Users will no longer be repeatedly interrupted by the 'No subscription linked to your IoT Box' warning, as it now appears at most once every five minutes. The Point of Sale setup popup for a newly connected IoT box also has a clearer title, making the connection flow easier to understand.

This commit contains 2 small changes:
- The 'No subscription linked to your IoT Box' notification warning has been limited to trigger at most once every 5 minutes, as before it was spamming the user with repeat notifications.
- The title of the PoS autoconfigure popup upon connecting a new IoT box has been changed to 'Connect to a Point of Sale'.

task-4787508

The spreadsheet editing tools were updated to work with a revised file storage process introduced by recent clipboard improvements. This keeps image and file handling in spreadsheets aligned with the latest platform behavior, reducing compatibility issues for users.

Following the improvement of the clipboard (see https://www.odoo.com/odoo/2328/tasks/4235104) the record file store API was changed.

Task-4235104

This update helps prevent duplicate entries from being added to spreadsheet-related registries. It improves reliability by catching conflicting keys earlier, reducing the risk of inconsistent menu or field synchronization behavior.