Improve user dashboard

### Describe the problem

Currently, the user dashboard merely answers "where I am involved" rather than "what should I do". This is a bit described by https://github.com/WeblateOrg/weblate/issues/5532, but I believe we should more focus on all what makes sense on the dashboard.

I originally posted this at https://github.com/WeblateOrg/weblate/issues/20727#issuecomment-5022350769, but I think it should get a separate tracking issue.

I think something like this would work well:

* My work (What should I do?)
* Watched translations (Where am I involved?) [existing]
* Managed projects (Which projects do I manage?) [existing]
* Suggested translations (Where might I want to look?) [existing]

### Solution brainstorm

Add a work-oriented view to the dashboard in coordination with https://github.com/WeblateOrg/weblate/issues/20727

### Describe alternatives you have considered

_No response_

### Screenshots

_No response_

### Additional context

_No response_

The issue does not name files, tests, or entry points. Start by reviewing the existing dashboard and the linked issues 5532 and 20727, then clarify the work-oriented view and its scope. Done means an agreed dashboard design and implementation covering the proposed work, watched translations, managed projects, and suggested translations views.

Written by the indexing model from the issue text.