refactor(ui): consolidate dialog footers + shared empty-state, unify buttons/rounding

Addresses the cross-screen inconsistencies from the layout audit by routing screens onto
the design system's own (previously under-used) shared helpers:

- Dialog footers: migrate ~9 overlay dialogs off hand-rolled placement onto the shared
  helpers — DialogActionFooter (primary+Close), DialogConfirmFooter, or
  BeginOverlayDialogFooter for custom/multi-button rows — so footers share one centered
  treatment. All footer/action buttons now use TactileButton (glass press) instead of the
  bare StyledButton some dialogs used.
- Empty states: add a shared material::DrawEmptyState(icon, title, hint) (centered icon +
  title + wrapped hint) and adopt it in Peers, Transactions, and Market-portfolio, which
  previously showed a bare left-aligned caption.
- Security dialogs: add the missing Cancel to Change Passphrase and Set PIN so the whole
  security family shares a two-button footer (Cancel dismisses without applying).
- Transactions pager: shared TactileButton helpers (matching Explorer).
- Frosted-pane rounding: Contacts/Chat use Layout::glassRounding() instead of hardcoded
  12/10/8px literals, matching Peers.
- "Set Label..." title loses its stray trailing ellipsis.

Preserves every button's label and action; the transfer footer's order becomes
[Confirm][Cancel] to match the shared helper's primary-first convention. Verified at 1280
across full-node + Lite + Windows (ctest green) and an adversarial diff review (clean).

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

src/ui/windows/address_transfer_dialog.h

@@ -180,16 +180,14 @@ public:
             const char* sendingLabel = TR("sending");
             ImFont* buttonFont = Type().button();
             float buttonFontSize = ScaledFontSize(buttonFont);
-            float minBtnW = 120.0f * dp;
             float confirmMinW = 160.0f * dp;
             float buttonPadW = ImGui::GetStyle().FramePadding.x * 2.0f + 24.0f * dp;
-            float cancelW = std::max(minBtnW,
-                buttonFont->CalcTextSizeA(buttonFontSize, 1000.0f, 0.0f, cancelLabel).x + buttonPadW);
+            // Both footer buttons share one width (equal-width primary/Close pair), sized to fit the
+            // widest label — the "Sending…" swap label included — so nothing clips.
             float confirmTextW = std::max(
                 buttonFont->CalcTextSizeA(buttonFontSize, 1000.0f, 0.0f, confirmLabel).x,
                 buttonFont->CalcTextSizeA(buttonFontSize, 1000.0f, 0.0f, sendingLabel).x);
-            float confirmW = std::max(confirmMinW, confirmTextW + buttonPadW);
-            float totalW = cancelW + confirmW + Layout::spacingMd();
+            float btnW = std::max(confirmMinW, confirmTextW + buttonPadW);
             float footerH = ImGui::GetFrameHeight() + ImGui::GetStyle().ItemSpacing.y * 3.0f;  // footer divider removed
             ImGuiViewport* vp = ImGui::GetMainViewport();
             float cardBottomY = vp->Pos.y + vp->Size.y * 0.85f;
@@ -201,19 +199,18 @@ public:
                 ImGui::Spacing();
             }
 
-            ImGui::Spacing();
+            // Standardized primary + Close footer (centered, no divider). The primary is the
+            // Confirm/"Sending…" action; the Close button dismisses the dialog.
+            bool outConfirm = false;
+            bool outClose = false;
+            DialogActionFooter(s_sending ? sendingLabel : confirmLabel,
+                               amountValid && !s_sending,
+                               cancelLabel, outConfirm, outClose, btnW);
 
-            float rowStartX = ImGui::GetCursorPosX();
-            float contentW = ImGui::GetContentRegionAvail().x;
-            ImGui::SetCursorPosX(rowStartX + std::max(0.0f, (contentW - totalW) * 0.5f));
-
-            if (TactileButton(cancelLabel, ImVec2(cancelW, 0), buttonFont)) {
+            if (outClose) {
                 s_open = false;
             }
-            ImGui::SameLine(0, Layout::spacingMd());
-
-            ImGui::BeginDisabled(!amountValid || s_sending);
-            if (TactileButton(s_sending ? sendingLabel : confirmLabel, ImVec2(confirmW, 0), buttonFont)) {
+            if (outConfirm) {
                 s_sending = true;
                 s_app->sendTransaction(s_info.fromAddr, s_info.toAddr,
                     amount, s_fee, "",
@@ -231,7 +228,6 @@ public:
                 // state, and when the async callback sets s_resultMsg the in-dialog result screen shows
                 // (with its own Close button). Previously closing here made that result screen dead code.
             }
-            ImGui::EndDisabled();
 
             EndOverlayDialog();
         }