Role for Main Activity

**User input 1 (by ES- Sharepoint ID28)**
For Main Activity - would like possibility to include role and time there also, as for Sub-activity.

**User input 2 (by MU - Sharepoint ID74):**
What about having the opportunity to add responsible unit on the main activities (blue cards) too? To me this is sometimes very useful information. Now I add it in the end of the title, but it's not as elegant :-)

**User input 3 (by MH- sharepoint ID167):**
enable role and time input on main activity, not only sub activity

No files, tests, or entry points are named. Start by tracing how role and time are entered for sub-activities, then compare that flow with the main activity card. Done means main activities support the requested role and time details, with the responsible unit requirement clarified and covered by appropriate tests.

Written by the indexing model from the issue text.