Fix save button visibility on add planning screen to respect runtime permissions

[Copilot]

Description

The EditPlanning component requires a CanWrite parameter to conditionally render the save button. CreatePlanningsPage was not passing this parameter, causing the button to never display.

Initial fix hardcoded CanWrite="true", which bypassed permission validation. Users with revoked write permissions during an active session would still see the save button.

Changes:

• Add dynamic permission check using HasPermissionAsync(PortalPermissions.PlanningWrite)
• Pass result to EditPlanning component via CanWrite="@canWrite"
• Aligns with pattern used in PlanningDetailsPage and PlanningListPage

 <EditPlanning planning=@Planning 
               scheduleList=@ScheduleList 
               mode="New"
-              CanWrite="true" />
+              CanWrite="@canWrite" />

 @code {
     protected override PortalPermissions[] RequiredPermissions 
         = { PortalPermissions.PlanningWrite };
+    private bool canWrite;
     
     protected override async Task OnInitializedAsync()
     {
         await base.OnInitializedAsync();
         // ... initialization ...
+        canWrite = await HasPermissionAsync(PortalPermissions.PlanningWrite);
     }
 }

Provides defense-in-depth: RequiredPermissions gates page access, HasPermissionAsync controls UI element visibility at runtime.

What kind of change does this PR introduce?

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Documentation content changes
• Tests
• Other

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.32%. Comparing base (d4fe118) to head (c08eb83).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3317   +/-   ##
=======================================
  Coverage   81.32%   81.32%           
=======================================
  Files         376      376           
  Lines       14396    14397    +1     
  Branches     1230     1230           
=======================================
+ Hits        11708    11709    +1     
  Misses       2308     2308           
  Partials      380      380           

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[Copilot]

Pull request overview

This PR fixes a bug where the save button was not visible on the Create Planning page. The EditPlanning component requires a CanWrite parameter to conditionally render write-related UI elements, but CreatePlanningsPage was not passing this parameter.

Changes:

• Added dynamic permission checking using HasPermissionAsync(PortalPermissions.PlanningWrite) to determine write permission at runtime
• Passed the permission check result to the EditPlanning component via the CanWrite parameter
• Added a test to verify the save button is displayed when users have write permissions

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
src/IoTHub.Portal.Client/Pages/Planning/CreatePlanningsPage.razor	Added canWrite field and dynamic permission check, passed to EditPlanning component
src/IoTHub.Portal.Tests.Unit/Client/Pages/Planning/CreatePlanningsPageTest.cs	Added test to verify save button displays with write permissions