Odoo adds a new communication service for IoT Boxes that first tries the usual longpolling connection and falls back to websockets if needed. This improves reliability for actions such as printing and point-of-sale hardware communication, while allowing the rollout to happen gradually.

This commit introduces a new `iot_http` service that allows performing an IoT action using longpolling then falling back sending a websocket message if the longpolling request fails.

This commit does not adapt all action call to use the service, nor removes the `iot_longpolling` service, in order to adapt progressively.

Community PR: odoo/odoo#207994
Task: 4283647

IoT Box cards now show more helpful details, including connected device counts, pairing dates, and related Point of Sale configurations. The pairing flow has also been reorganized and reworded to make setup easier and help users identify the right IoT Box faster.

We added back the amount of devices connected to an IoT Box on the IoT Box card. We also added the pairing date on the card, for a user to spot faster an IoT Box.

If an IoT Box is linked to a PoS, the PoS configs where devices are linked are now listed on the IoT Box cards.

Some elements have been moved, and some sentences have been rephrased on the wizards to pair an IoT Box.

Task: 4585446

The self-order kiosk IoT integration now uses device driver actions instead of direct remote calls. This should make kiosk setup and device interactions more consistent and easier to maintain, with limited visible change for day-to-day users.

Community PR: [https://github.com/odoo/odoo/pull/192652](https://github.com/odoo/odoo/pull/192652)

Spreadsheet auto-complete has been updated to work better with the latest spreadsheet changes, especially for relational fields. This improves consistency when users search or select spreadsheet-related data and keeps related sales spreadsheet tests aligned.

See https://github.com/odoo/odoo/pull/208294

The Gantt view now makes closed tasks less prominent and shows dependency lines from closed tasks as dashed or dotted. This helps users quickly distinguish completed work from active tasks while still understanding how tasks are connected.

`* = project_enterprise`

In this commit closed tasks in gantt view have lower opacity. When the source task in dependency is closed then resulting path is dashed/dotted.

task-4645818

Spreadsheet users now get autocomplete suggestions when navigating related fields in list-based formulas, making it easier to build accurate spreadsheet references. The update improves usability across spreadsheet features and aligns related tests with the new asynchronous autocomplete behavior.

Frontdesk now automatically emails visitors when their selected host is unavailable due to time off or an archived host record. This helps visitors know who to contact instead, reducing confusion at check-in.

This PR includes a feature to automatically send a mail to the visitor, when a record is created if the hosts are on time off, the visitor will be notified by email that your host is unavailable  you can contact to manager or responsible of frontdesk.

Additionally, it will notify visitors when the host record is achieved.

task-3790300

This update allows employees to have more than one active contract at the same time when those contracts do not depend on flexible schedules, planning, or attendance tracking. It helps support valid multi-contract situations while keeping stricter controls where scheduling or attendance conflicts could occur.

This PR refines the contract constraints by allowing multiple contracts to be in a running state simultaneously. An employee can have multiple active contracts only if the contracts are not flexible, planning-based, or attendance-based.

task-4374321