fix(ui): DPI-scale hand-drawn overlays + freeze sweep demo state

Hand-drawn absolute geometry (dl->AddText offsets, SetNextWindowSize,
explicit ImVec2 button widths, SameLine strides) is immune to the app's
DPI machinery (font-atlas rebuild + ScaleAllSizes), so several overlays
rendered native-size (tiny) on HiDPI / Windows 150% displays. Multiply the
raw logical-px geometry by Layout::dpiScale():

- seed_display: content-aware, DPI-scaled seed-grid column stride (a raw
  130px stride let words collide with the next column's index at 150%)
- lock screen: card/logo/input/unlock-button + all vertical offsets
- migrate-to-seed + seed-backup dialogs: button widths
- send-confirm: confirm/cancel button widths
- about dialog: value-column x, edition inset, link/close button widths
- chat conversation list: row height + padding (fixes the preview clip)

Also freeze demo state during the full UI sweep: guard App::update() on
capture_mode_ so a running daemon's refresh can't clobber the injected
demo state (it blanked Send/Receive/History with a CDB error mid-sweep).

Verified on Windows 4K@150% and locally at font_scale=1.5 (same
dpiScale()==1.5 code path). Adds a DPI-scaling convention note to CLAUDE.md.

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

CLAUDE.md

@@ -106,5 +106,6 @@ The version has a **single source of truth**: `project(... VERSION 1.2.0 ...)` p
 - **C++17.** Match the surrounding code's style per file.
 - **Icons:** use the Material Design icon font defines (`ICON_MD_*`); never raw Unicode glyphs.
 - **UI layout values** belong in `res/themes/ui.toml`, read via `schema::UI()` — do not hardcode pixel sizes/offsets in code.
+- **DPI / display scaling:** `schema::UI()` returns **logical (raw) px**; `Layout::dpiScale()` (= OS DPI × the in-app font-scale) is the single scale factor. The `Layout::k*()` helpers and `BeginOverlayDialog` already fold it in, and ImGui auto-layout scales via the DPI-rebuilt font atlas + `ScaleAllSizes` — so tabs/standard widgets scale for free. But **hand-drawn absolute geometry** (`dl->AddText` at manual `cy += 24.0f` offsets, `SetNextWindowSize`, explicit `ImVec2(width,0)` button sizes, `SameLine(x)` column strides) is immune to all of that and must be multiplied by `ui::Layout::dpiScale()` yourself, or it renders native-size (tiny) on a HiDPI display. Font metrics (`font->LegacySize`, `CalcTextSize`) are already scaled — don't double-scale those. Verify at scale with a full sweep run at `font_scale: 1.5` (same `dpiScale()==1.5` code path as OS 150%).
 - **i18n:** user-facing strings are translated via `src/util/i18n`; the English source of truth is the `strings_[...]` map in `src/util/i18n.cpp`, and the per-language translations live as the **source of truth** in `res/lang/` (`de`, `es`, `fr`, `ja`, `ko`, `pt`, `ru`, `zh`). **Edit those JSONs directly and additively** — write with `json.dump(..., indent=4, sort_keys=True, ensure_ascii=False)`; never bulk-regenerate/overwrite a whole file (that path silently dropped ~285 keys/language before). `scripts/add_missing_translations.py` back-fills only the keys missing from a JSON (non-destructive), and `scripts/build_cjk_subset.py` rebuilds the CJK subset font (`res/fonts/NotoSansCJK-Subset.ttf`) after new CJK glyphs are added.
 - **Commits:** the history uses Conventional Commits (`feat(scope): …`, `fix(scope): …`). PRs target `master`.

src/app.cpp

@@ -627,7 +627,13 @@ void App::update()
 {
     PERF_SCOPE("Update.Total");
     ImGuiIO& io = ImGui::GetIO();
-    
+
+    // Full UI screenshot sweep: demo state is injected once and must stay frozen. Skip every live
+    // op (refresh/connect/pumps) so a real daemon can't clobber it — on Windows a running node's
+    // refresh set connected=false (CDB error) and blanked the Send/Receive/History tabs mid-sweep.
+    // capture_mode_ is only set for the offline full sweep, so the live tab-only sweep is unaffected.
+    if (capture_mode_) return;
+
     // Track user interaction for auto-lock
     if (io.MouseDelta.x != 0 || io.MouseDelta.y != 0 ||
         io.MouseClicked[0] || io.MouseClicked[1] ||
@@ -3006,6 +3012,9 @@ void App::renderSeedBackupDialog()
 
     ui::material::Type().text(ui::material::TypeStyle::H6, TR("seed_backup_title"));
     ImGui::Dummy(ImVec2(0, ui::Layout::spacingSm()));
+    // Button widths are logical px; BeginOverlayDialog scales the card by dpiScale() so scale these
+    // to match (raw widths render small/left-packed at higher DPI / font scale).
+    const float dp = ui::Layout::dpiScale();
 
     if (state_.isLocked()) {
         ImGui::TextWrapped("%s", TR("seed_backup_locked"));
@@ -3027,11 +3036,11 @@ void App::renderSeedBackupDialog()
             ImGui::Spacing();
         }
         ImGui::Separator();
-        if (ui::material::StyledButton(TR("seed_backup_copy"), ImVec2(120, 0))) {
+        if (ui::material::StyledButton(TR("seed_backup_copy"), ImVec2(120 * dp, 0))) {
             copySecretToClipboard(seed_backup_phrase_);
         }
         ImGui::SameLine();
-        if (ui::material::StyledButton(TR("seed_backup_save"), ImVec2(150, 0))) {
+        if (ui::material::StyledButton(TR("seed_backup_save"), ImVec2(150 * dp, 0))) {
             std::string path = util::Platform::getConfigDir() + "/dragonx-seed-backup.txt";
             std::string content = seed_backup_phrase_ + "\n";
             const bool ok = util::Platform::writeFileAtomically(path, content,
@@ -3041,7 +3050,7 @@ void App::renderSeedBackupDialog()
                                       : std::string(TR("seed_backup_save_failed"))) + path;
         }
         ImGui::SameLine();
-        if (ui::material::StyledButton(TR("seed_backup_close"), ImVec2(120, 0))) {
+        if (ui::material::StyledButton(TR("seed_backup_close"), ImVec2(120 * dp, 0))) {
             closeAndWipe();
             ui::material::EndOverlayDialog();
             return;
@@ -3054,7 +3063,7 @@ void App::renderSeedBackupDialog()
 
     ImGui::Spacing();
     ImGui::Separator();
-    if (ui::material::StyledButton(TR("seed_backup_close"), ImVec2(120, 0))) {
+    if (ui::material::StyledButton(TR("seed_backup_close"), ImVec2(120 * dp, 0))) {
         closeAndWipe();
     }
     ui::material::EndOverlayDialog();
@@ -3085,6 +3094,9 @@ void App::renderSeedMigrationDialog()
     if (!show_seed_migration_ && busy) show_seed_migration_ = true;
 
     const ImVec4 kMedium = ImGui::ColorConvertU32ToFloat4(ui::material::OnSurfaceMedium());
+    // BeginOverlayDialog scales the card by dpiScale(); the button widths below are authored in
+    // logical px and must be scaled the same way or they render small/left-packed at higher DPI.
+    const float dp = ui::Layout::dpiScale();
     ui::material::Type().text(ui::material::TypeStyle::H6, TR("mig_title"));
     ImGui::Dummy(ImVec2(0, ui::Layout::spacingSm()));
 
@@ -3093,10 +3105,10 @@ void App::renderSeedMigrationDialog()
         ImGui::TextWrapped("%s", TR("mig_intro"));
         ImGui::Spacing();
         ImGui::Separator();
-        if (ui::material::StyledButton(TR("mig_create"), ImVec2(180, 0)))
+        if (ui::material::StyledButton(TR("mig_create"), ImVec2(180 * dp, 0)))
             beginCreateSeedWallet();
         ImGui::SameLine();
-        if (ui::material::StyledButton(TR("cancel"), ImVec2(120, 0)))
+        if (ui::material::StyledButton(TR("cancel"), ImVec2(120 * dp, 0)))
             close();
         break;
 
@@ -3117,10 +3129,10 @@ void App::renderSeedMigrationDialog()
         ImGui::TextColored(kMedium, "%s", TR("mig_receive_addr"));
         ImGui::TextWrapped("%s", seed_migration_dest_.c_str());
         ImGui::Spacing();
-        if (ui::material::StyledButton(TR("mig_copy_seed"), ImVec2(120, 0)))
+        if (ui::material::StyledButton(TR("mig_copy_seed"), ImVec2(120 * dp, 0)))
             copySecretToClipboard(seed_migration_seed_);
         ImGui::SameLine();
-        if (ui::material::StyledButton(TR("seed_backup_save"), ImVec2(130, 0))) {
+        if (ui::material::StyledButton(TR("seed_backup_save"), ImVec2(130 * dp, 0))) {
             std::string path = util::Platform::getConfigDir() + "/dragonx-seed-wallet-backup.txt";
             std::string content = seed_migration_seed_ + "\nAddress: " + seed_migration_dest_ + "\n";
             const bool ok = util::Platform::writeFileAtomically(path, content, /*restrict=*/true);
@@ -3138,14 +3150,14 @@ void App::renderSeedMigrationDialog()
         ImGui::PopStyleColor();
         ImGui::Separator();
         if (!seed_migration_backed_up_) ImGui::BeginDisabled();
-        if (ui::material::StyledButton(TR("mig_continue_sweep"), ImVec2(170, 0))) {
+        if (ui::material::StyledButton(TR("mig_continue_sweep"), ImVec2(170 * dp, 0))) {
             wipeSeed();  // the sweep/adopt steps only use the address, never the seed itself
             seed_migration_step_ = SeedMigrationStep::Sweep;
             refreshSeedMigrationBalance();
         }
         if (!seed_migration_backed_up_) ImGui::EndDisabled();
         ImGui::SameLine();
-        if (ui::material::StyledButton(TR("mig_discard"), ImVec2(160, 0))) {
+        if (ui::material::StyledButton(TR("mig_discard"), ImVec2(160 * dp, 0))) {
             // Throw away the isolated new wallet + clear the pending state.
             if (!seed_migration_temp_dir_.empty()) {
                 std::error_code ec;
@@ -3181,15 +3193,15 @@ void App::renderSeedMigrationDialog()
         {
             const bool canSweep = !state_.isLocked() && seed_migration_balance_ > 0.0;
             if (!canSweep) ImGui::BeginDisabled();
-            if (ui::material::StyledButton(TR("mig_sweep_all"), ImVec2(170, 0)))
+            if (ui::material::StyledButton(TR("mig_sweep_all"), ImVec2(170 * dp, 0)))
                 beginSweepToSeedWallet();
             if (!canSweep) ImGui::EndDisabled();
         }
         ImGui::SameLine();
-        if (ui::material::StyledButton(TR("refresh"), ImVec2(110, 0)))
+        if (ui::material::StyledButton(TR("refresh"), ImVec2(110 * dp, 0)))
             refreshSeedMigrationBalance();
         ImGui::SameLine();
-        if (ui::material::StyledButton(TR("mig_later"), ImVec2(100, 0)))
+        if (ui::material::StyledButton(TR("mig_later"), ImVec2(100 * dp, 0)))
             close();  // pending state persists; resumes here next time
         break;
     }
@@ -3219,22 +3231,22 @@ void App::renderSeedMigrationDialog()
         ImGui::Spacing();
         ImGui::Separator();
         if (confirmed && legacyEmpty) {
-            if (ui::material::StyledButton(TR("mig_adopt"), ImVec2(180, 0)))
+            if (ui::material::StyledButton(TR("mig_adopt"), ImVec2(180 * dp, 0)))
                 beginAdoptSeedWallet();
         } else if (confirmed && !legacyEmpty) {
             ImGui::PushStyleColor(ImGuiCol_Text, ui::material::Error());
             ImGui::TextWrapped("%s", TR("mig_remainder"));
             ImGui::PopStyleColor();
-            if (ui::material::StyledButton(TR("mig_sweep_remaining"), ImVec2(180, 0)))
+            if (ui::material::StyledButton(TR("mig_sweep_remaining"), ImVec2(180 * dp, 0)))
                 beginSweepToSeedWallet();
         } else {
             ImGui::TextColored(kMedium, "%s", TR("mig_waiting_mine"));
         }
         ImGui::SameLine();
-        if (ui::material::StyledButton(TR("refresh"), ImVec2(110, 0)))
+        if (ui::material::StyledButton(TR("refresh"), ImVec2(110 * dp, 0)))
             pollSweepStatus();
         ImGui::SameLine();
-        if (ui::material::StyledButton(TR("mig_later"), ImVec2(100, 0)))
+        if (ui::material::StyledButton(TR("mig_later"), ImVec2(100 * dp, 0)))
             close();  // pending state + txid persist; resumes here next time
         break;
     }
@@ -3260,7 +3272,7 @@ void App::renderSeedMigrationDialog()
         }
         ImGui::Spacing();
         ImGui::Separator();
-        if (ui::material::StyledButton(TR("mig_done_btn"), ImVec2(120, 0)))
+        if (ui::material::StyledButton(TR("mig_done_btn"), ImVec2(120 * dp, 0)))
             close();
         break;
 
@@ -3270,7 +3282,7 @@ void App::renderSeedMigrationDialog()
         ImGui::PopStyleColor();
         ImGui::Spacing();
         ImGui::Separator();
-        if (ui::material::StyledButton(TR("close"), ImVec2(120, 0)))
+        if (ui::material::StyledButton(TR("close"), ImVec2(120 * dp, 0)))
             close();
         break;
     }

src/app_security.cpp

@@ -824,12 +824,19 @@ void App::renderLockScreen() {
         MarkBlurOverlayDrawn(nullptr);  // suppress foreground theme-effect bleed + re-capture on unlock
     }
 
-    // Card
+    // Card. The lock screen is fully hand-drawn (dl->AddText at manual y offsets), so — unlike
+    // BeginOverlayDialog cards — nothing scales automatically. Multiply every geometry literal
+    // (card size, logo, input/button widths, vertical gaps) by dpiScale() so the card grows with
+    // OS DPI / font scale instead of stranding a native-size card in a large window. The font
+    // metrics (LegacySize / CalcTextSize) are already DPI-scaled via the atlas, so leave those.
+    const float dp = ui::Layout::dpiScale();
     const auto& S = ui::schema::UI();
     float cardW = S.drawElement("screens.lock-screen", "card").getFloat("width", 400.0f);
     float cardH = S.drawElement("screens.lock-screen", "card").height;
     if (cardW <= 0) cardW = 400.0f;
     if (cardH <= 0) cardH = 320.0f;
+    cardW *= dp;
+    cardH *= dp;
 
     float cardX = winPos.x + (winSize.x - cardW) * 0.5f;
     float cardY = winPos.y + (winSize.y - cardH) * 0.5f;
@@ -845,17 +852,17 @@ void App::renderLockScreen() {
     cardGlass.borderWidth = 1.0f;
     DrawGlassPanel(dl, cardMin, cardMax, cardGlass);
 
-    float cy = cardY + 24.0f;
+    float cy = cardY + 24.0f * dp;
 
     // Logo
-    float logoSize = S.drawElement("screens.lock-screen", "logo").sizeOr(64.0f);
+    float logoSize = S.drawElement("screens.lock-screen", "logo").sizeOr(64.0f) * dp;
     if (logo_tex_ != 0) {
         float aspect = (logo_h_ > 0) ? (float)logo_w_ / (float)logo_h_ : 1.0f;
         float logoW = logoSize * aspect;
         float logoX = cardX + (cardW - logoW) * 0.5f;
         dl->AddImage(logo_tex_, ImVec2(logoX, cy), ImVec2(logoX + logoW, cy + logoSize));
     }
-    cy += logoSize + 16.0f;
+    cy += logoSize + 16.0f * dp;
 
     // Title
     ImFont* titleFont = S.resolveFont(S.label("screens.lock-screen", "title").font);
@@ -869,7 +876,7 @@ void App::renderLockScreen() {
         ImVec2 ts = titleFont->CalcTextSizeA(titleFont->LegacySize, FLT_MAX, 0, title);
         dl->AddText(titleFont, titleFont->LegacySize,
                     ImVec2(cardX + (cardW - ts.x) * 0.5f, cy), textCol, title);
-        cy += ts.y + 20.0f;
+        cy += ts.y + 20.0f * dp;
     }
 
     // Lockout timer
@@ -882,7 +889,7 @@ void App::renderLockScreen() {
         ImVec2 ms = captionFont->CalcTextSizeA(captionFont->LegacySize, FLT_MAX, 0, msg);
         dl->AddText(captionFont, captionFont->LegacySize,
                     ImVec2(cardX + (cardW - ms.x) * 0.5f, cy), ui::material::Warning(), msg);
-        cy += captionFont->LegacySize + 12.0f;
+        cy += captionFont->LegacySize + 12.0f * dp;
     }
 
     // Check if PIN vault is available
@@ -907,7 +914,7 @@ void App::renderLockScreen() {
                     ImVec2(startX, cy), IM_COL32(255,255,255,120), modeIcon);
         dl->AddText(captionFont, captionFont->LegacySize,
                     ImVec2(startX + iconSize.x, textY), IM_COL32(255,255,255,120), modeText);
-        cy += std::max(iconSize.y, textSize.y) + 8.0f;
+        cy += std::max(iconSize.y, textSize.y) + 8.0f * dp;
 
         // Switch link
         ImVec2 sls = captionFont->CalcTextSizeA(captionFont->LegacySize, FLT_MAX, 0, switchLabel);
@@ -924,7 +931,7 @@ void App::renderLockScreen() {
         dl->AddText(captionFont, captionFont->LegacySize,
                     ImVec2(switchX, cy), ui::material::Primary(), switchLabel);
         ImGui::PopStyleColor();
-        cy += captionFont->LegacySize + 12.0f;
+        cy += captionFont->LegacySize + 12.0f * dp;
     } else {
         // No PIN vault — don't show toggle, force passphrase mode
         lock_use_pin_ = false;
@@ -933,6 +940,7 @@ void App::renderLockScreen() {
     // Input field
     float inputW = S.drawElement("screens.lock-screen", "input").getFloat("width", 320.0f);
     if (inputW <= 0) inputW = 320.0f;
+    inputW *= dp;
     float inputX = cardX + (cardW - inputW) * 0.5f;
 
     bool canSubmit = lock_lockout_timer_ <= 0.0f && !lock_unlock_in_progress_;
@@ -942,7 +950,7 @@ void App::renderLockScreen() {
         // PIN input
         ImGui::SetCursorScreenPos(ImVec2(inputX, cy));
         ImGui::PushItemWidth(inputW);
-        ImGui::PushStyleVar(ImGuiStyleVar_FrameRounding, 6.0f);
+        ImGui::PushStyleVar(ImGuiStyleVar_FrameRounding, 6.0f * dp);
         ImGuiInputTextFlags pinFlags = ImGuiInputTextFlags_Password | ImGuiInputTextFlags_CharsDecimal;
         if (canSubmit) pinFlags |= ImGuiInputTextFlags_EnterReturnsTrue;
         submitted = ImGui::InputText("##lock_pin", lock_pin_buf_,
@@ -953,7 +961,7 @@ void App::renderLockScreen() {
         // Passphrase input (original)
         ImGui::SetCursorScreenPos(ImVec2(inputX, cy));
         ImGui::PushItemWidth(inputW);
-        ImGui::PushStyleVar(ImGuiStyleVar_FrameRounding, 6.0f);
+        ImGui::PushStyleVar(ImGuiStyleVar_FrameRounding, 6.0f * dp);
         ImGuiInputTextFlags inputFlags = ImGuiInputTextFlags_Password;
         if (canSubmit) inputFlags |= ImGuiInputTextFlags_EnterReturnsTrue;
         submitted = ImGui::InputText("##lock_pass", lock_passphrase_buf_,
@@ -965,9 +973,9 @@ void App::renderLockScreen() {
     // default frame is subtle on the glass card, so this shows the field is active and ready to type.
     if (ImGui::IsItemActive() || ImGui::IsItemFocused()) {
         dl->AddRect(ImGui::GetItemRectMin(), ImGui::GetItemRectMax(),
-                    ui::material::Primary(), 6.0f, 0, 2.0f);
+                    ui::material::Primary(), 6.0f * dp, 0, 2.0f * dp);
     }
-    cy += 40.0f + 12.0f;
+    cy += (40.0f + 12.0f) * dp;
 
     // Focus the input when the lock screen first appears.
     // IsWindowAppearing() does not work here because the lock screen is
@@ -985,13 +993,13 @@ void App::renderLockScreen() {
         dl->AddText(captionFont, captionFont->LegacySize,
                     ImVec2(cardX + (cardW - es.x) * 0.5f, cy), ui::material::Error(),
                     lock_error_msg_.c_str());
-        cy += captionFont->LegacySize + 8.0f;
+        cy += captionFont->LegacySize + 8.0f * dp;
     }
 
     // "Unlocking..." feedback while worker thread is running
     // Always reserve the vertical space so the button doesn't shift.
     {
-        float rowH = captionFont->LegacySize + 8.0f;
+        float rowH = captionFont->LegacySize + 8.0f * dp;
         if (lock_unlock_in_progress_) {
             // Animated spinner dots
             char msg[64];
@@ -1009,13 +1017,15 @@ void App::renderLockScreen() {
     float unlockH = S.drawElement("screens.lock-screen", "unlock-button").height;
     if (unlockW <= 0) unlockW = 320.0f;
     if (unlockH <= 0) unlockH = 44.0f;
+    unlockW *= dp;
+    unlockH *= dp;
     float unlockX = cardX + (cardW - unlockW) * 0.5f;
 
     ImGui::SetCursorScreenPos(ImVec2(unlockX, cy));
     ImGui::PushStyleColor(ImGuiCol_Button, ImGui::ColorConvertU32ToFloat4(ui::material::Primary()));
     ImGui::PushStyleColor(ImGuiCol_ButtonHovered, ImGui::ColorConvertU32ToFloat4(ui::material::PrimaryVariant()));
     ImGui::PushStyleColor(ImGuiCol_Text, ImGui::ColorConvertU32ToFloat4(ui::material::OnPrimary()));
-    ImGui::PushStyleVar(ImGuiStyleVar_FrameRounding, 8.0f);
+    ImGui::PushStyleVar(ImGuiStyleVar_FrameRounding, 8.0f * dp);
     ImGui::BeginDisabled(!canSubmit);
     bool btnClicked = ui::material::TactileButton("Unlock", ImVec2(unlockW, unlockH));
     ImGui::EndDisabled();

src/ui/windows/about_dialog.cpp

@@ -24,7 +24,16 @@ void RenderAboutDialog(App* app, bool* p_open)
     auto closeBtn = S.button("dialogs.about", "close-button");
     auto versionLbl = S.label("dialogs.about", "version-label");
     auto editionLbl = S.label("dialogs.about", "edition-label");
-    
+
+    // Schema positions/widths are logical px. BeginOverlayDialog scales the card by dpiScale(), so
+    // scale the value-column x, the edition inset, and the button widths to match — raw values left
+    // the value column jammed against the labels and the buttons left-packed at higher DPI.
+    const float dp = Layout::dpiScale();
+    const float valX   = versionLbl.position * dp;
+    const float edX    = editionLbl.position * dp;
+    const float linkW  = linkBtn.width * dp;
+    const float closeW = closeBtn.width * dp;
+
     if (!material::BeginOverlayDialog(TR("about_title"), p_open, win.width, 0.94f)) {
         return;
     }
@@ -39,7 +48,7 @@ void RenderAboutDialog(App* app, bool* p_open)
     ImGui::PopFont();
     ImGui::PopStyleColor();
     
-    ImGui::SameLine(ImGui::GetWindowWidth() - editionLbl.position);
+    ImGui::SameLine(ImGui::GetWindowWidth() - edX);
     ImGui::TextDisabled("%s", TR("about_edition"));
     
     ImGui::Spacing();
@@ -48,24 +57,24 @@ void RenderAboutDialog(App* app, bool* p_open)
     
     // Version info
     ImGui::Text("%s", TR("about_version"));
-    ImGui::SameLine(versionLbl.position);
+    ImGui::SameLine(valX);
     ImGui::Text("%s", DRAGONX_VERSION);
     
     ImGui::Text("%s", TR("about_imgui"));
-    ImGui::SameLine(versionLbl.position);
+    ImGui::SameLine(valX);
     ImGui::Text("%s", IMGUI_VERSION);
     
     ImGui::Text("%s", TR("about_build_date"));
-    ImGui::SameLine(versionLbl.position);
+    ImGui::SameLine(valX);
     ImGui::Text("%s %s", __DATE__, __TIME__);
     
 #ifdef DRAGONX_DEBUG
     ImGui::Text("%s", TR("about_build_type"));
-    ImGui::SameLine(versionLbl.position);
+    ImGui::SameLine(valX);
     ImGui::TextColored(ImVec4(1.0f, 0.6f, 0.0f, 1.0f), "%s", TR("about_debug"));
 #else
     ImGui::Text("%s", TR("about_build_type"));
-    ImGui::SameLine(versionLbl.position);
+    ImGui::SameLine(valX);
     ImGui::Text("%s", TR("about_release"));
 #endif
 
@@ -76,20 +85,20 @@ void RenderAboutDialog(App* app, bool* p_open)
         ImGui::Spacing();
         
         ImGui::Text("%s", TR("about_daemon"));
-        ImGui::SameLine(versionLbl.position);
+        ImGui::SameLine(valX);
         ImGui::TextColored(ImVec4(0.3f, 0.8f, 0.3f, 1.0f), "%s", TR("connected"));
         
         const auto& state = app->getWalletState();
         ImGui::Text("%s", TR("about_chain"));
-        ImGui::SameLine(versionLbl.position);
+        ImGui::SameLine(valX);
         ImGui::Text("ObsidianDragon");
         
         ImGui::Text("%s", TR("about_block_height"));
-        ImGui::SameLine(versionLbl.position);
+        ImGui::SameLine(valX);
         ImGui::Text("%d", state.sync.blocks);
         
         ImGui::Text("%s", TR("about_connections"));
-        ImGui::SameLine(versionLbl.position);
+        ImGui::SameLine(valX);
         ImGui::Text(TR("about_peers_count"), state.peers.size());
     }
     
@@ -121,22 +130,22 @@ void RenderAboutDialog(App* app, bool* p_open)
     ImGui::Spacing();
     
     // Links
-    if (material::StyledButton(TR("about_website"), ImVec2(linkBtn.width, 0), S.resolveFont(linkBtn.font))) {
+    if (material::StyledButton(TR("about_website"), ImVec2(linkW, 0), S.resolveFont(linkBtn.font))) {
         util::Platform::openUrl("https://dragonx.is");
     }
     ImGui::SameLine();
-    if (material::StyledButton(TR("about_github"), ImVec2(linkBtn.width, 0), S.resolveFont(linkBtn.font))) {
+    if (material::StyledButton(TR("about_github"), ImVec2(linkW, 0), S.resolveFont(linkBtn.font))) {
         util::Platform::openUrl("https://git.dragonx.is/dragonx/ObsidianDragon");
     }
     ImGui::SameLine();
-    if (material::StyledButton(TR("about_block_explorer"), ImVec2(linkBtn.width, 0), S.resolveFont(linkBtn.font))) {
+    if (material::StyledButton(TR("about_block_explorer"), ImVec2(linkW, 0), S.resolveFont(linkBtn.font))) {
         util::Platform::openUrl("https://explorer.dragonx.is");
     }
     
     ImGui::Spacing();
     
     // Close button
-    float button_width = closeBtn.width;
+    float button_width = closeW;
     ImGui::SetCursorPosX((ImGui::GetWindowWidth() - button_width) * 0.5f);
     if (material::StyledButton(TR("close"), ImVec2(button_width, 0), S.resolveFont(closeBtn.font))) {
         *p_open = false;

src/ui/windows/chat_tab.cpp

@@ -12,6 +12,7 @@
 #include "../../util/i18n.h"
 #include "../material/colors.h"
 #include "../material/type.h"
+#include "../layout.h"   // Layout::dpiScale()
 #include "imgui.h"
 
 #include <algorithm>
@@ -134,8 +135,11 @@ void RenderChatTab(App* app)
 
     const ImVec2 avail = ImGui::GetContentRegionAvail();
     const float listW = std::clamp(avail.x * 0.32f, 220.0f, 360.0f);
-    const float pad = 10.0f;
+    // Row geometry is logical px — scale by dpiScale() so rows/padding grow with the (DPI-scaled)
-    const float rowH = 52.0f;
+    // fonts. Left raw, at higher DPI the row was too short for the enlarged text and the preview's
+    // right margin (rowW - pad) shrank to ~zero, clipping the last glyph mid-word.
+    const float pad = 10.0f * Layout::dpiScale();
+    const float rowH = 52.0f * Layout::dpiScale();
 
     ImFont* nameFont = material::Type().body2();
     ImFont* metaFont = material::Type().caption();

src/ui/windows/seed_display.h

@@ -10,6 +10,7 @@
 #include <vector>
 
 #include "imgui.h"
+#include "../layout.h"   // Layout::dpiScale()
 
 namespace dragonx {
 namespace ui {
@@ -31,14 +32,26 @@ inline std::vector<std::string> SplitSeedWords(const std::string& phrase)
 }
 
 // Render the words as a numbered 4-column grid (matches the lite welcome wizard layout).
+// The column stride is sized to the widest "NN. word" cell and scaled by dpiScale(): a raw px
+// stride collided with the next column's index once the font grew at higher DPI / font scale
+// (e.g. at 150% "13. elevator" ran straight into "14."). Sizing to content keeps a gap at any
+// scale and for any word length.
 inline void RenderSeedWordGrid(const std::vector<std::string>& words, float colSpacingPx = 130.0f)
 {
+    const float dp = Layout::dpiScale();
+    float colStride = colSpacingPx * dp;
+    for (size_t i = 0; i < words.size(); ++i) {
+        char cell[96];
+        std::snprintf(cell, sizeof(cell), "%2zu. %s", i + 1, words[i].c_str());
+        const float need = ImGui::CalcTextSize(cell).x + 20.0f * dp;  // cell width + inter-column gap
+        if (need > colStride) colStride = need;
+    }
     for (size_t i = 0; i < words.size(); ++i) {
         char cell[96];
         std::snprintf(cell, sizeof(cell), "%2zu. %s", i + 1, words[i].c_str());
         ImGui::TextUnformatted(cell);
         if ((i % 4) != 3 && i + 1 < words.size())
-            ImGui::SameLine(((i % 4) + 1) * colSpacingPx);
+            ImGui::SameLine(((i % 4) + 1) * colStride);
     }
 }
 

src/ui/windows/send_tab.cpp

@@ -821,7 +821,7 @@ void RenderSendConfirmPopup(App* app) {
         if (s_sending) {
             Type().text(TypeStyle::Body2, TR("sending"));
         } else {
-            if (TactileButton(TR("confirm_and_send"), ImVec2(S.button("tabs.send", "confirm-button").width, std::max(schema::UI().drawElement("tabs.send", "confirm-btn-min-height").size, schema::UI().drawElement("tabs.send", "confirm-btn-base-height").size * popVs)), S.resolveFont(S.button("tabs.send", "confirm-button").font))) {
+            if (TactileButton(TR("confirm_and_send"), ImVec2(S.button("tabs.send", "confirm-button").width * Layout::dpiScale(), std::max(schema::UI().drawElement("tabs.send", "confirm-btn-min-height").size, schema::UI().drawElement("tabs.send", "confirm-btn-base-height").size * popVs)), S.resolveFont(S.button("tabs.send", "confirm-button").font))) {
               // Re-validate against LIVE state — the confirm dialog persists across frames, so the
               // balance could have dropped or sync (re)started (or the fee bumped total over available)
               // since Review. Don't broadcast a now-invalid transaction.
@@ -874,7 +874,7 @@ void RenderSendConfirmPopup(App* app) {
               }
             }
             ImGui::SameLine();
-            if (TactileButton(TR("cancel"), ImVec2(S.button("tabs.send", "cancel-button").width, std::max(schema::UI().drawElement("tabs.send", "confirm-btn-min-height").size, schema::UI().drawElement("tabs.send", "confirm-btn-base-height").size * popVs)), S.resolveFont(S.button("tabs.send", "cancel-button").font))) {
+            if (TactileButton(TR("cancel"), ImVec2(S.button("tabs.send", "cancel-button").width * Layout::dpiScale(), std::max(schema::UI().drawElement("tabs.send", "confirm-btn-min-height").size, schema::UI().drawElement("tabs.send", "confirm-btn-base-height").size * popVs)), S.resolveFont(S.button("tabs.send", "cancel-button").font))) {
                 s_show_confirm = false;
             }
         }