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/ui/windows/peers_tab.cpp

@@ -550,9 +550,13 @@ void RenderPeersTab(App* app)
                 float iconSz = iconFont->LegacySize;
                 const char* label = isRefreshing ? TR("peers_refreshing") : TR("peers_refresh");
                 ImVec2 lblSz = ovFont->CalcTextSizeA(ovFont->LegacySize, FLT_MAX, 0, label);
+                // Use the wider label so button doesn't resize between states
+                ImVec2 altSz = ovFont->CalcTextSizeA(ovFont->LegacySize, FLT_MAX, 0,
+                    isRefreshing ? TR("peers_refresh") : TR("peers_refreshing"));
+                float maxLblW = std::max(lblSz.x, altSz.x);
                 float padH = Layout::spacingSm();
                 float padV = Layout::spacingSm();
-                float btnW = padH + iconSz + Layout::spacingXs() + lblSz.x + padH;
+                float btnW = padH + iconSz + Layout::spacingXs() + maxLblW + padH;
                 float btnH = std::max(iconSz, lblSz.y) + padV * 2;
                 float btnX = ImGui::GetWindowPos().x + availWidth - btnW - Layout::spacingSm();
                 float btnY = toggleY + (toggleH - btnH) * 0.5f;