feat(transfer): add Send-tab guards, a correct TxID label + copy, inline reasons

The address-transfer dialog (own-address moves) enabled Confirm on amount alone,
so a disconnected / syncing / locked wallet failed only at submit. It now
mirrors the Send tab's guards (strictly more restrictive — the transfer logic is
unchanged) and re-checks live state before broadcast, shows an inline reason
when blocked (enter amount / not connected / syncing / locked), and labels the
result as a "Transaction ID" (not "Operation ID") with a copy button.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/ui/windows/address_transfer_dialog.h

@@ -141,6 +141,14 @@ public:
             double newFromBal = s_info.fromBalance - totalDeduct;
             double newToBal = s_info.toBalance + amount;
             bool amountValid = amount > 0 && totalDeduct <= s_info.fromBalance;
+            // Mirror the Send tab's guards (this dialog previously enabled Confirm on amount alone, so a
+            // disconnected / syncing / locked wallet would fail only at submit). These are own-address
+            // moves, but gating is strictly more restrictive — the transfer logic below is unchanged.
+            const auto& ws = s_app->getWalletState();
+            const bool connected = s_app->isConnected();
+            const bool syncing = ws.sync.syncing;
+            const bool liteLocked = s_app->liteWallet() && ws.isLocked();
+            const bool canTransfer = amountValid && !s_sending && connected && !syncing && !liteLocked;
 
             ImGui::Separator();
             ImGui::Spacing();
@@ -167,6 +175,19 @@ public:
                 ImGui::TextWrapped("%s", TR("insufficient_funds"));
                 ImGui::PopStyleColor();
             }
+            if (amount <= 0.0) {
+                ImGui::Spacing();
+                ImGui::PushStyleColor(ImGuiCol_Text, ImGui::ColorConvertU32ToFloat4(Error()));
+                ImGui::TextWrapped("%s", TR("send_tooltip_enter_amount"));
+                ImGui::PopStyleColor();
+            } else if (amountValid && (!connected || syncing || liteLocked)) {
+                ImGui::Spacing();
+                ImGui::PushStyleColor(ImGuiCol_Text, ImGui::ColorConvertU32ToFloat4(Warning()));
+                ImGui::TextWrapped("%s", !connected ? TR("send_tooltip_not_connected")
+                                                    : syncing ? TR("send_tooltip_syncing")
+                                                              : TR("transfer_tooltip_locked"));
+                ImGui::PopStyleColor();
+            }
             if (amountValid && newFromBal < 1e-9) {
                 ImGui::Spacing();
                 // Full-balance send: same warning-icon treatment as the de-shielding header above,
@@ -204,13 +225,13 @@ public:
             bool outConfirm = false;
             bool outClose = false;
             DialogActionFooter(s_sending ? sendingLabel : confirmLabel,
-                               amountValid && !s_sending,
+                               canTransfer,
                                cancelLabel, outConfirm, outClose, btnW);
 
             if (outClose) {
                 s_open = false;
             }
-            if (outConfirm) {
+            if (outConfirm && canTransfer) {   // re-check live state (the dialog persists across frames)
                 s_sending = true;
                 s_app->sendTransaction(s_info.fromAddr, s_info.toAddr,
                     amount, s_fee, "",
@@ -296,12 +317,19 @@ private:
             Type().textColored(TypeStyle::Caption, OnSurfaceMedium(), TR("transfer_sent_desc"));
             ImGui::Spacing();
             {
-                char buf[128];
-                snprintf(buf, sizeof(buf), TR("shield_operation_id"),
-                    s_resultMsg.size() > 40
-                        ? (s_resultMsg.substr(0, 20) + "..." + s_resultMsg.substr(s_resultMsg.size() - 10)).c_str()
-                        : s_resultMsg.c_str());
+                // The result is a TRANSACTION id, not an "Operation ID" — label it correctly and make
+                // it copyable.
+                std::string disp = s_resultMsg.size() > 40
+                    ? (s_resultMsg.substr(0, 20) + "..." + s_resultMsg.substr(s_resultMsg.size() - 10))
+                    : s_resultMsg;
+                char buf[160];
+                snprintf(buf, sizeof(buf), TR("transfer_txid_label"), disp.c_str());
                 Type().textColored(TypeStyle::Caption, OnSurfaceDisabled(), buf);
+                ImGui::SameLine();
+                if (ImGui::SmallButton(TR("grpb_copy"))) {
+                    ImGui::SetClipboardText(s_resultMsg.c_str());
+                    Notifications::instance().info(TR("copied_to_clipboard"));
+                }
             }
         } else {
             ImGui::Spacing();

src/util/i18n.cpp

@@ -1118,6 +1118,8 @@ void I18n::loadBuiltinEnglish()
         strings_["confirm_transfer"] = "Confirm Transfer";
         strings_["transfer_sent"] = "Transfer Sent";
         strings_["transfer_sent_desc"] = "Your transfer has been submitted to the network.";
+        strings_["transfer_txid_label"] = "Transaction ID: %s";
+        strings_["transfer_tooltip_locked"] = "Wallet is locked — unlock it to transfer";
         strings_["transfer_failed"] = "Transfer Failed";
         
         // Misc dialog strings