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/package-lock.json

@@ -1,12 +1,12 @@
 {
   "name": "calendar-run-frontend",
-  "version": "0.3.1",
+  "version": "0.4.0",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "calendar-run-frontend",
-      "version": "0.3.1",
+      "version": "0.4.0",
       "dependencies": {
         "react": "^18.3.1",
         "react-dom": "^18.3.1",