import: remediate review findings — ledger gate, docs, message split

Delegates the refuse-gate to ledgerDegraded(), lifts its console message into a
pure testable fold, fixes stale doc line citations and an inaccurate outcome-enum
comment, and splits the rename counter into collision-vs-sanitize.

src/shell/panel/panel_bank_ops.cpp

@@ -284,7 +284,14 @@ void showTabMenu(int screenX, int screenY, const std::string& bankId) {
         // Always a NEW bank, never a merge into the right-clicked one — the row sits
         // here because this is the panel's bank menu, not because it targets this bank.
         case kMenuImportPackage:
-            if (g_panel.session) doImportBankPackage(*g_panel.session);
+            if (g_panel.session) {
+                const std::string id = doImportBankPackage(*g_panel.session);
+                if (!id.empty()) {  // landed — show the freshly-imported bank
+                    g_panel.shownBankId = id;
+                    g_panel.focusedRegion = Region::Banks;
+                    invalidatePanel();
+                }
+            }
             break;
         default: break;
     }