feat(contacts): avatars in Table view + prune orphaned avatar images

- Table view now shows the same avatar (image / icon / Z-T badge) before each
  contact's label, drawn after the row Selectable so its highlight doesn't
  paint over it — visual parity with Cards/List.
- When a contact's custom image avatar is replaced (edit) or the contact is
  deleted, its now-unused file in <config>/contact-avatars/ is removed
  (pruneOrphanAvatar) — but only if no other contact still references it and
  the path is inside our managed dir, and its cached texture is dropped too.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/ui/windows/contacts_tab.cpp

@@ -157,6 +157,24 @@ static std::string copyAvatarImage(const std::string& srcPath) {
     return ec ? std::string() : dst.string();
 }
 
+// Delete a no-longer-referenced avatar image file. Call AFTER the address book has been updated with
+// `oldAvatar`'s reference removed: if `oldAvatar` is an "img:" avatar that no contact still uses AND it
+// lives inside our managed <config>/contact-avatars/ dir (never touch anything outside it), remove the
+// file and drop its cached texture. A no-op for badge/icon avatars or a still-shared image.
+static void pruneOrphanAvatar(const std::string& oldAvatar, const data::AddressBook& book) {
+    if (oldAvatar.rfind("img:", 0) != 0) return;
+    for (const auto& e : book.entries()) if (e.avatar == oldAvatar) return;   // still referenced elsewhere
+    namespace fs = std::filesystem;
+    std::error_code ec;
+    const std::string path = oldAvatar.substr(4);
+    fs::path managed = fs::weakly_canonical(fs::path(util::Platform::getConfigDir()) / "contact-avatars", ec);
+    fs::path target  = fs::weakly_canonical(fs::path(path), ec);
+    // Only prune files actually inside the managed dir (guards against a hand-edited external path).
+    if (managed.empty() || target.string().rfind(managed.string(), 0) != 0) return;
+    fs::remove(target, ec);
+    invalidateAvatarTexture(path);
+}
+
 void RenderContactsTab(App* app)
 {
     auto& S = schema::UI();
@@ -202,7 +220,9 @@ void RenderContactsTab(App* app)
     auto doDelete = [&]() {
         if (!selValid()) return;
         if (s_confirm_delete_idx == s_selected_index) {
+            std::string removedAvatar = book.entries()[s_selected_index].avatar;
             book.removeEntry(s_selected_index);
+            pruneOrphanAvatar(removedAvatar, book);   // drop its image if no other contact uses it
             s_selected_index = -1;
             s_confirm_delete_idx = -1;
             Notifications::instance().success(TR("address_book_deleted"));
@@ -630,7 +650,11 @@ void RenderContactsTab(App* app)
                 // (pre-connect) — better a visible-everywhere contact than one orphaned to no wallet.
                 entry.scope = (s_edit_global || activeHash.empty()) ? std::string("global") : activeHash;
                 if (isEdit) {
+                    // Capture the previous avatar so we can prune its now-unused image after the update.
+                    std::string prevAvatar = (s_selected_index >= 0 && s_selected_index < (int)app->addressBook().size())
+                                           ? app->addressBook().entries()[s_selected_index].avatar : std::string();
                     if (app->addressBook().updateEntry(s_selected_index, entry)) {
+                        if (prevAvatar != entry.avatar) pruneOrphanAvatar(prevAvatar, app->addressBook());
                         Notifications::instance().success(TR("address_book_updated"));
                         s_show_edit_dialog = false;
                     } else {
@@ -824,8 +848,16 @@ void RenderContactsTab(App* app)
                 const auto& entry = book.entries()[i];
                 ImGui::TableNextRow();
                 ImGui::PushID(static_cast<int>(i));
+                const bool shielded = isShieldedAddr(entry.address);
                 ImGui::TableNextColumn();
                 bool is_selected = (s_selected_index == static_cast<int>(i));
+                // Small avatar before the label. SpanAllColumns keeps the whole row clickable; the avatar
+                // is drawn AFTER the Selectable so its selection/hover fill doesn't paint over it.
+                const float tLineH = ImGui::GetTextLineHeight();
+                const float tAvR = tLineH * 0.5f;
+                const ImVec2 tAvP = ImGui::GetCursorScreenPos();
+                ImGui::Dummy(ImVec2(tAvR * 2.0f, tLineH));
+                ImGui::SameLine(0.0f, 6.0f * dp);
                 if (ImGui::Selectable(entry.label.c_str(), is_selected,
                                       ImGuiSelectableFlags_SpanAllColumns | ImGuiSelectableFlags_AllowDoubleClick)) {
                     if (s_selected_index != static_cast<int>(i)) s_confirm_delete_idx = -1;
@@ -835,8 +867,10 @@ void RenderContactsTab(App* app)
                 if (ImGui::IsItemHovered() && ImGui::IsMouseClicked(ImGuiMouseButton_Right)) {
                     s_selected_index = static_cast<int>(i); s_confirm_delete_idx = -1; openContextMenu = true;
                 }
+                drawContactAvatar(ImGui::GetWindowDrawList(), ImVec2(tAvP.x + tAvR, tAvP.y + tLineH * 0.5f),
+                                  tAvR, entry, shielded, typeColor(shielded), lightTheme, dp,
+                                  material::Type().caption(), material::Type().iconSmall());
                 ImGui::TableNextColumn();
-                bool shielded = isShieldedAddr(entry.address);
                 ImGui::PushFont(material::Type().subtitle2());
                 ImGui::TextColored(ImGui::ColorConvertU32ToFloat4(typeColor(shielded)), "%s", shielded ? "Z" : "T");
                 ImGui::PopFont();