chore: remove UserStatus.UNKNOWN

[cbachhuber]

As agreed in #151. Audience view:

[cbachhuber]

Without this, the radio buttons look weirdly compact next to the bar chart. And I don't want to reduce the bar chart's height.

[sourcery-ai]

Hey - I've left some high level feedback:

• In show_user_status_selection, consider making the index = status_options.index(current_user_status) more defensive (e.g., defaulting to 0 if the status isn’t in the list) to avoid runtime errors if new statuses are introduced or if state becomes inconsistent.
• The global CSS rule targeting div[data-testid="stRadio"] label will affect all radio components in the app; if the padding change is only intended for the user status control, consider scoping the selector more narrowly (e.g., wrapping that specific radio in a container with a dedicated class).

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- In `show_user_status_selection`, consider making the `index = status_options.index(current_user_status)` more defensive (e.g., defaulting to 0 if the status isn’t in the list) to avoid runtime errors if new statuses are introduced or if state becomes inconsistent.
- The global CSS rule targeting `div[data-testid="stRadio"] label` will affect all radio components in the app; if the padding change is only intended for the user status control, consider scoping the selector more narrowly (e.g., wrapping that specific radio in a container with a dedicated class).

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (eaf71db) to head (f0bcc73).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #160   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           10        10           
  Lines          503       498    -5     
=========================================
- Hits           503       498    -5     

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