Change: Item: Loading indicator buttons in item and variation detail views

Buttons in the detail item and variation views now display an integrated loading indicator during the execution of the respective action, clearly showing that the action is currently being performed.
The affected actions include: saving, reloading, copying and deleting an item or variation, setting a variation as the main variation, as well as toggling inheritance.
The buttons in the detail tabs also now show loading indicators: cross-selling (add item, reverse-link), text translations (copy, delete), images (link, unlink, upload, delete, assign availability, clear cache), shipping profiles (add), bundles/multipacks (add), sales price (update), barcodes (generate), suppliers (add), multilingual properties (delete), stock, serial numbers, category selection, and the "Print labels" dialogue.
Buttons that initiate a batch operation are disabled during execution to prevent duplicate submissions from repeated clicks.
The loading spinners are controlled via the feature flag “progress-indicators” and are subject to a short delay, so they only appear for operations that actually take time (no flickering with fast responses).

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