fix: hide progress bar in Code Editor for empty projects

[willeastcott]

Summary

• When a project has no scripts/files/folders, the Code Editor's progress bar in the files panel stays visible indefinitely
• The assets:load:progress event was never emitted in the empty-assets path, so the progress bar's hidden property was never set to rue
• Emit assets:load:progress with a value of 1 (complete) before assets:load so the bar hides itself

Test Plan

• Open the Code Editor for a project with no scripts/files/folders
• Verify the progress bar disappears after loading completes
• Open the Code Editor for a project with scripts and verify normal loading behavior is unaffected

[Copilot]

Pull request overview

Fixes the Code Editor files panel loading progress bar getting stuck for empty projects by ensuring a completion progress event is emitted even when there are zero assets to load.

Changes:

• Emit assets:load:progress with value 1 in the empty-assets path so the files panel progress bar hides correctly.
• Preserve existing assets:load + status:clear behavior for the empty-assets path.

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