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/rpc/connection.h

@@ -73,6 +73,20 @@ public:
      */
     static bool createDefaultConfig(const std::string& path);
 
+    /**
+     * @brief Ensure exportdir is set in DRAGONX.conf
+     * @param confPath Path to the conf file
+     * @return true if exportdir exists or was added
+     */
+    static bool ensureExportDir(const std::string& confPath);
+
+    /**
+     * @brief Ensure wallet encryption flags are set in DRAGONX.conf
+     * @param confPath Path to the conf file
+     * @return true if flags exist or were added
+     */
+    static bool ensureEncryptionEnabled(const std::string& confPath);
+
 private:
 };