Added support for Streamdeck Pedal and updated UI to better fit the Packed UI style

pirp/tools/migrate_journal_invoice_link.sql

@@ -0,0 +1,5 @@
+-- Journal-Rechnungen-Verknüpfung
+-- Fügt invoice_id zu journal_entries hinzu
+
+ALTER TABLE journal_entries ADD COLUMN IF NOT EXISTS invoice_id INTEGER REFERENCES invoices(id) ON DELETE SET NULL;
+CREATE INDEX IF NOT EXISTS idx_journal_entries_invoice ON journal_entries(invoice_id);