Phase 2: iban/bic instead of bankDetails, matching the backend collection

CompanySettings type now mirrors the payload repo's split bankDetails ->
iban/bic (see that repo's own commit for the reasoning). No behavior
change here beyond the type/fallback update — the actual footer
rendering lives in @einfach-produktiv/invoicing.

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

package-lock.json

@@ -294,7 +294,7 @@
     },
     "node_modules/@einfach-produktiv/invoicing": {
       "version": "0.1.0",
-      "resolved": "git+https://git.mk360.de/Marco/einfach-produktiv-invoicing.git#9336cfd0ba7faf1148fd56e7254e52fc016b9130",
+      "resolved": "git+https://git.mk360.de/Marco/einfach-produktiv-invoicing.git#62821ddc8af053146d8d4a02b54a79791c93e419",
       "peerDependencies": {
         "@react-pdf/renderer": "^4.0.0",
         "react": "^19.0.0"