feat: add ignore menu item to transaction inbox card (#758)

Imported bank transactions can now be hidden from the inbox via a new
"Ignorera transaktion" item in the ⋯ overflow menu. The backend
(POST/DELETE /api/transactions/[id]/ignore) and the is_ignored DB column
already existed; this wires up the missing UI affordance.

- TransactionInboxCard: add onIgnore prop + EyeOff menu item (imported
  rows only — manually created rows use delete instead)
- page.tsx: pass onIgnore={handleIgnoreTransaction} to the card; add
  handleBatchIgnore for the batch action bar's new "Ignorera" button
- sv.json / en.json: add ignore_btn translation key to tx_inbox_card

Signed-off-by: Jonas Flodén <jonas@floden.nu>
Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

messages/en.json

@@ -1720,6 +1720,7 @@
     "match_voucher_btn": "Match to existing voucher",
     "attach_document_btn": "Match to document",
     "more_actions_aria": "More actions",
+    "ignore_btn": "Ignore transaction",
     "delete_aria": "Delete transaction",
     "edit_title_aria": "Edit title",
     "edited_badge": "edited",

messages/sv.json

@@ -1720,6 +1720,7 @@
     "match_voucher_btn": "Matcha mot befintlig verifikation",
     "attach_document_btn": "Matcha mot underlag",
     "more_actions_aria": "Fler åtgärder",
+    "ignore_btn": "Ignorera transaktion",
     "delete_aria": "Ta bort transaktion",
     "edit_title_aria": "Ändra titel",
     "edited_badge": "redigerad",