feat: blockchain rescan via daemon restart + status bar progress

- Fix z_importwallet to use full path instead of filename only
- Add rescanBlockchain() method that restarts daemon with -rescan flag
- Track rescan progress via daemon output parsing and getrescaninfo RPC
- Display rescan progress in status bar with animated indicator when starting
- Improve dark theme card contrast: lighter surface-variant, tinted borders, stronger rim-light

src/daemon/embedded_daemon.cpp

@@ -318,6 +318,12 @@ bool EmbeddedDaemon::start(const std::string& binary_path)
     for (const auto& cat : debug_categories_) {
         args.push_back("-debug=" + cat);
     }
+
+    // Add -rescan flag if requested (one-shot)
+    if (rescan_on_next_start_.exchange(false)) {
+        DEBUG_LOGF("[INFO] Adding -rescan flag for blockchain rescan\n");
+        args.push_back("-rescan");
+    }
     
     if (!startProcess(daemon_path, args)) {
         DEBUG_LOGF("[ERROR] Failed to start dragonxd process: %s\\n", last_error_.c_str());