This update removes now-unneeded internal declarations from several Odoo Enterprise apps because the platform handles them automatically. There is no expected change for end users, but it simplifies maintenance and reduces the chance of future inconsistencies.

\* = approvals, documents, sign, voip

Inverses of identifying fields are now automatically causal. This commit therefore removes the unnecessary declarations of `isCausal: true` from the code.

Task-2741402
Community: https://github.com/odoo/odoo/pull/100119

Appraisal goal assignment notifications were updated to be easier for users to understand. This helps employees and managers quickly recognize why they received a notification and what document needs their attention.

Ease the understanding of the notifications sent when users are assigned to a document.

Task-2801600

This update reorganizes how XML templates are registered across many Odoo Enterprise apps by declaring them directly in each app manifest. The change aligns Enterprise with the community platform refactoring and should make template loading more consistent, with little direct impact on day-to-day users.

Several pop-up windows in Appointment, Knowledge, and Marketing Automation now open at a medium size. This makes actions like sharing appointment links, inviting people, moving articles, and launching test campaigns feel more focused and easier to use.

With this PR, size of the following wizards are reduced to 'medium':

1. Launch a test (Marketing Automation)
2. Move an article (Knowledge)
3. Invite people (Knowledge)
4. Share Link (Appointment)

taskID- 2701035

This update adds an explanatory note in the spreadsheet edition code about a previous graph-related adjustment. It helps future maintainers understand why the change exists, reducing the chance of accidental regressions without changing user-facing behavior.

Following 47173f10cc4f8fbe4c4bd6f862a19903e6400193, a little comment to explain why we did this patch could be useful.