fix: do not reload multiple tabs on block save

[asadali145]

Description

This PR fixes the below issues:

• When a block is changed, it reloads whole page to enable the publish button. This PR fixes it to only reload the sidebar to enable the publish button.

BEFORE:

Screen.Recording.2025-11-04.at.12.51.08.PM.mov

AFTER:

Screen.Recording.2025-11-04.at.1.08.12.PM.mov

• If there are multiple tabs open, changing a block was reloading all tabs. This PR fixes it to reload the sidebar of only the current tab.

BEFORE:

Screen.Recording.2025-11-04.at.12.52.09.PM.mov

AFTER:

Screen.Recording.2025-11-04.at.1.08.52.PM.mov

• Video block save does not enable the Publish button when updated; This PR fixes that as well.

BEFORE:

Screen.Recording.2025-11-04.at.12.53.57.PM.mov

AFTER:

Screen.Recording.2025-11-04.at.1.09.31.PM.mov

Testing instructions

• Checkout master branch
• Create a course and edit any problem block in a unit. Notice that the full page will reload and enable the publish button.
• Now open another course in a new tab.
• Open the problem editor and make changes in both tabs, Keep the unsaved changes open in the editor in one of the tabs and save the other one. Notice that both tabs will reload and you lose the changes in the tab with unsaved changes.
• Now edit any video block and notice that the publish button won't be enabled and you have to reload the page to enable the publish button.
• Checkout this branch and test all cases.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.82%. Comparing base (436ac31) to head (d815217).

Additional details and impacted files

@@           Coverage Diff            @@
##           master    #2600    +/-   ##
========================================
  Coverage   94.82%   94.82%            
========================================
  Files        1226     1226            
  Lines       27557    27557            
  Branches     6043     6209   +166     
========================================
  Hits        26131    26131            
+ Misses       1368     1355    -13     
- Partials       58       71    +13     

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