fix: display midnight hour as "00" instead of "0" in time grid

v1.75.4

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

package.json

@@ -1,6 +1,6 @@
 {
   "name": "my-weekly-todo-list",
-  "version": "1.75.3",
+  "version": "1.75.4",
   "description": "A web-based weekly task management application that organizes to-dos and calendar events in a single, intuitive weekly view",
   "main": "index.js",
   "scripts": {

src/components/WeeklyView.tsx

@@ -1440,7 +1440,7 @@ function formatHour(hour: number, minutes: number = 0, format: "short" | "full"
     }
     // 24h format
     if (format === "short" && minutes === 0) {
-        return `${hour}`;
+        return hour === 0 ? "00" : `${hour}`;
     }
     return `${hour.toString().padStart(2, "0")}:${minutes.toString().padStart(2, "0")}`;
 }