fix: Tier-3 feature gaps — transfer result screen + accurate RPC display

- Address-transfer dialog closed itself on submit (s_open=false the same frame),
  so its in-dialog result screen was dead code. Keep the dialog open on submit:
  s_sending drives the button to a disabled "Sending…" state, and the async
  callback's result (success txid / error) now shows in the result screen with
  its own Close button.
- Settings RPC connection editor was inert AND showed compile-time defaults.
  Populate Host/Port/Username/Password from the auto-detected daemon config
  (rpc::Connection::autoDetectConfig) and make the fields read-only — the RPC
  credentials come from the daemon's DRAGONX.conf, so these now accurately
  DISPLAY the live connection instead of pretending to be an editor (which did
  nothing). The existing "auto-detected" note now matches the behaviour.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/ui/windows/address_transfer_dialog.h

@@ -226,7 +226,9 @@ public:
                             Notifications::instance().error(result.empty() ? TR("transfer_failed") : result);
                         }
                     });
-                s_open = false;
+                // Keep the dialog OPEN on submit: s_sending drives the button to a disabled "Sending…"
+                // state, and when the async callback sets s_resultMsg the in-dialog result screen shows
+                // (with its own Close button). Previously closing here made that result screen dead code.
             }
             ImGui::EndDisabled();