refactor: revisit note import process

- Should we simplify the import process and move some of the logic to the `SyncState` component? I belive this would reduce the number of edge cases when dealing with note state transitions by centralizing the logic in one place. Context: https://github.com/0xPolygonMiden/miden-client/pull/828#issuecomment-2828769510

- In a similar vein, how should we deal with `Unverified` notes in the import process? Currently, when we import an unverified note we add its tag to the client so that it is verified in the sync process. This simplifies the import process (in line with the first point) but may overload the sync requests a bit which may be a problem for the node. Context: https://github.com/0xPolygonMiden/miden-client/pull/828#issuecomment-2791063565