In this commit:
-------------------

- A new field `l10n_de_vat_export_identifier` on tax records to store the correct Fiskaly Export ID.
- Extended export logic that supports a wide range of common business scenarios.
- Support for registering and using non-standard or manually configured tax entries as needed.

**VAT Mapping Logic**

By default, taxes follow the standard VAT definitions outlined in Fiskaly’s documentation:
https://developer.fiskaly.com/api/dsfinvk/v1#tag/VAT-Definition

- The export ID is automatically assigned for standard tax rates.
- For custom or historical tax configurations, users can override the value manually.
- Even non-standard or random tax records can be registered and used in compliant export formats.

Special case for 0% VAT:
- If the assigned tax grid is 21, 45, or not set → Export ID 5 (non-taxable)
- Otherwise → Export ID 6 (0% but taxable)

**Business Case Handling**

The following POS business scenarios are now fully supported with accurate Fiskaly export types:

**Gift Cards**
- Sale → MehrzweckgutscheinKauf
- Redemption → MehrzweckgutscheinEinloesung

**Down Payments**
- Payment → Anzahlungseinstellung
- Liquidation → Anzahlungsaufloesung

**Tips**
- If 0% VAT with grid 21, 45, or no tax → Tip to employee → TrinkgeldAN
- All others → Tip to employer → TrinkgeldAG

**Discounts**
- Global discount → Rabatt
- Line-level discounts handled via `discounts_per_vat_id`

**Customer Account (Receivable) Payments**
- Deposits into customer account → MehrzweckgutscheinKauf
- Payments via customer account:
  - Adjustment line (0 payment) → MehrzweckgutscheinEinloesung or Forderungsentstehung
  - Main sale line → Umsatz (Consider as normal sale)
- Settlements:
  - If invoiced → Forderungsaufloesung
  - If not invoiced → MehrzweckgutscheinKauf

**Cash Discrepancies**
- Exported appropriately based on over/short

**Cash Movements (via cash_flow_reason)**
- Private Reason
- Cash Transfer
- Payout / Deposit
- Wage Payment / Cash Supplement

These enhancements ensure that a wide range of real-world POS operations are supported out-of-the-box, making it easier for users in Germany to stay compliant with Fiskaly export requirements.

Task: 4660560

This pull request introduces several user interface enhancements, with a strong emphasis on improving usability on **mobile devices**:

- **Top Bar Redesign**: The top bar has been restructured to enhance the mobile experience. On smaller screens, buttons for toggling the property panel, chatter, comments, and adding/removing articles from favorites have been moved into a consolidated "More Options" menu. This change creates more space for displaying the article hierarchy and breadcrumb navigation, improving readability and navigation clarity.
- **Permission Panel as Full-Screen Modal**: Previously displayed as a popover, the permission panel will now open as a full-screen modal on mobile devices. This update reduces the risk of accidental closure and offers a more focused, user-friendly interface for managing permissions.
- **Clearer Permission Labeling**: To address confusion around the internal "none" permission setting, the label has been updated to "Members only". This change makes it clear that access is restricted to member sets defined on the article.
- **Enhanced Avatar Display**: Portal users will now see actual member avatars instead of generic user icons. This update adds a personal touch and improves visual engagement throughout the interface.
- **UI Refinements**: Minor but impactful adjustments have been made, including correcting element misalignments and introducing clearer visual cues to guide users more effectively through the interface.

Task-4636494

[IMP] l10n_fr_reports, l10n_fr_intrastat: Account returns integrations

Add account return integrations for France:
    - Vat Return
    - Intrastat

This includes the VAT EDI integrations in account return. Now you can directly submit your vat declarations from an account return.

The submit button on account return now opens directly the EDI VAT wizard, so the user can submit automatically from there. Once the submission is properly done, we mark the return as Submitted.

Same goes for intrastat.

task-4844276

[FIX] l10n_fr_reports: fix tax report pdf inconsistency

When you validate a tax return, it will lock the date and generate the pdf for the tax report.

In France with the edi, if you have to send a reimbursement declaration, the remaining value of this reimbursement will be carryover for the next period, moving the value from line 27 to line 26.

With this change, the pdf of the report will change as well, but we still keep the old pdf in the return attachments, which mean we have 2 pdf with different values for the same tax period.

With this commit, we regenerate the pdf once the reimbursement declaration is sent, with the good values.

Also, if the user reset the account return, the external value originally created when validating is deleted.

task-4844276, task-4932427

[FIX] account_reports: fix return periodicity options

Return periodicity options are supposed to be used to define the report period when opening it from account return.

But in some cases like Intrastat, if you have multiple localizations with intrastat return type, we won't generate the return periodicity options, as we only do if we have 1 return type.

This commit add a new condition on return type we use, checking the country. So if we have one return type for intrastat BE, and one for intrastat FR, we take the good return type based on env company.

IMPORTANT: from now on, each new localization return type should define a country on it.

no-task

[IMP] account_reports: export_file next_action

By default, export_file action in account reports return a 'ir.actions.act_window_close' action.

This commit adds the 'next_action' params to the export_file function, letting the dev choose a different action to execute after the export is done.

no-task

[IMP] account_reports: add new action_reset

Add a new action_reset function to deal with 2 states (submitted, reviewed) reports. This function comes from l10n_be_reports and will be used mainly for intrastat.

no-task

_* = hr_sign, documents_sign

Before:
- Users could only send documents for signing using existing templates.
- To send a new document, they had to go to the Sign app, upload the PDF,
  create a template, and then send it.
- All fields in the wizard were shown even if no template was selected.
- A separate section (notebook) was used to add contacts in copy.
- Subject of the mail send to signer was not containing details related to
  reference record.
- Upload PDF button was visible to user from wizard when user click on
  search more in templates. which was of no use as it was not liking
  base record with referrence_doc.
- Users couldn’t upload files from the Documents app when sending a document
  for signature.
- Users couldn’t use AI to help write the message when requesting a signature.
- Users couldn’t schedule the email for the sign request.

After:
- Added a new button in the signature request wizard that lets users upload a
  PDF directly and edit it in sign app. without need to manually go to sign app
  then upload pdf and later use it.
- Too achieve that Reused an existing widget from hr_sign and moved it to the
  sign module to make it available for broader use.
- Fields in the wizard now appear only after a template is selected or available
  by default.
- Removed the extra notebook section and combined all fields in one place for a
  cleaner layout.
- Add detail of reference record in subject of email send to signer.
- Now users can upload files from the Documents app when sending for signature.
- Users can use AI to draft the message. 
- Rename field 'message' to 'body' to make it compatible with
  `mail_composer_chatgpt` wizard.
- Users can schedule the sign request email to be sent later.

Impact:
- Makes the document signing process faster and easier for users.
- Reduces the number of steps needed to send a new document for signature.
- Provides a smoother and more user-friendly interface.
- Helps avoid confusion by only showing relevant fields when needed.
- Users can attach the right files directly, get AI help for messages, and
  plan exactly when the request should be sent.

task-4942867