Update the normalizeBranchName function to match rust

Before, uppercase letters and hashes were missing from the regex. I've now coppied the regex from the rust code so they are now identical

app/src/lib/utils/branch.ts

@@ -1,3 +1,3 @@
 export function normalizeBranchName(value: string) {
-	return value.replace(/[^0-9a-z/_.]+/g, '-');
+	return value.replace(/[^A-Za-z0-9_/.#]+/g, '-');
 }