fix the figure font when rendered

cli/openbb_cli/outputs/figure.py

@@ -39,6 +39,31 @@ def is_plotly_figure(data: Any) -> bool:
     )
 
 
+def strip_theme_colors(layout: Any) -> Any:
+    """Remove the server-side theme from a figure layout.
+
+    Parameters
+    ----------
+    layout : Any
+        A Plotly layout, or any value nested inside one.
+
+    Returns
+    -------
+    Any
+        A copy without the embedded ``template`` or any ``*color`` setting, so
+        the displaying window's own light and dark templates style the chart.
+    """
+    if isinstance(layout, dict):
+        return {
+            key: strip_theme_colors(value)
+            for key, value in layout.items()
+            if key != "template" and not key.lower().endswith("color")
+        }
+    if isinstance(layout, list):
+        return [strip_theme_colors(value) for value in layout]
+    return layout
+
+
 def _plotlyjs_tag() -> str:
     """Return the script tag that loads plotly.js, inlined when plotly is installed.
 
@@ -94,7 +119,9 @@ def show_figure(figure: dict, title: str = "") -> None:
             from plotly.graph_objects import Figure
 
             backend.send_figure(
-                Figure(data=figure["data"], layout=figure["layout"]),
+                Figure(
+                    data=figure["data"], layout=strip_theme_colors(figure["layout"])
+                ),
                 command_location=title,
             )
             return

cli/tests/test_outputs_figure.py

@@ -7,7 +7,12 @@ from unittest.mock import MagicMock, patch
 import pytest
 
 from openbb_cli.outputs import figure as figure_module
-from openbb_cli.outputs.figure import is_plotly_figure, render_figure_html, show_figure
+from openbb_cli.outputs.figure import (
+    is_plotly_figure,
+    render_figure_html,
+    show_figure,
+    strip_theme_colors,
+)
 
 FIGURE = {
     "data": [{"type": "scatter", "x": [1, 2], "y": [3, 4], "name": "</script>"}],
@@ -92,6 +97,25 @@ class TestShowFigure:
             == "/cboe/options/term_structure"
         )
 
+    def test_backend_figure_drops_server_theme_colors(self, mock_session):
+        themed = {
+            "data": [{"type": "scatter", "y": [1, 2], "line": {"color": "red"}}],
+            "layout": {
+                "template": {"layout": {"font": {"color": "#2a3f5f"}}},
+                "font": {"color": "white", "size": 12},
+                "paper_bgcolor": "rgba(0,0,0,0)",
+                "xaxis": {"linecolor": "white", "title": {"text": "Date"}},
+            },
+        }
+        show_figure(themed, "t")
+        fig = mock_session.backend.send_figure.call_args[0][0]
+        assert fig.layout.font.color is None
+        assert fig.layout.font.size == 12
+        assert fig.layout.paper_bgcolor is None
+        assert fig.layout.xaxis.linecolor is None
+        assert fig.layout.xaxis.title.text == "Date"
+        assert fig.data[0].line.color == "red"
+
     def test_backend_failure_opens_browser(self, mock_session):
         mock_session.backend.send_figure.side_effect = RuntimeError("no window")
         with patch("openbb_cli.outputs.figure.webbrowser.open") as open_browser:
@@ -112,3 +136,26 @@ class TestShowFigure:
             show_figure(FIGURE, "t")
         open_browser.assert_called_once_with((tmp_path / "chart.html").as_uri())
         assert "Plotly.newPlot" in (tmp_path / "chart.html").read_text()
+
+
+class TestStripThemeColors:
+    """Removing server-side theme styling from a layout."""
+
+    def test_removes_template_and_color_keys_recursively(self):
+        layout = {
+            "template": {"layout": {}},
+            "paper_bgcolor": "black",
+            "colorway": ["#111", "#222"],
+            "annotations": [{"text": "a", "font": {"color": "white", "size": 9}}],
+            "legend": {"bgcolor": "black", "orientation": "h"},
+        }
+        assert strip_theme_colors(layout) == {
+            "colorway": ["#111", "#222"],
+            "annotations": [{"text": "a", "font": {"size": 9}}],
+            "legend": {"orientation": "h"},
+        }
+
+    def test_leaves_the_input_unchanged(self):
+        layout = {"font": {"color": "white"}}
+        strip_theme_colors(layout)
+        assert layout == {"font": {"color": "white"}}