Fix cleanUrl function to properly handle subpath imports with query/hash

- Preserve # prefix and path for subpath imports
- Remove query parameters and hash fragments after the path
- Handle edge cases: #path?query, #path#hash, #path?query#hash

Co-authored-by: Somhairle MacLeòid <penalosa@users.noreply.github.com>

Author: claude[bot]

packages/vite-plugin-cloudflare/src/utils.ts

@@ -45,6 +45,24 @@ export function getOutputDirectory(
 
 const postfixRE = /[?#].*$/;
 export function cleanUrl(url: string): string {
+	if (url.startsWith("#")) {
+		// For subpath imports, find the first query param (?) or hash fragment after the subpath
+		// and remove everything from there
+		const queryIndex = url.indexOf("?");
+		const hashIndex = url.indexOf("#", 1); // Start search from index 1 to skip the leading #
+		
+		if (queryIndex === -1 && hashIndex === -1) {
+			// No query params or hash fragments to remove
+			return url;
+		}
+		
+		// Find the first occurrence of either ? or # (after position 0)
+		const cutIndex = queryIndex !== -1 && (hashIndex === -1 || queryIndex < hashIndex)
+			? queryIndex
+			: hashIndex;
+		
+		return url.substring(0, cutIndex);
+	}
 	return url.replace(postfixRE, "");
 }