Project chronological date: YMD admin, month/year public, sort/recent

- Serialize and save project.date as date-only YYYY-MM-DD (no TZ drift)
- Admin label + hint; projects list shows Date column
- Home Recent and portfolio date sort use project.date (nulls last)
- Public display stays month+year / year-only via safe formatters

client/src/components/ProjectCard.tsx

@@ -1,11 +1,12 @@
 import { Link } from "react-router-dom";
 import type { Project } from "../lib/api";
 import { thumbOf } from "../lib/api";
+import { formatProjectYear } from "../lib/dates";
 import "./ProjectCard.scss";
 
 export function ProjectCard({ project, index = 0 }: { project: Project; index?: number }) {
   const thumb = thumbOf(project);
-  const year = project.date ? new Date(project.date).getFullYear() : null;
+  const year = formatProjectYear(project.date);
 
   return (
     <article