Bug/accounting ps eu (#474)

* feat(api): implement commit functionality for journal entries

* fix(extensions): make ExtensionSettings.clear() a real delete so disconnect flows work

The 2026-03-30 multi-tenant refactor dropped all RLS policies on extension_data
and recreated only SELECT/INSERT/UPDATE. Combined with `value jsonb NOT NULL`,
every extension that called `settings.set(key, null)` to clear stored state
(cloud-backup disconnect, skatteverket OAuth/AGI cleanup, arcim-migration
consent reset) silently failed — the upsert hit the NOT NULL constraint and
the error was swallowed, leaving users stuck with stale connection rows.

Adds an `extension_data_delete` RLS policy, a `clear(key)` method backed by a
real DELETE, switches the four affected handlers, and makes `set()` throw on
Supabase error so this class of silent failure can't recur.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

* feat(journal-entries): add draft saving functionality to journal entry form

* feat: add periodisk sammanställning report generation and CSV export

- Implemented period date helpers in `period-dates.ts` for calculating start and end dates based on period type (monthly, quarterly, yearly).
- Created `periodisk-sammanstallning.ts` to generate the periodisk sammanställning report, including data fetching, validation, and warning handling.
- Developed CSV serializer in `periodisk-sammanstallning-csv.ts` for exporting the report in SKV574008 format.
- Added new columns to `company_settings` for storing periodisk sammanställning settings and tax contact information via migration.
- Introduced a new migration to add a `paid_with_private_funds` flag to `supplier_invoices` for tracking out-of-pocket expenses.
- Updated journal entries to include the new source type for privately paid supplier invoices.

* feat(migrations): add paid_with_private_funds flag to supplier_invoices and expand journal_entries.source_type CHECK

* fix(ai_requests): drop existing policies and trigger before creating new ones

* fix(migrations): ensure extension_data has a proper DELETE policy for ExtensionSettings.clear()

* fix(supplier-invoices): update error handling for invalid input in POST request

* fix: correct capitalization in project title

* fix(migrations): resolve duplicate version 20260513120000

Two migrations shared the same timestamp prefix, causing
schema_migrations_pkey collision on Supabase preview branches.
Bump extension_data_delete_policy to 20260513120001.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

components/settings/SettingsFormWrapper.tsx

@@ -56,6 +56,21 @@ export function SettingsFormWrapper({ children, onSave, className }: SettingsFor
       const result = await response.json()
 
       if (!response.ok) {
+        // Surface the specific Zod field message when the API sent a
+        // validation_error envelope — generic "Validation failed" is useless
+        // to the user.
+        if (
+          result?.type === 'validation_error'
+          && Array.isArray(result.errors)
+          && result.errors.length > 0
+        ) {
+          const messages = result.errors
+            .map((e: { message?: string }) => e.message)
+            .filter((m: unknown): m is string => typeof m === 'string' && m.length > 0)
+          if (messages.length > 0) {
+            throw new Error(messages.join(' • '))
+          }
+        }
         throw new Error(result.error || 'Kunde inte spara inställningar')
       }