feat: modernize address list with drag-transfer, labels, and UX polish

- Rewrite RenderSharedAddressList with two-pass layout architecture
- Add drag-to-transfer: drag address onto another to open transfer dialog
- Add AddressLabelDialog with custom label text and 20-icon picker
- Add AddressTransferDialog with amount input, fee, and balance preview
- Add AddressMeta persistence (label, icon, sortOrder) in settings.json
- Gold favorite border inset 2dp from container edge
- Show hide button on all addresses, not just zero-balance
- Smaller star/hide buttons to clear favorite border
- Semi-transparent dragged row with context-aware tooltip
- Copy-to-clipboard deferred to mouse-up (no copy on drag)
- Themed colors via resolveColor() with CSS variable fallbacks
- Keyboard nav (Up/Down/J/K, Enter to copy, F2 to edit label)
- Add i18n keys for all new UI strings

src/config/settings.h

@@ -5,6 +5,7 @@
 #pragma once
 
 #include <algorithm>
+#include <map>
 #include <string>
 #include <set>
 #include <vector>
@@ -141,6 +142,39 @@ public:
     void unfavoriteAddress(const std::string& addr) { favorite_addresses_.erase(addr); }
     int getFavoriteAddressCount() const { return (int)favorite_addresses_.size(); }
 
+    // Address metadata (labels, icons, custom ordering)
+    struct AddressMeta {
+        std::string label;
+        std::string icon;       // material icon name, e.g. "savings"
+        int         sortOrder = -1;  // -1 = auto (use default sort)
+    };
+    const AddressMeta& getAddressMeta(const std::string& addr) const {
+        static const AddressMeta empty{};
+        auto it = address_meta_.find(addr);
+        return it != address_meta_.end() ? it->second : empty;
+    }
+    void setAddressLabel(const std::string& addr, const std::string& label) {
+        address_meta_[addr].label = label;
+    }
+    void setAddressIcon(const std::string& addr, const std::string& icon) {
+        address_meta_[addr].icon = icon;
+    }
+    void setAddressSortOrder(const std::string& addr, int order) {
+        address_meta_[addr].sortOrder = order;
+    }
+    int getNextSortOrder() const {
+        int mx = -1;
+        for (const auto& [k, v] : address_meta_)
+            if (v.sortOrder > mx) mx = v.sortOrder;
+        return mx + 1;
+    }
+    void swapAddressOrder(const std::string& a, const std::string& b) {
+        int oa = address_meta_[a].sortOrder;
+        int ob = address_meta_[b].sortOrder;
+        address_meta_[a].sortOrder = ob;
+        address_meta_[b].sortOrder = oa;
+    }
+
     // First-run wizard
     bool getWizardCompleted() const { return wizard_completed_; }
     void setWizardCompleted(bool v) { wizard_completed_ = v; }
@@ -301,6 +335,7 @@ private:
     bool scanline_enabled_ = true;
     std::set<std::string> hidden_addresses_;
     std::set<std::string> favorite_addresses_;
+    std::map<std::string, AddressMeta> address_meta_;
     bool wizard_completed_ = false;
     int auto_lock_timeout_ = 900;   // 15 minutes
     int unlock_duration_ = 600;     // 10 minutes