- Rename app to 'Motief: de stematlas' in Home.py - Remove PCA variance caption from compass tab - Hardcode db_path and window_size; remove sidebar inputs - Change trajectories default to [CDA, D66, VVD] - Move quiz to pages/1_Stemwijzer.py; wrap in st.form - Remove quiz tab from main explorer - Add pytest dev dep + fix test fixtures (_load_mp_vectors_for_window) - Add test_pca_axis_orientation with proper PCA variance dominance