Make infeasible arm red hover outlines 40% opaque (#5057)

Summary:
Pull Request resolved: #5057

Saw the bright red, found it a bit jarring:
 {F1986915507}

Updating to (from N9873964):
{F1986917158}

 ---
Claude stuff

[ax] Make infeasible arm red hover outlines 60% opaque

The red outlines added by D94783502 for infeasible arms in ScatterPlot and
ArmEffectsPlot are fully opaque. This makes them 60% opaque by changing the
INFEASIBLE_OUTLINE_COLOR from 'red' to 'rgba(255, 0, 0, 0.6)', resulting
in a softer visual indicator that is less visually jarring while still
clearly marking constraint violations.

Changes:
- plotly/utils.py: Change INFEASIBLE_OUTLINE_COLOR from 'red' to 'rgba(255, 0, 0, 0.6)'
- Tests: Update test assertions to match new rgba color value

Reviewed By: SebastianAment

Differential Revision: D96936657

fbshipit-source-id: efc2cf593d40e7dc92e6f0ecfab4b4b2c32942dc

Author: Lena Kashtelyan

ax/analysis/plotly/tests/test_arm_effects.py

@@ -359,7 +359,7 @@ def test_infeasible_arms_have_red_outline(self) -> None:
         # Single trace containing all infeasible arms
         self.assertEqual(len(infeasible_traces), 1)
         trace = infeasible_traces[0]
-        self.assertEqual(trace["marker"]["line"]["color"], "red")
+        self.assertEqual(trace["marker"]["line"]["color"], "rgba(255, 0, 0, 0.6)")
         self.assertGreater(trace["marker"]["line"]["width"], 0)
         # The trace should contain 2 infeasible points
         self.assertEqual(len([x for x in trace["x"] if x is not None]), 2)

ax/analysis/plotly/tests/test_scatter.py

@@ -422,7 +422,7 @@ def test_infeasible_arms_have_red_outline(self) -> None:
         # Single trace containing all infeasible arms
         self.assertEqual(len(infeasible_traces), 1)
         trace = infeasible_traces[0]
-        self.assertEqual(trace["marker"]["line"]["color"], "red")
+        self.assertEqual(trace["marker"]["line"]["color"], "rgba(255, 0, 0, 0.6)")
         self.assertGreater(trace["marker"]["line"]["width"], 0)
         # The trace should contain 2 infeasible points
         self.assertEqual(len([x for x in trace["x"] if x is not None]), 2)

ax/analysis/plotly/utils.py

@@ -73,7 +73,7 @@
 SINGLE_CANDIDATE_TRIAL_LEGEND: str = "Candidate Trial"
 MULTIPLE_CANDIDATE_TRIALS_LEGEND: str = "Candidate Trials"
 
-INFEASIBLE_OUTLINE_COLOR: str = "red"
+INFEASIBLE_OUTLINE_COLOR: str = "rgba(255, 0, 0, 0.6)"
 INFEASIBLE_OUTLINE_WIDTH: float = 2.0
 INFEASIBLE_LEGEND_NAME: str = "Likely Infeasible"