Show secondary-language actor name in list when primary is empty

[level09]

Fixes BYNT-1719.

Two parts:

1. gen_full_name joined name parts unconditionally, so a Person created with only Arabic names got name = " " (a truthy single space). That junk value defeated the name or None guard in serialization and also pollutes the search vector. It now joins only non-empty parts.
2. The actors list rendered item.name directly, showing blank for such actors. The name column now falls back to name_ar when the primary name is empty (trimmed, so existing rows with the legacy " " value display correctly without a data migration).

The preview card, relate dialogs, and search results already render both languages, so the list column was the only blank surface. Kept the fallback display-side to avoid feeding name_ar into the editable name field of the edit dialog for entities.

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