feat:Regenerate invoice QR codes with the KRA eTIMS URL once it is av…

[maniamartial]

1. Auto-regenerate QR with eTIMS URL when etims_qr_code_url is received:

   • On successful eTIMS submission (sales_information_submission_on_success)
   • When ledger sync runs (update_sales_invoice_etims_details)

2. Regenerate QR Code button now prefers etims_qr_code_url over the site verification URL.

3. Smarter ledger lookup via get_etims_ledger_for_verification():

• Prefers ledger matching current reference_number (e.g. SINV-0001-REV1)
• Orders by is_signed desc, creation desc instead of arbitrary first match

Still under testing,

[muruthigitau]

There's a new setting to enable verification url. By default it's disabled on version-15

Check this feature here - 2933b7f