TO-DO-MVP : Task states are not preserved.

Action:
1. Disconnect from the network
2. Add some tasks
3. Select some to change status to complete
4. Kill the app
5. Relaunch app

Expected - Tasks with their states are available
Observed - "You have no TO-DOs" as cache was seen as dirty & data is tried to be retrieved from the network.

Start by reproducing the offline sequence: disconnect, add tasks, change some states, kill the app, and relaunch. Inspect the cache-dirty handling and network retrieval path; done means tasks and their completion states remain available after relaunch without a network connection.

Written by the indexing model from the issue text.