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.h

@@ -152,6 +152,12 @@ public:
     void setDebugCategories(const std::set<std::string>& cats) { debug_categories_ = cats; }
     const std::set<std::string>& getDebugCategories() const { return debug_categories_; }
 
+    /**
+     * @brief Request a blockchain rescan on the next daemon start
+     */
+    void setRescanOnNextStart(bool v) { rescan_on_next_start_ = v; }
+    bool rescanOnNextStart() const { return rescan_on_next_start_.load(); }
+
     /** Get number of consecutive daemon crashes (resets on successful start or manual reset) */
     int getCrashCount() const { return crash_count_.load(); }
     /** Reset crash counter (call on successful connection or manual restart) */
@@ -189,6 +195,7 @@ private:
     std::atomic<bool> should_stop_{false};
     std::set<std::string> debug_categories_;
     std::atomic<int> crash_count_{0};  // consecutive crash counter
+    std::atomic<bool> rescan_on_next_start_{false};  // -rescan flag for next start
 };
 
 } // namespace daemon