The mail area now handles attachment box actions through the underlying conversation data model instead of the visible page components. This makes attachment behavior more consistent and easier to maintain, with little direct change expected for users.

Part of task-2579306

This update improves wording around chart template accounts so their purpose is easier to understand. It also removes an outdated internal comment that could cause confusion for future maintenance, with no expected change to day-to-day accounting workflows.

The commit also delete obsolete comment "Set default cash difference account on
company" which meant to be for another code, not for creating of suspense accounts

Description of the issue/feature this PR addresses:

Current behavior before PR:

Desired behavior after PR is merged:




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