feat(ui): treat transparent addresses as mining-only addresses

DragonX is a private chain (-ac_private=1): consensus rejects any
non-coinbase output to a transparent address, so a t-address can only
ever receive mining rewards, and its coins can only move to a shielded
address. The wallet treated them like ordinary recipients.

Block paying one:
- Send: a transparent recipient shows "Mining address - can't be paid"
  and disables Review Send (tooltip explains; ask for a zs... address).
  Typing, paste, contacts and payment URIs all go through this field.
- Overview drag-to-transfer: a mining-address row is never a transfer
  target (it only reorders).
- Pool payout must be shielded (pools pay with ordinary transactions):
  field tooltip, disabled Start button and the start check say why.
- isValidRecipientAddress() is now shielded-only; new isDragonXAddress()
  and classifyRecipient() (Shielded / MiningOnly / Invalid).

Call them mining addresses:
- Overview: "Mining rewards" card (amber "Not yet shielded" when there
  is a balance; hover explains; click opens the Shield dialog), "New
  mining address" button with a tooltip, rows typed "Mining".
- QR / label dialogs, portfolio filter, contact badge ("Mining only"),
  Receive notifications.

i18n: 17 new keys in all 8 languages, 12 dead keys removed, CJK subset
rebuilt. Tests: recipient classification, translation completeness.
UI sweep: new "send-mining-recipient" target.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/ui/windows/balance_components.cpp

@@ -213,12 +213,13 @@ void RenderSharedAddressList(App* app, float listH, float availW,
         });
     }
     ImGui::SameLine();
-    if (TactileButton(TR("new_t_address"), ImVec2(buttonWidth, 0),
+    if (TactileButton(TR("new_mining_address"), ImVec2(buttonWidth, 0),
                       S.resolveFont(addrBtn.font.empty() ? "button" : addrBtn.font))) {
         app->createNewTAddress([](const std::string& addr) {
             DEBUG_LOGF("Created new t-address: %s\n", addr.c_str());
         });
     }
+    if (ImGui::IsItemHovered()) material::Tooltip("%s", TR("tt_new_mining_address"));
     ImGui::EndDisabled();
 
     ImGui::Dummy(ImVec2(0, Layout::spacingXs()));
@@ -402,13 +403,13 @@ void RenderSharedAddressList(App* app, float listH, float availW,
                     const auto& target = rows[s_dropTargetIdx];
                     material::Tooltip("%s\n%s\n\n%s %s",
                         truncateAddress(addr.address, 32).c_str(),
-                        row.isZ ? TR("shielded") : TR("transparent"),
+                        row.isZ ? TR("shielded") : TR("addr_type_mining"),
                         TR("transfer_to"),
                         truncateAddress(target.info->address, 32).c_str());
                 } else {
                     material::Tooltip("%s\n%s\n\n%s",
                         truncateAddress(addr.address, 32).c_str(),
-                        row.isZ ? TR("shielded") : TR("transparent"),
+                        row.isZ ? TR("shielded") : TR("addr_type_mining"),
                         TR("address_reorder_hint"));
                 }
             }
@@ -440,7 +441,8 @@ void RenderSharedAddressList(App* app, float listH, float availW,
             if (s_dragActive && s_dragIdx != row_idx && material::IsRectHovered(rowPos, rowEnd)) {
                 s_dropTargetIdx = row_idx;
                 const float relY = rowH > 0.0f ? (mousePos.y - rowPos.y) / rowH : 0.5f;
-                s_dropMode = (relY < 0.30f || relY > 0.70f) ? 1 : 0;
+                // A mining (transparent) address can't be paid, so it is never a transfer target: reorder only.
+                s_dropMode = (!row.isZ || relY < 0.30f || relY > 0.70f) ? 1 : 0;
                 if (s_dropMode == 0) {
                     // Transfer: highlight the whole target row.
                     dl->AddRectFilled(rowPos, rowEnd, WithAlpha(Primary(), 40), 4.0f * dp);
@@ -542,7 +544,7 @@ void RenderSharedAddressList(App* app, float listH, float availW,
                 // ---- Type label (first line) ----
                 float labelX = rowLayout.labelX;
                 {
-                    const char* typeLabel = row.isZ ? TR("shielded") : TR("transparent");
+                    const char* typeLabel = row.isZ ? TR("shielded") : TR("addr_type_mining");
                     const char* hiddenTag = row.hidden ? TR("hidden_tag") : "";
                     const char* miningTag = row.mining ? TR("mining_tag") : "";
                     char typeBuf[64];
@@ -682,7 +684,7 @@ void RenderSharedAddressList(App* app, float listH, float availW,
                         KeyExportDialog::show(addr.address, KeyExportDialog::KeyType::Viewing);
                 }
                 if (ImGui::MenuItem(TR("show_qr_code")))
-                    QRPopupDialog::show(addr.address, row.isZ ? TR("z_address") : TR("t_address"));
+                    QRPopupDialog::show(addr.address, row.isZ ? TR("z_address") : TR("mining_address"));
                 ImGui::Separator();
                 if (row.hidden) {
                     if (ImGui::MenuItem(TR("restore_address")))