feat(invoices): ROT/RUT payout file dialog and file guards (#1380)

* feat(invoices): ROT/RUT payout file dialog and file guards

Rebuild the UI for the existing headless HUS V6 payout-file flow
(demanded via #789): a dialog on the invoices page to pick eligible
paid ROT/RUT invoices, generate the XML, download it and track
request status. Adds file-level guards from the Skatteverket spec:
future payment dates blocked, one file per payment year, max 100
cases per file, with per-invoice blocker messages.

Submission stays manual (upload + sign in the SKV e-service);
no direct submission API exists.

Fixes #789

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

* fix(invoices): compute rot-rut gating date in Europe/Stockholm

The candidate and begäran date defaults used the UTC calendar day,
which near midnight Swedish time could wrongly block or admit an
invoice via FUTURE_PAYMENT_DATE and shift the 31 January deadline
warning. Use getSwedishLocalDate() like the bookkeeping engine.
Raised by the Swedish compliance review on PR #1380.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

---------

Co-authored-by: Claude Fable 5 <noreply@anthropic.com>

messages/en.json

@@ -3074,7 +3074,51 @@
     "to_pay_label": "Amount to pay",
     "total_incl_vat_label": "Total incl. VAT",
     "review_customer_missing_title": "Customer details could not be loaded",
-    "review_customer_missing_description": "Reload the page and try again. Contact support if the problem persists."
+    "review_customer_missing_description": "Reload the page and try again. Contact support if the problem persists.",
+    "rot_rut_payout_action": "ROT/RUT file",
+    "rot_rut_payout_title": "Request a ROT/RUT payout",
+    "rot_rut_payout_description": "Select paid invoices and download an XML file for Skatteverket's e-service. The file is not submitted automatically: upload and sign it at Skatteverket.",
+    "rot_rut_type_aria": "Select deduction type",
+    "rot_rut_type_rot": "ROT",
+    "rot_rut_type_rut": "RUT",
+    "rot_rut_year_aria": "Select payment year",
+    "rot_rut_loading": "Loading ROT/RUT details",
+    "rot_rut_load_failed_title": "Could not load the ROT/RUT details",
+    "rot_rut_load_failed_description": "Reload the page and try again.",
+    "rot_rut_eligible_title": "Invoices to include",
+    "rot_rut_selected_count": "{selected} selected · {amount}",
+    "rot_rut_select_all": "Select all",
+    "rot_rut_clear_selection": "Clear selection",
+    "rot_rut_no_eligible_title": "No invoices are ready",
+    "rot_rut_no_eligible_description": "A paid ROT or RUT invoice appears here once its buyer details are complete.",
+    "rot_rut_paid_at": "Paid {date}",
+    "rot_rut_max_cases_help": "Skatteverket allows at most {count} cases in one file. Create multiple files if you need to request more invoices.",
+    "rot_rut_generate_file": "Create and download file",
+    "rot_rut_generating_file": "Creating file…",
+    "rot_rut_generated_title": "The ROT/RUT file was downloaded",
+    "rot_rut_generated_description": "Upload the file in Skatteverket's e-service and sign the request there.",
+    "rot_rut_generate_failed_title": "Could not create the ROT/RUT file",
+    "rot_rut_blocked_title": "Cannot be included ({count})",
+    "rot_rut_history_title": "Previous files",
+    "rot_rut_upload_help": "After uploading and signing at Skatteverket, mark the file as uploaded here.",
+    "rot_rut_history_empty": "No files have been created for this deduction type.",
+    "rot_rut_history_meta": "{date} · {count} cases · {amount}",
+    "rot_rut_status_generated": "Created",
+    "rot_rut_status_submitted": "Uploaded",
+    "rot_rut_status_paid": "Approved",
+    "rot_rut_status_partially_paid": "Partly approved",
+    "rot_rut_status_rejected": "Rejected",
+    "rot_rut_status_cancelled": "Cancelled",
+    "rot_rut_download_again": "Download again",
+    "rot_rut_cancel_request": "Cancel",
+    "rot_rut_mark_uploaded": "Mark as uploaded",
+    "rot_rut_uploaded_title": "The file is marked as uploaded",
+    "rot_rut_cancelled_title": "The request was cancelled",
+    "rot_rut_update_failed_title": "Could not update the request",
+    "rot_rut_download_failed_title": "Could not download the file",
+    "rot_rut_download_timeout": "The download took too long. Try again.",
+    "rot_rut_download_network": "The file could not be downloaded. Check your connection and try again.",
+    "rot_rut_skatteverket_link": "Open ROT and RUT at Skatteverket"
   },
   "invoice_review": {
     "assigned_number_prefix": "Will be assigned invoice number",