feat(addresses): improve address labeling and view-only handling

- Add expanded address icon picker with search, bottom-aligned actions, and improved modal sizing
- Embed a pickaxe icon font subset and wire it into typography/address icon rendering
- Track view-only shielded addresses and prevent sends from non-spendable z-addresses
- Improve address transfer dialog sizing, max amount handling, and text clipping
- Tune main header layout values in ui.toml
- Update README, codebase overview, and third-party license documentation

src/ui/material/draw_helpers.h

@@ -90,10 +90,40 @@ inline void DrawTextShadow(ImDrawList* dl, const ImVec2& pos, ImU32 col,
 // and will return true even when a modal popup covers the rect, which
 // causes background elements to show hover highlights through dialogs.
 
+inline int& OverlayDialogActiveFrame()
+{
+    static int s_frame = -1;
+    return s_frame;
+}
+
+inline void MarkOverlayDialogActive()
+{
+    OverlayDialogActiveFrame() = ImGui::GetFrameCount();
+}
+
+inline bool IsCurrentWindowOverlayDialog()
+{
+    ImGuiWindow* window = ImGui::GetCurrentWindow();
+    for (ImGuiWindow* node = window; node; node = node->ParentWindow) {
+        if (node->Name && strcmp(node->Name, "##OverlayScrim") == 0)
+            return true;
+    }
+    return false;
+}
+
+inline bool IsOverlayDialogBlockingInput()
+{
+    int activeFrame = OverlayDialogActiveFrame();
+    int currentFrame = ImGui::GetFrameCount();
+    return activeFrame == currentFrame || activeFrame == (currentFrame - 1);
+}
+
 inline bool IsRectHovered(const ImVec2& r_min, const ImVec2& r_max, bool clip = true)
 {
     if (!ImGui::IsMouseHoveringRect(r_min, r_max, clip))
         return false;
+    if (IsOverlayDialogBlockingInput() && !IsCurrentWindowOverlayDialog())
+        return false;
     // If a modal popup is open and it is not the current window, treat
     // the content as non-hoverable (same logic ImGui uses internally
     // inside IsWindowContentHoverable for modal blocking).
@@ -885,8 +915,11 @@ inline bool DrawDialogTitleBar(const char* title, bool* p_open, ImU32 accent_col
 // Creates a fullscreen semi-transparent overlay with a centered card dialog.
 // Similar to the shutdown screen pattern but for interactive dialogs.
 
-inline bool BeginOverlayDialog(const char* title, bool* p_open, float cardWidth = 460.0f, float scrimOpacity = 0.92f)
+inline bool BeginOverlayDialog(const char* title, bool* p_open, float cardWidth = 460.0f, float scrimOpacity = 0.92f,
+                               float cardBottomViewportRatio = 0.85f)
 {
+    MarkOverlayDialogActive();
+
     ImGuiViewport* vp = ImGui::GetMainViewport();
     ImVec2 vp_pos = vp->Pos;
     ImVec2 vp_size = vp->Size;
@@ -914,6 +947,14 @@ inline bool BeginOverlayDialog(const char* title, bool* p_open, float cardWidth
     }
     
     ImDrawList* dl = ImGui::GetWindowDrawList();
+
+    // Consume pointer input on the scrim so the overlay owns clicks and wheel
+    // events even when the click lands outside the card content.
+    ImGui::SetCursorScreenPos(vp_pos);
+    ImGui::InvisibleButton("##OverlayInputBlocker", vp_size,
+                           ImGuiButtonFlags_MouseButtonLeft |
+                           ImGuiButtonFlags_MouseButtonRight |
+                           ImGuiButtonFlags_MouseButtonMiddle);
     
     // Calculate card position (centered)
     float cardX = vp_pos.x + (vp_size.x - cardWidth) * 0.5f;
@@ -921,7 +962,7 @@ inline bool BeginOverlayDialog(const char* title, bool* p_open, float cardWidth
     
     // Draw glass card background
     ImVec2 cardMin(cardX, cardY);
-    ImVec2 cardMax(cardX + cardWidth, vp_pos.y + vp_size.y * 0.85f);
+    ImVec2 cardMax(cardX + cardWidth, vp_pos.y + vp_size.y * cardBottomViewportRatio);
     
     // Card background with glass effect
     GlassPanelSpec cardGlass;
@@ -930,6 +971,11 @@ inline bool BeginOverlayDialog(const char* title, bool* p_open, float cardWidth
     cardGlass.borderAlpha = 50;
     cardGlass.borderWidth = 1.0f;
     DrawGlassPanel(dl, cardMin, cardMax, cardGlass);
+
+    if (p_open && ImGui::IsMouseClicked(ImGuiMouseButton_Left) &&
+        !ImGui::IsMouseHoveringRect(cardMin, cardMax, false)) {
+        *p_open = false;
+    }
     
     // Set up child region for card content
     ImGui::SetCursorScreenPos(ImVec2(cardX, cardY));