This change improves how Odoo prepares its internal business models by processing model inheritance more efficiently. It is aimed at reducing memory pressure and improving reliability during large database setup operations, especially in enterprise environments.

Test case: `env.registry.setup_models(env.cr)` on a full enterprise database.

The mail activity menu now presents its empty-state helper message centered vertically and uses clearer congratulatory wording. This makes the systray experience feel more polished when users have completed all activities.

PURPOSE

- A helper should be aligned vertically in the systray menu.
- A sentence should also be changed by
  "Congratulations, you're done with your activities."

SPECIFICATION

- no activity statement should be changed and also it should
  be appear in the middle of the dropdown

task- 2525928

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Mail notification timestamps now stay gray instead of turning green when a thread is unread or needs action. This creates a more consistent and less distracting systray notification view for users.

The timestamp color should be gray instead of primary green even when the thread is unread or needs action.

Task id: 2383054

The mail app now uses a shared way to prepare attachment information, making it easier to reuse the same logic in other places. This is an internal improvement that helps keep attachment handling more consistent and easier to maintain.

This allows to reuse this formatter.

Part of task-2365881