Handle non-suffix decimals in note ID

A reasonable use case is the [Johnny.Decimal](https://johnnydecimal.com/) system. In this case, one might have a folder with Zettelkasten notes in: `/30 Zettelkasten/31 Atomic/31.01 - 1747366626-my-insight` but the previous implementation would, when creating a new note, make the path `/30 Zettelkasten/31 Atomic/31.md` because it considered everything after the "31" to be the suffix. This PR fixes this.