Block "Generate URN Mapping" Button During Indexing

[VitaliyBoyko]

Update the existing "Generate URN Mapping" button to remain disabled while the IDE is indexing and automatically re-enable it once indexing is complete.

See com.magento.idea.magento2plugin.project.SettingsForm#createComponent

Requirements

1. Use IntelliJ's indexing state (e.g., DumbService) to detect when indexing is in progress.
2. Dynamically enable/disable the button based on the indexing state.

Acceptance Criteria

• Button is disabled during indexing.
• Button becomes enabled automatically after indexing is complete.
• Uses com.intellij.psi.search.FilenameIndex once indexing is finished.

[m2-assistant]

Hi @VitaliyBoyko. Thank you for your report.
To speed up processing of this issue, make sure that you provided sufficient information.
Add a comment to assign the issue: @magento I am working on this

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