feat(i18n,mining): translate warmup block/tx-type labels; fix the disconnected-solo mine tooltip

- Warmup/daemon status no longer appends a hardcoded English " (Block N)" — it
  uses a translated warmup_block_fmt key.
- Recent-transaction type labels (Sent/Received/Mined) are now translated in the
  UI consumer (recentTypeLabel in balance_recent_tx.cpp) with a generic
  "Transaction" fallback, instead of the data layer's raw English getTypeDisplay().
- Mining: a disconnected solo miner hovering the dead Mine button now gets a
  "not connected to the node" tooltip instead of a misleading "Start Mining"
  (the tooltip chain had no branch for the solo !isConnected() disable).

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

src/util/i18n.cpp

@@ -1223,6 +1223,7 @@ void I18n::loadBuiltinEnglish()
         strings_["shielded_self_type"] = "Shielded";
         strings_["immature_type"] = "Immature";
         strings_["mined_type"] = "Mined";
+        strings_["tx_type_generic"] = "Transaction";
         strings_["mature"] = "Mature";
         strings_["copy_txid"] = "Copy TxID";
         strings_["view_details"] = "View Details";
@@ -1944,6 +1945,7 @@ void I18n::loadBuiltinEnglish()
         strings_["toast_finish_send_first"] = "Finish or cancel the pending send before switching wallets.";
         strings_["toast_rescan_complete"] = "Blockchain rescan complete.";
         strings_["toast_rescan_from_fmt"] = "Rescanning the blockchain from block %d — this can take a while.";
+        strings_["warmup_block_fmt"] = "(Block %d)";
         strings_["toast_solo_unavailable_lite"] = "Solo mining isn't available in the lite wallet.";
         strings_["toast_pool_unavailable"] = "Pool mining isn't available in this build.";
         strings_["toast_no_address_generate_z"] = "No wallet address yet — generate a shielded (Z) address in the Receive tab.";
@@ -2354,6 +2356,7 @@ void I18n::loadBuiltinEnglish()
         strings_["mining_stopping"] = "Stopping...";
         strings_["mining_stopping_tooltip"] = "Miner is stopping...";
         strings_["mining_syncing_tooltip"] = "Blockchain is syncing...";
+        strings_["mining_not_connected_tooltip"] = "Not connected to the node. Wait for the daemon to connect before mining.";
         strings_["mining_to_save"] = "to save";
         strings_["mining_today"] = "Today";
         strings_["mining_uptime"] = "Uptime";