refactor: simplify Explorer to 3 focused tabs — compass, trajectories, SVD

Removes embedding-heavy search and generic browser tabs from the Explorer.
The project does not currently use embeddings meaningfully, so the similarity
search and browser features were dead weight.

Changes:
- explorer.py: Remove search and browser tabs, keep compass/trajectories/SVD
- explorer.py: Remove fused_embeddings and similarity_cache stats from sidebar
- Home.py: Update Explorer description to match new focused layout
- analysis/tabs/__init__.py: Remove search and browser exports
- tests: Update decomposition and import tests for new tab set

Result: Explorer now has 3 focused analytical tabs instead of 5.

Home.py

@@ -19,8 +19,8 @@ def main() -> None:
     st.markdown(
         "**Motief** brengt de Nederlandse Tweede Kamer in kaart op basis van "
         "echte stemmingen over moties. Gebruik de Stemwijzer om te ontdekken welke "
-        "partij het beste bij jouw standpunten past, of verken de politieke ruimte "
+        "partij het beste bij jouw standpunten past, of verken het politieke landschap "
-        "zelf in de Explorer."
+        "in de Explorer: kompas, trajecten en SVD-analyse."
     )
 
     st.divider()
@@ -39,7 +39,7 @@ def main() -> None:
         st.subheader("🔭 Politiek Explorer")
         st.markdown(
             "Verken het politieke kompas, partijtrajecten door de tijd, "
-            "en zoek vergelijkbare moties op in het archief."
+            "en de onderliggende SVD-componenten die de assen vormen."
         )
         st.page_link("pages/2_Explorer.py", label="Open Explorer", icon="🔭")
 

analysis/tabs/__init__.py

@@ -6,16 +6,12 @@ Each module contains a `build_<tab>_tab()` function that implements one tab.
 
 from analysis.tabs.compass import build_compass_tab
 from analysis.tabs.trajectories import build_trajectories_tab
-from analysis.tabs.search import build_search_tab
-from analysis.tabs.browser import build_browser_tab
 from analysis.tabs.components import build_svd_components_tab
 from analysis.tabs.quiz import build_mp_quiz_tab
 
 __all__ = [
     "build_compass_tab",
     "build_trajectories_tab",
-    "build_search_tab",
-    "build_browser_tab",
     "build_svd_components_tab",
     "build_mp_quiz_tab",
 ]

explorer.py

@@ -1,10 +1,9 @@
 """Parlement Explorer — Streamlit data analysis app.
 
-Four tabs:
+Three tabs:
-  1. Politiek Kompas  — 2D scatter of MPs/parties, window slider
+  1. Politiek Kompas   — 2D scatter of MPs/parties, window slider
   2. Partij Trajectories — party centroid lines over time
-  3. Motie Zoeken      — text search + similarity lookup
+  3. SVD Components    — component themes, scree plot, party positions
-  4. Motie Browser     — sortable table + detail panel
 
 Run with: streamlit run explorer.py
 
@@ -408,49 +407,6 @@ def load_motions_df(db_path: str) -> pd.DataFrame:
     return explorer_data.load_motions_df(db_path)
 
 
-def query_similar(
-    db_path: str,
-    source_motion_id: int,
-    vector_type: str = "fused",
-    top_k: int = 10,
-) -> pd.DataFrame:
-    """Return top-k similar motions from similarity_cache (read-only)."""
-    return explorer_data.query_similar(db_path, source_motion_id, vector_type, top_k)
-
-
-def _window_to_dates(window_id: str) -> tuple[str, str]:
-    """Return (start_date, end_date) ISO strings for a given window_id."""
-    return trajectory.window_to_dates(window_id)
-
-
-def build_compass_tab(*args, **kwargs):
-    """Build the Politiek Kompas tab."""
-    from analysis.tabs.compass import build_compass_tab as _impl
-
-    return _impl(*args, **kwargs)
-
-
-def build_trajectories_tab(*args, **kwargs):
-    """Build the Partij Trajectories tab."""
-    from analysis.tabs.trajectories import build_trajectories_tab as _impl
-
-    return _impl(*args, **kwargs)
-
-
-def build_search_tab(*args, **kwargs):
-    """Build the Motie Zoeken tab."""
-    from analysis.tabs.search import build_search_tab as _impl
-
-    return _impl(*args, **kwargs)
-
-
-def build_browser_tab(*args, **kwargs):
-    """Build the Motie Browser tab."""
-    from analysis.tabs.browser import build_browser_tab as _impl
-
-    return _impl(*args, **kwargs)
-
-
 def build_svd_components_tab(*args, **kwargs):
     """Build the SVD Components tab."""
     from analysis.tabs.components import build_svd_components_tab as _impl
@@ -476,24 +432,16 @@ def run_app() -> None:
     st.sidebar.title("Instellingen")
     db_path = "data/motions.db"
     window_size = "annual"
-    show_rejected = st.sidebar.checkbox("Toon verworpen moties", value=False)
 
     with st.sidebar.expander("ℹ️ Over", expanded=False):
         try:
             if _DUCKDB_AVAILABLE:
                 con = duckdb.connect(database=db_path, read_only=True)
                 n_motions = con.execute("SELECT COUNT(*) FROM motions").fetchone()[0]
-                n_fused = con.execute(
-                    "SELECT COUNT(*) FROM fused_embeddings"
-                ).fetchone()[0]
-                n_sim = con.execute("SELECT COUNT(*) FROM similarity_cache").fetchone()[
-                    0
-                ]
                 con.close()
                 st.markdown(
                     f"**Moties:** {n_motions:,}  \n"
-                    f"**Fused embeddings:** {n_fused:,}  \n"
+                    f"**Vensters:** per jaar + huidig parlement"
-                    f"**Similarity cache:** {n_sim:,}"
                 )
             else:
                 st.warning(
@@ -505,22 +453,16 @@ def run_app() -> None:
     tab_labels = [
         "🧭 Politiek Kompas",
         "📈 Trajectories",
-        "🔍 Motie Zoeken",
-        "📋 Motie Browser",
         "🔬 SVD Components",
     ]
 
     if hasattr(st, "tabs") and callable(getattr(st, "tabs")):
-        tab1, tab2, tab3, tab4, tab5 = st.tabs(tab_labels)
+        tab1, tab2, tab3 = st.tabs(tab_labels)
         with tab1:
             build_compass_tab(db_path, window_size)
         with tab2:
             build_trajectories_tab(db_path, window_size)
         with tab3:
-            build_search_tab(db_path, show_rejected)
-        with tab4:
-            build_browser_tab(db_path, show_rejected)
-        with tab5:
             build_svd_components_tab(db_path)
     else:
         selection = st.radio("Tab", tab_labels)
@@ -528,10 +470,6 @@ def run_app() -> None:
             build_compass_tab(db_path, window_size)
         elif selection == tab_labels[1]:
             build_trajectories_tab(db_path, window_size)
-        elif selection == tab_labels[2]:
-            build_search_tab(db_path, show_rejected)
-        elif selection == tab_labels[3]:
-            build_browser_tab(db_path, show_rejected)
         else:
             build_svd_components_tab(db_path)
 

tests/test_explorer_decomposition.py

@@ -27,8 +27,6 @@ class TestExplorerDecomposition:
         tabs = [
             ("analysis/tabs/compass.py", "build_compass_tab"),
             ("analysis/tabs/trajectories.py", "build_trajectories_tab"),
-            ("analysis/tabs/search.py", "build_search_tab"),
-            ("analysis/tabs/browser.py", "build_browser_tab"),
             ("analysis/tabs/components.py", "build_svd_components_tab"),
             ("analysis/tabs/quiz.py", "build_mp_quiz_tab"),
         ]
@@ -75,8 +73,6 @@ class TestExplorerDecomposition:
         tab_modules = [
             "analysis/tabs/compass.py",
             "analysis/tabs/trajectories.py",
-            "analysis/tabs/search.py",
-            "analysis/tabs/browser.py",
             "analysis/tabs/components.py",
             "analysis/tabs/quiz.py",
             "analysis/tabs/_rendering.py",

tests/test_explorer_import.py

@@ -9,6 +9,5 @@ def test_explorer_importable():
     assert callable(mod.run_app)
     assert hasattr(mod, "load_positions")
     assert hasattr(mod, "load_motions_df")
-    assert hasattr(mod, "query_similar")
+    assert hasattr(mod, "build_svd_components_tab")
-    assert hasattr(mod, "build_compass_tab")
+    assert hasattr(mod, "build_mp_quiz_tab")
-    assert hasattr(mod, "build_search_tab")