[FEATURE REQUEST] Ability to select and sell multiple inventory items at once

[imadraude]

Current Behavior (if any)

Currently, the extension only allows listing and selling one inventory item at a time, using the price suggestion feature.

Desired Behavior

I would like the extension to support selecting multiple items in the Steam inventory and listing them for sale together. Each item should be listed individually at the price suggested by the extension (as it is for single items), but the workflow would allow processing many items in one go, rather than repeating the process for each item.

Motivation / Use Case for Changing the Behavior

This feature would greatly speed up selling large numbers of items, making it much less tedious especially for users with big inventories. It would keep the existing price suggestion logic, but make workflow more efficient and less repetitive.