Add error messages for incompatible sources and add a tag for untagged entries

[subinasr]

• Depends on server-branch

Changes

• Add a tag for untagged entries
• Add proper error messages for incompatible sources

This PR doesn't introduce any:

• [x] temporary files, auto-generated files or secret keys
• [x] build works
• [x] eslint issues
• [x] typescript issues
• [x] codegen errors
• [x] console.log meant for debugging
• [x] typos
• [x] unwanted comments
• [x] conflict markers

[ghost]

👇 Click on the image for a new way to code review

#### [](https://app.codesee.io/r/reviews?pr=2817&src=https%3A%2F%2Fgithub.com%2Fthe-deep%2Fclient) #### Legend