Spreadsheet users now see a proper confirmation dialog when merging cells that may affect existing content. This lets them either proceed or cancel, preventing accidental changes from a single OK-only prompt.

Steps to reproduce:
- open a spreadsheet
- set some content in A2
- select A1:A2
- hit the "Merge cells" icon button => a confirmation dialog opens but the only button is "OK". You should be able to cancel (or confirm)

With this commit, the confirmation dialog is used.

The Argentina VAT book ZIP export now avoids a system error when a foreign supplier is missing country or tax identification details. Instead of failing with a traceback, users receive a clear message explaining what partner information must be completed, helping accounting teams correct the data and continue reporting.

Task Adhoc: 29354
Task latam: 1052

**Steps to reproduce**:

Go to runbot Odoo master enterprise and install "l10n_ar_edi" module (Argentinean Electronic Invoicing).

Take position on Argentinian company (AR) (Responsable Inscripto) .

Create a vendor bill for foreign partner. It is necessary that the partner does not have a country_id or if it does, it is needed that it does not have VAT. Also it is required the invoice to have document type (66) DESPACHO DE IMPORTACIÓN. Another requirement is that the journal use documents.

Go to Accounting / Reporting / Statement Reports / Tax Report and click on button "VAT BOOK(ZIP)", previously select the period in which the invoice created in strep 3 is included.

**Current behavior**:

After clicking on "VAT BOOK(ZIP)" there is a bug with traceback.

**Expected behavior**:

After clicking on "VAT BOOK(ZIP)" there is no bug with traceback. The user receives a message to assign a country to the partner or assign a vat to the country.

**Video**:
https://drive.google.com/file/d/1zBLDsvsL1xa6PY6yHwgBZdajrzkgpGfp/view

This change updates Instagram-related handling in the website and social media areas as part of investigating blocked Instagram content. It should help teams better manage or diagnose Instagram display issues that may affect website visitors.

The Planning app calendar view has been corrected so users can switch to it without encountering an error. This keeps schedule viewing available and avoids disruption when managers review plans in calendar format.

This commit's purpose is to fix a traceback that appears when we switch to the calendar view in planning app.

step to reproduce :
- open planning app
- click on 'calendar' to switch view

details of the implementation :
Switched the this.env._t to the new standard use introduced by the refactor of the translations.

task - 3485773

This fix ensures spreadsheet chart extensions are loaded in the right order before the spreadsheet library starts. It helps prevent chart-related issues and keeps spreadsheet reports working reliably for users.

We now load the o-spreadsheet dependencies before the library itself to make sure we can insert our chart.js plugin extensions.

Task: 3482480