Fix: normalize chokidar paths for hot reload on Windows (#2120)

Hot reload was not updating pages when editing Markdown files inside subfolders on Windows only.
The issue was caused by inconsistent path separators from chokidar.
This patch ensures paths are normalized with toPosixPath before rebuild.

quartz/build.ts

@@ -151,16 +151,19 @@ async function startWatching(
   const changes: ChangeEvent[] = []
   watcher
     .on("add", (fp) => {
+      fp = toPosixPath(fp)
       if (buildData.ignored(fp)) return
       changes.push({ path: fp as FilePath, type: "add" })
       void rebuild(changes, clientRefresh, buildData)
     })
     .on("change", (fp) => {
+      fp = toPosixPath(fp)
       if (buildData.ignored(fp)) return
       changes.push({ path: fp as FilePath, type: "change" })
       void rebuild(changes, clientRefresh, buildData)
     })
     .on("unlink", (fp) => {
+      fp = toPosixPath(fp)
       if (buildData.ignored(fp)) return
       changes.push({ path: fp as FilePath, type: "delete" })
       void rebuild(changes, clientRefresh, buildData)