fix(python): TOTP codes must honor the entry's period and digits

TotpManager built pyotp.TOTP(secret) with library defaults (6 digits, 30s)
and ignored what the entry recorded, so any imported or derived entry using
other values produced codes the issuing service rejects. The service was
configured from the entry's values -- those govern the code.

- current_code_from_secret and current_code take period/digits
- EntryManager.get_totp_code passes the entry's values for both the
  derived and imported paths
- display_service, menu_handler (totp_list now carries digits) and the GUI
  updated at every call site
- regression tests for imported and deterministic entries with custom
  parameters, asserting against pyotp with the matching interval/digits,
  and confirming default entries are byte-identical to before

Found by scripts/cross_impl_check.py, which flagged it as a divergence
against the TypeScript port. That allowance is now removed: the suite
asserts TOTP equality and reports 30/30 with zero divergences.

Co-Authored-By: Claude Fable 5 <[email protected]>

src/seedpass_gui/app.py

@@ -403,6 +403,7 @@ class TotpViewerWindow(toga.Window):
             entry = self.entries.retrieve_entry(idx)
 
             period = int(entry.get("period", 30)) if entry else 30
+            digits = int(entry.get("digits", 6)) if entry else 6
             remaining = TotpManager.time_remaining(period)
             if hasattr(self.entries, "get_totp_secret"):
                 if idx in self._secret_cache:
@@ -414,7 +415,9 @@ class TotpViewerWindow(toga.Window):
                     except Exception:
                         # Skip entries where secret cannot be derived (e.g. no seed)
                         continue
-                code = TotpManager.current_code_from_secret(secret)
+                code = TotpManager.current_code_from_secret(
+                    secret, period=period, digits=digits
+                )
             else:
                 # Compatibility path for services exposing code retrieval directly.
                 code = self.entries.get_totp_code(idx)