The SMS composer warning message was simplified by removing the record count and adjusting the wording. This makes the message easier for users to understand without changing the underlying SMS sending behavior.

removed the first line from header warning of sms composer and
done some wording changes in header warning.

Task-ID-2728556

This update removes an unused internal reference from the mail composer screen. It does not change how users compose messages, but it helps keep the code simpler and easier to maintain.

This update modernizes internal parts of Odoo's Mail interface, including chats, messages, dialogs, attachments, emojis, and autocomplete inputs. It helps keep the messaging experience reliable and easier to maintain, with minimal direct change for end users.

Task-2694206

Additional checks were added to ensure spreadsheets continue to display correctly inside the document composer. This helps prevent unwanted layout issues such as extra scrollbars, keeping the user experience smooth when working with spreadsheets in Odoo Documents.

This commit adds some test to be sure the composer is still
behaving correctly when spreadsheet is added to Odoo.
typically it veryfies no scrollbars are added around the sheet.

task-id: 2643873