Allow us to change the display name of a tracker/project without changing the tracked domain.

This is crucial for multilingual markets (e.g., Belgium NL/FR/DE) where we run multiple trackers on the same domain and need clear names per language/market.

Why: Improves clarity and reporting; several competitors allow renaming projects (SE Ranking, TrueRanker, Senuto, SEO PowerSuite). Keeping the URL fixed while editing the display name is enough.