Fix plotly orca timeout errors by using kaleido engine

- Add kaleido to environment.yml for reliable image export
- Update all fig.to_image() calls to use engine='kaleido'
- Fixes execution errors in BCG_complete_mkts, BCG_incomplete_mkts, and knowing_forecasts_of_others
- Kaleido is the modern replacement for orca and works reliably in CI environments

Author: mmcky

environment.yml

@@ -15,5 +15,6 @@ dependencies:
     - sphinxcontrib-youtube==1.4.1
     - sphinx-togglebutton==0.3.2
     - sphinx-reredirects==0.1.4
+    - kaleido
 
 

lectures/BCG_complete_mkts.md

@@ -1194,7 +1194,7 @@ fig.update_layout(width=500,
 fig.update_layout(scene_camera=dict(eye=dict(x=2, y=-2, z=1.5)))
 
 # Export to PNG file
-Image(fig.to_image(format="png"))
+Image(fig.to_image(format="png", engine="kaleido"))
 # fig.show() will provide interactive plot when running
 # notebook locally
 ```

lectures/BCG_incomplete_mkts.md

@@ -1270,7 +1270,7 @@ fig.update_layout(scene_camera=dict(eye=dict(x=1.5, y=-1.5, z=2)))
 fig.update_layout(title='Equilibrium firm valuation for the grid of (k,b)')
 
 # Export to PNG file
-Image(fig.to_image(format="png"))
+Image(fig.to_image(format="png", engine="kaleido"))
 # fig.show() will provide interactive plot when running
 # code locally
 ```
@@ -1634,7 +1634,7 @@ fig.update_layout(title='Equilibrium firm valuation for the grid of (k,b)')
 
 
 # Export to PNG file
-Image(fig.to_image(format="png"))
+Image(fig.to_image(format="png", engine="kaleido"))
 # fig.show() will provide interactive plot when running
 # code locally
 ```
@@ -1685,7 +1685,7 @@ fig.update_layout(scene_camera=dict(eye=dict(x=1.5, y=-1.5, z=2)))
 fig.update_layout(title='Equilibrium firm valuation for the grid of (k,b)')
 
 # Export to PNG file
-Image(fig.to_image(format="png"))
+Image(fig.to_image(format="png", engine="kaleido"))
 # fig.show() will provide interactive plot when running
 # code locally
 ```
@@ -1746,7 +1746,7 @@ fig.update_layout(title='Equilibrium equity valuation for the grid of (k,b)')
 
 
 # Export to PNG file
-Image(fig.to_image(format="png"))
+Image(fig.to_image(format="png", engine="kaleido"))
 # fig.show() will provide interactive plot when running
 # code locally
 ```
@@ -1776,7 +1776,7 @@ fig.update_layout(title='Equilibrium bond valuation for the grid of (k,b)')
 
 
 # Export to PNG file
-Image(fig.to_image(format="png"))
+Image(fig.to_image(format="png", engine="kaleido"))
 # fig.show() will provide interactive plot when running
 # code locally
 ```

lectures/knowing_forecasts_of_others.md

@@ -1020,7 +1020,7 @@ fig.update_layout(title=r'Impulse Response Function',
                    yaxis_title=r'$k^{i}_{t}$')
 fig1 = fig
 # Export to PNG file
-Image(fig1.to_image(format="png"))
+Image(fig1.to_image(format="png", engine="kaleido"))
 # fig1.show() will provide interactive plot when running
 # notebook locally
 ```