {
+    const h = Number(parts[0]);
+    const m = Number(parts[1]);
+    if (Number.isInteger(h) && Number.isInteger(m) && h >= 0 && h <= 23 && m >= 0 && m <= 59) {
+      return { h, m, s: 0 };
+    }
+  }
+  if (parts.length >= 3) {
+    const h = Number(parts[0]);
+    const m = Number(parts[1]);
+    const s = Number(parts[2]);
+    if (
+      Number.isInteger(h) &&
+      Number.isInteger(m) &&
+      Number.isInteger(s) &&
+      h >= 0 &&
+      h <= 23 &&
+      m >= 0 &&
+      m <= 59 &&
+      s >= 0 &&
+      s <= 59
+    ) {
+      return { h, m, s };
+    }
+  }
+  return { h: null, m: null, s: null };
+}
+
+function partsToString(h: number | null, m: number | null, s: number | null): string {
+  if (h === null || m === null || s === null) {
+    return "";
+  }
+  return `${pad2(h)}:${pad2(m)}:${pad2(s)}`;
+}
+
+const HOURS = Array.from({ length: 24 }, (_, i) => i);
+const MIN_SEC = Array.from({ length: 60 }, (_, i) => i);
+
+interface StartTimeSelectsProps {
+  value: string;
+  onChange: (next: string) => void;
+  disabled?: boolean;
+}
+
+export function StartTimeSelects(props: StartTimeSelectsProps): JSX.Element {
+  const { value, onChange, disabled } = props;
+  const { h, m, s } = useMemo(() => parseToParts(value), [value]);
+
+  const emit = useCallback(
+    (nextH: number | null, nextM: number | null, nextS: number | null) => {
+      onChange(partsToString(nextH, nextM, nextS));
+    },
+    [onChange],
+  );
+
+  const hourVal = h === null ? "" : String(h);
+  const minVal = m === null ? "" : String(m);
+  const secVal = s === null ? "" : String(s);
+
+  return (
+    <div className="race-form__time-picker">
+      <label className="race-form__time-picker__unit">
+        <span className="race-form__time-picker__label">Часы</span>
+        <select
+          className="race-form__input race-form__time-picker__select"
+          aria-label="Часы"
+          disabled={disabled}
+          value={hourVal}
+          onChange={(e) => {
+            const v = e.target.value;
+            if (v === "") {
+              emit(null, null, null);
+              return;
+            }
+            const nh = Number(v);
+            emit(nh, m ?? 0, s ?? 0);
+          }}
+        >
+          <option value="">—</option>
+          {HOURS.map((n) => (
+            <option key={n} value={String(n)}>
+              {pad2(n)}
+            </option>
+          ))}
+        </select>
+      </label>
+      <span className="race-form__time-picker__sep" aria-hidden>
+        :
+      </span>
+      <label className="race-form__time-picker__unit">
+        <span className="race-form__time-picker__label">Минуты</span>
+        <select
+          className="race-form__input race-form__time-picker__select"
+          aria-label="Минуты"
+          disabled={disabled}
+          value={minVal}
+          onChange={(e) => {
+            const v = e.target.value;
+            if (v === "") {
+              emit(null, null, null);
+              return;
+            }
+            const nm = Number(v);
+            emit(h ?? 0, nm, s ?? 0);
+          }}
+        >
+          <option value="">—</option>
+          {MIN_SEC.map((n) => (
+            <option key={n} value={String(n)}>
+              {pad2(n)}
+            </option>
+          ))}
+        </select>
+      </label>
+      <span className="race-form__time-picker__sep" aria-hidden>
+        :
+      </span>
+      <label className="race-form__time-picker__unit">
+        <span className="race-form__time-picker__label">Секунды</span>
+        <select
+          className="race-form__input race-form__time-picker__select"
+          aria-label="Секунды"
+          disabled={disabled}
+          value={secVal}
+          onChange={(e) => {
+            const v = e.target.value;
+            if (v === "") {
+              emit(null, null, null);
+              return;
+            }
+            const ns = Number(v);
+            emit(h ?? 0, m ?? 0, ns);
+          }}
+        >
+          <option value="">—</option>
+          {MIN_SEC.map((n) => (
+            <option key={n} value={String(n)}>
+              {pad2(n)}
+            </option>
+          ))}
+        </select>
+      </label>
+    </div>
+  );
+}