Add legacy survey link functionality and UI enhancements

src/callbacks.py

@@ -418,6 +418,19 @@ def register_callbacks(app, search_service: SearchService):
 
         return False, "", "", "", None, ""
 
+    @app.callback(
+        Output("legacy-survey-link", "href"),
+        [Input("current-galaxy-data", "data")],
+        prevent_initial_call=True
+    )
+    def update_legacy_survey_link(galaxy_data):
+        """Update Legacy Survey link with galaxy coordinates."""
+        if galaxy_data and "ra" in galaxy_data and "dec" in galaxy_data:
+            ra = galaxy_data["ra"]
+            dec = galaxy_data["dec"]
+            return f"https://www.legacysurvey.org/viewer?ra={ra}&dec={dec}&layer=ls-dr10&zoom=16"
+        return "#"
+
     @app.callback(
         [Output("galaxy-modal", "is_open", allow_duplicate=True),
          Output("modal-title", "children", allow_duplicate=True),

src/components.py

@@ -176,10 +176,15 @@ def get_app_theme() -> str:
 
             .btn-primary:hover {
                 background: rgba(255, 255, 255, 0.95);
+                color: #000;
                 transform: translateY(-1px);
                 box-shadow: 0 8px 24px rgba(255, 255, 255, 0.15);
             }
 
+            .btn-primary:hover i {
+                color: #000 !important;
+            }
+
             .results-header {
                 color: rgba(245, 245, 247, 0.6);
                 font-weight: 300;
@@ -840,6 +845,17 @@ def create_galaxy_modal():
                 color="primary",
                 className="me-2"
             ),
+            html.A(
+                dbc.Button(
+                    [html.I(className="fas fa-telescope me-2"), "View in Legacy Survey"],
+                    color="primary",
+                    className="me-2"
+                ),
+                id="legacy-survey-link",
+                href="#",
+                target="_blank",
+                rel="noopener noreferrer"
+            ),
             dbc.Button(
                 [html.I(className="fas fa-link me-2"), "Copy link"],
                 id="copy-galaxy-link",
@@ -861,7 +877,9 @@ def create_info_modal():
             html.P("This app searches ~19 million Legacy Survey galaxies with r-mag brighter than 20 magnitude. "
                    "These galaxy images were converted to a text-searchable space using AION-Search, which was trained on "
                    "~275k text descriptions of galaxy images generated by GPT-4.1-mini.",
-                   style={"color": "rgba(245, 245, 247, 0.8)", "margin-bottom": "1rem", "font-size": "0.9rem"})
+                   style={"color": "rgba(245, 245, 247, 0.8)", "margin-bottom": "1rem", "font-size": "0.9rem"}),
+            html.P("Images are from DESI Legacy Surveys DR10 via the hips2fits service provided by the Strasbourg Astronomical Data Centre (CDS).",
+                   style={"color": "rgba(245, 245, 247, 0.6)", "margin-bottom": "0", "font-size": "0.75rem"})
         ]),
         dbc.ModalFooter(
             dbc.Button("Close", id="close-info-modal", className="ms-auto")