feat: add user locale preference to user_preferences table (#555)

* feat: add user locale preference to user_preferences table

- Introduced a new column 'locale' in the user_preferences table to store per-user UI language preferences.
- Added a CHECK constraint to ensure only supported locales ('sv', 'en') are allowed.
- Triggered a schema reload notification for the changes.

chore: declare CSS module support in TypeScript

- Added a declaration for CSS modules in globals.d.ts to enable TypeScript support for importing CSS files.

* feat: add Swish as an invoice payment method in company settings

lib/extensions/i18n.ts

@@ -0,0 +1,95 @@
+// Translation key lookup for extension and sector slugs.
+//
+// Extension manifests ship Swedish-only names/descriptions in the data layer
+// (lib/extensions/_generated/sector-definitions.ts and lib/extensions/sectors.ts).
+// Translation happens at the render layer via these slug → key helpers.
+//
+// For known slugs, return the translation key under the `extensions` namespace.
+// For unknown slugs, return null — callers fall back to the manifest values.
+
+export function extensionNameKey(slug: string): string | null {
+  switch (slug) {
+    case 'enable-banking':
+      return 'ext_enable_banking_name'
+    case 'email':
+      return 'ext_email_name'
+    case 'arcim-migration':
+      return 'ext_arcim_migration_name'
+    case 'tic':
+      return 'ext_tic_name'
+    case 'mcp-server':
+      return 'ext_mcp_server_name'
+    case 'cloud-backup':
+      return 'ext_cloud_backup_name'
+    case 'skatteverket':
+      return 'ext_skatteverket_name'
+    case 'invoice-inbox':
+      return 'ext_invoice_inbox_name'
+    default:
+      return null
+  }
+}
+
+export function extensionDescriptionKey(slug: string): string | null {
+  switch (slug) {
+    case 'enable-banking':
+      return 'ext_enable_banking_description'
+    case 'email':
+      return 'ext_email_description'
+    case 'arcim-migration':
+      return 'ext_arcim_migration_description'
+    case 'tic':
+      return 'ext_tic_description'
+    case 'mcp-server':
+      return 'ext_mcp_server_description'
+    case 'cloud-backup':
+      return 'ext_cloud_backup_description'
+    case 'skatteverket':
+      return 'ext_skatteverket_description'
+    case 'invoice-inbox':
+      return 'ext_invoice_inbox_description'
+    default:
+      return null
+  }
+}
+
+export function extensionLongDescriptionKey(slug: string): string | null {
+  switch (slug) {
+    case 'enable-banking':
+      return 'ext_enable_banking_long_description'
+    case 'email':
+      return 'ext_email_long_description'
+    case 'arcim-migration':
+      return 'ext_arcim_migration_long_description'
+    case 'tic':
+      return 'ext_tic_long_description'
+    case 'mcp-server':
+      return 'ext_mcp_server_long_description'
+    case 'cloud-backup':
+      return 'ext_cloud_backup_long_description'
+    case 'skatteverket':
+      return 'ext_skatteverket_long_description'
+    case 'invoice-inbox':
+      return 'ext_invoice_inbox_long_description'
+    default:
+      return null
+  }
+}
+
+export function sectorNameKey(slug: string): string | null {
+  switch (slug) {
+    case 'general':
+      return 'sector_general_name'
+    default:
+      return null
+  }
+}
+
+export function sectorDescriptionKey(slug: string): string | null {
+  switch (slug) {
+    case 'general':
+      return 'sector_general_description'
+    default:
+      return null
+  }
+}