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/typography.cpp

@@ -101,6 +101,7 @@ bool Typography::reload(ImGuiIO& io, float dpiScale)
     loaded_ = false;
     for (int i = 0; i < kNumStyles; ++i) fonts_[i] = nullptr;
     for (int i = 0; i < kNumIconSizes; ++i) iconFonts_[i] = nullptr;
+    for (int i = 0; i < kNumIconSizes; ++i) pickaxeFonts_[i] = nullptr;
     return load(io, dpiScale);
 }
 
@@ -190,6 +191,13 @@ bool Typography::load(ImGuiIO& io, float dpiScale)
     iconFonts_[2] = loadIconFont(io, 24.0f * scale, "IconLarge");
     iconFonts_[3] = loadIconFont(io, 40.0f * scale, "IconXL");
 
+    // Load a one-glyph MDI subset for pickaxe. The glyph is remapped onto a
+    // BMP private-use codepoint so it remains renderable with 16-bit ImWchar.
+    pickaxeFonts_[0] = loadPickaxeFont(io, 14.0f * scale, "PickaxeSmall");
+    pickaxeFonts_[1] = loadPickaxeFont(io, 18.0f * scale, "PickaxeMed");
+    pickaxeFonts_[2] = loadPickaxeFont(io, 24.0f * scale, "PickaxeLarge");
+    pickaxeFonts_[3] = loadPickaxeFont(io, 40.0f * scale, "PickaxeXL");
+
     // Verify all fonts loaded
     bool allLoaded = true;
     for (int i = 0; i < kNumStyles; ++i) {
@@ -346,6 +354,51 @@ ImFont* Typography::loadIconFont(ImGuiIO& io, float size, const char* name)
     return font;
 }
 
+ImFont* Typography::loadPickaxeFont(ImGuiIO& io, float size, const char* name)
+{
+    if (g_mdi_pickaxe_subset_size == 0) {
+        DEBUG_LOGF("Typography: Pickaxe subset font is empty\n");
+        return nullptr;
+    }
+
+    void* fontDataCopy = IM_ALLOC(g_mdi_pickaxe_subset_size);
+    memcpy(fontDataCopy, g_mdi_pickaxe_subset_data, g_mdi_pickaxe_subset_size);
+
+    ImFontConfig cfg;
+    cfg.FontDataOwnedByAtlas = true;
+    cfg.OversampleH = 2;
+    cfg.OversampleV = 1;
+    cfg.PixelSnapH = true;
+    cfg.MergeMode = false;
+    cfg.GlyphMinAdvanceX = size;
+
+    static const ImWchar pickaxeRange[] = {
+        Typography::kPickaxeCodepoint,
+        Typography::kPickaxeCodepoint,
+        0,
+    };
+    cfg.GlyphRanges = pickaxeRange;
+
+    snprintf(cfg.Name, sizeof(cfg.Name), "MDIPickaxe %.0fpx", size);
+
+    ImFont* font = io.Fonts->AddFontFromMemoryTTF(fontDataCopy, g_mdi_pickaxe_subset_size, size, &cfg);
+    if (font) {
+        DEBUG_LOGF("Typography: Loaded pickaxe font %s (%.0fpx)\n", name, size);
+    } else {
+        DEBUG_LOGF("Typography: Failed to load pickaxe font %s\n", name);
+        IM_FREE(fontDataCopy);
+    }
+    return font;
+}
+
+ImFont* Typography::pickaxeFontForSize(float size) const
+{
+    if (size <= 15.0f) return pickaxeSmall();
+    if (size <= 20.0f) return pickaxeMed();
+    if (size <= 32.0f) return pickaxeLarge();
+    return pickaxeXL();
+}
+
 ImFont* Typography::getFont(TypeStyle style) const
 {
     int index = static_cast<int>(style);