feat(theme-studio): bespoke nerd-icons filetype-legend preview (phase 2)

Register nerd-icons as a bespoke app whenever its captured legend is valid: the 34 color faces stay editable rows, and the legend rides APPS['nerd-icons'].legend. A new renderNerdIconsPreview draws each curated filetype's glyph in its mapped face's effective color, read through the same registry the other previews use, so recoloring a face repaints every row mapped to it. When the legend is absent the generic inventory app stands in. The #nerdiconstest browser gate covers the wiring, the dir-row owner, and the recolor-repaint.

Claude-Session: https://claude.ai/code/session_01BqrdWUo9GcznYX2pZr76gZ

1 files changed, 15 insertions, 0 deletions

diff --git a/scripts/theme-studio/test_generate.py b/scripts/theme-studio/test_generate.py
index 7ff207e43..58541cbae 100644
--- a/scripts/theme-studio/test_generate.py
+++ b/scripts/theme-studio/test_generate.py
@@ -641,6 +641,21 @@ class NerdIconsLegend(unittest.TestCase):
             self.assertIsNone(generate.load_nerd_icons_legend(path))
         self.assertIn("invalid", out.getvalue())
 
+    def test_nerd_icons_registered_as_bespoke_legend_app(self):
+        app = generate.APPS.get("nerd-icons")
+        self.assertIsNotNone(app, "nerd-icons should be a bespoke app with the legend present")
+        self.assertEqual(app["preview"], "nerdicons")
+        self.assertTrue(app.get("legend"))
+        self.assertGreaterEqual(len(app["faces"]), 30)
+        # The dir-completion face is a different package and keeps its own app.
+        self.assertIn("nerd-icons-completion", generate.APPS)
+
+    def test_nerd_icons_app_faces_are_seeded_with_native_colors(self):
+        # apply_default_face_seeds fills the editable rows from emacs-default-faces.json.
+        rows = {r[0]: r[2] for r in generate.APPS["nerd-icons"]["faces"]}
+        self.assertIn("nerd-icons-blue", rows)
+        self.assertTrue(rows["nerd-icons-blue"], "nerd-icons-blue should carry a native seed")
+
 
 if __name__ == "__main__":
     unittest.main()