feat(ui): implement UI/UX audit — i18n, HiDPI, theme, destructive-action & overflow fixes

Implements all 26 confirmed UI/UX audit findings plus the 4 dashboard/timeline
tile labels. Verified across full-node + Lite + Windows builds (ctest green) and
an adversarial diff review (one market-tab delete regression caught + fixed).

i18n coverage:
- Balance hero/quick-actions/toasts + dashboard & timeline tiles (Total Balance,
  Shielded, Transparent, Quick Send, Quick Receive, Click to open, Market)
- Send: Review Send / Cancel / Paste / view-only tooltip / memo byte counter
- Settings: Lite lifecycle errors, plaintext-RPC security warning, 8 toasts
- Mining pool-payout tooltip
- Resolve daemon_update_title double-assignment collision (new daemon_update_prompt_title)
- 23 new keys translated into all 8 locales; CJK subset font rebuilt

HiDPI: DPI-scale the Send amount bar, mining thread-tile clamp bounds, receive
loading skeleton, and sidebar notification-badge insets.

Light theme: theme-aware material::SurfaceOverlay() for balance bar tracks and
row-hover highlights; contacts active-pill foreground uses OnPrimary().

Destructive actions: arm/confirm for portfolio-group delete, saved pool/worker
remove, and avatar-image delete.

Interaction/overflow: route balance star/eye buttons and the console fold-toggle
through popup-safe guards; clip peer addr/subver; truncate the balance custom
label; measure Settings tool-button widths; mining stepper disabled-state
feedback; +/- stepper buttons restyled to match the thread tiles.

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

src/ui/windows/market_tab.cpp

@@ -137,6 +137,12 @@ struct PfEditState {
 };
 static PfEditState s_pfEdit;
 
+// Two-stage delete arm/confirm for the master-list per-row delete icon (mirrors the
+// contacts tab's s_confirm_delete_idx): first click on a row's trash arms it (icon turns
+// red); a second click on the SAME row within the loop confirms the erase. Hovering/clicking
+// a different row, or clicking off the icons, disarms. -1 = nothing armed.
+static int s_pfConfirmDelIdx = -1;
+
 // The pure price-series math lives in data/market_series.h; the selected chart range is
 // s_mkt.chartInterval (0=Live 1=1H 2=1D 3=1W 4=1M, session-scoped, default 1M).
 
@@ -837,6 +843,7 @@ static void RenderPortfolioEditor(App* app)
             float rowH = 46.0f * dp;
             float delSlot = 36.0f * dp;   // reserved trailing space for the delete icon + margin
             int clickedSel = -999, delRow = -1;  // deferred: don't mutate `entries` mid-loop
+            bool armedThisFrame = false;         // an arm-click also fires the row Selectable; don't let it disarm
             for (int vi = 0; vi < (int)vis.size(); vi++) {
                 int i = vis[vi];
                 ImGui::PushID(i);
@@ -877,6 +884,7 @@ static void RenderPortfolioEditor(App* app)
                 // Per-row delete icon (larger, inset from the edge). Hit-tested manually so it is
                 // NOT an overlapping ImGui item over the row Selectable (which asserted on hover).
                 if (rowHov || selRow) {
+                    bool armed = (s_pfConfirmDelIdx == i);   // this row is arm-confirmed
                     ImFont* delFont = Type().iconMed();
                     float ds = delFont->LegacySize;
                     ImVec2 dc(rmx.x - Layout::spacingMd() - ds * 0.5f, rmn.y + rowH * 0.5f);
@@ -884,11 +892,20 @@ static void RenderPortfolioEditor(App* app)
                     bool dhov = ImGui::IsMouseHoveringRect(dmn, dmx);
                     if (dhov) {
                         ImGui::SetMouseCursor(ImGuiMouseCursor_Hand);
-                        if (ImGui::IsMouseClicked(ImGuiMouseButton_Left)) delRow = i;
+                        // Hovering a *different* row's trash disarms the previously armed one.
+                        if (!armed && s_pfConfirmDelIdx >= 0) s_pfConfirmDelIdx = -1;
+                        if (ImGui::IsMouseClicked(ImGuiMouseButton_Left)) {
+                            if (armed) delRow = i;               // 2nd click on the armed row erases
+                            else { s_pfConfirmDelIdx = i;        // 1st click arms this row...
+                                   armedThisFrame = true; }      // ...and must survive the row-select this same click triggers
+                        }
                     }
-                    ImVec2 isz = delFont->CalcTextSizeA(ds, FLT_MAX, 0, ICON_MD_DELETE_OUTLINE);
+                    // A filled trash glyph while armed (vs outline) reinforces the recolor.
+                    const char* delGlyph = armed ? ICON_MD_DELETE : ICON_MD_DELETE_OUTLINE;
+                    ImU32 delCol = armed ? ReadableError() : (dhov ? Error() : OnSurfaceMedium());
+                    ImVec2 isz = delFont->CalcTextSizeA(ds, FLT_MAX, 0, delGlyph);
                     mdl->AddText(delFont, ds, ImVec2(dc.x - isz.x * 0.5f, dc.y - isz.y * 0.5f),
-                                 dhov ? Error() : OnSurfaceMedium(), ICON_MD_DELETE_OUTLINE);
+                                 delCol, delGlyph);
                 }
                 ImGui::PopID();
             }
@@ -905,10 +922,16 @@ static void RenderPortfolioEditor(App* app)
                     else if (delRow == s_pfEdit.sel) s_pfEdit.sel = std::min(delRow, (int)es.size() - 1);
                     PortfolioBeginEdit(app, s_pfEdit.sel);
                 }
-            } else if (clickedSel != -999) {
+                s_pfConfirmDelIdx = -1;   // erase done — storage indices shifted, drop the arm
+            } else if (clickedSel != -999 && !armedThisFrame) {
                 pfCommitIfNeeded(app);                // auto-save the current group before switching
                 PortfolioBeginEdit(app, clickedSel);
+                s_pfConfirmDelIdx = -1;   // switching rows disarms any pending delete
             }
+            // A left-click that hit no row/action (empty list space) disarms a pending delete.
+            if (ImGui::IsWindowHovered() && ImGui::IsMouseClicked(ImGuiMouseButton_Left) &&
+                !ImGui::IsAnyItemHovered())
+                s_pfConfirmDelIdx = -1;
         }
         ImGui::EndChild();
         ImGui::Dummy(ImVec2(0, Layout::spacingSm()));