feat: restore voice-call plugin parity

extensions/voice-call/src/utils.ts

@@ -0,0 +1,12 @@
+import os from "node:os";
+import path from "node:path";
+
+export function resolveUserPath(input: string): string {
+  const trimmed = input.trim();
+  if (!trimmed) return trimmed;
+  if (trimmed.startsWith("~")) {
+    const expanded = trimmed.replace(/^~(?=$|[\\/])/, os.homedir());
+    return path.resolve(expanded);
+  }
+  return path.resolve(trimmed);
+}