Application toolbar enablement does not udapte

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bughelp wantedtoolbarui/ux

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The application's toolbar enablement state is not updated. The app shows disabled, but it's clickable and executes.

Navigate to https://theia-cloud.io/
Verify Split Editor Right toolbar item is disabled
Open a file in a text editor
Verify Split Editor Right toolbar item is incorrectly disabled; it's expected to be enabled
Click on the toolbar item, the command executes, and the editor splits to the right

When I update the toolbar by adding an item to the left, the Split Editor Right toolbar item correctly updates.

The same problem applies to the navigation toolbar items. Theia shows them disabled, but they execute.

Research direction: Investigate how toolbar items compute their enabled state. Check the `updateToolbarEnablement` method and related context key subscriptions. The issue may be that the enablement update is not triggered after certain actions (e.g., opening a file). Consider adding a watch on editor activation or document change events to force a toolbar update.
Tech stack: typescript
Domain: desktopcloud
Issue type: Bug
Difficulty: 3
Estimated time: Half day
Activity status: Active
Clarity: Clear
Prerequisites: GitTypeScript
Newbie friendliness: 50