build: migrate from Create React App to Vite

- Replace CRA with Vite as the build tool
- Rename index.tsx to main.tsx (Vite convention)
- Add vite.config.ts, tsconfig.app.json, tsconfig.node.json
- Move index.html from public/ to project root
- Replace yarn.lock with package-lock.json
- Remove CRA-specific files (reportWebVitals,
  setupTests, react-app-env.d.ts)
- Update package.json, tsconfig.json, .gitignore, and README.md
- Adjust all source files for Vite compatibility

src/xoonips/blocks/RecentContents.module.css

@@ -1,28 +1,28 @@
 .heading {
-    margin: 0 0 3px;
-    font-size: 100%;
-    font-weight: normal;
+  margin: 0 0 3px;
+  font-size: 100%;
+  font-weight: normal;
 }
 
 .item {
-    display: flex;
-    white-space: nowrap;
-    width: 100%;
+  display: flex;
+  white-space: nowrap;
+  width: 100%;
 }
 
 .order {
-    margin-right: 5px;
+  margin-right: 5px;
 }
 
 .title {
-    overflow: hidden;
-    text-overflow: ellipsis;
+  overflow: hidden;
+  text-overflow: ellipsis;
 }
 
 .date {
-    margin-left: 10px;
+  margin-left: 10px;
 }
 
 .star {
-    margin-left: 5px;
+  margin-left: 5px;
 }