A manicure is read as self-care and attention to how you hold and handle things. Tradition links it to taking time for yourself, and to wanting your work to look polished.
When this appeared in your dream, what were you feeling?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.