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>

res/lang/de.json

@@ -1312,7 +1312,7 @@
     "sent_filter": "Gesendet",
     "sent_type": "Gesendet",
     "sent_upper": "GESENDET",
-    "set_label": "Label setzen...",
+    "set_label": "Label setzen",
     "settings": "Einstellungen",
     "settings_about_text": "Eine geschirmte Kryptowährungs-Wallet für DragonX (DRGX), erstellt mit Dear ImGui für ein leichtes, portables Erlebnis.",
     "settings_acrylic_level": "Acrylstufe:",

res/lang/es.json

@@ -1312,7 +1312,7 @@
     "sent_filter": "Enviado",
     "sent_type": "Enviado",
     "sent_upper": "ENVIADO",
-    "set_label": "Establecer Etiqueta...",
+    "set_label": "Establecer Etiqueta",
     "settings": "Ajustes",
     "settings_about_text": "Una billetera de criptomonedas blindada para DragonX (DRGX), creada con Dear ImGui para una experiencia ligera y portátil.",
     "settings_acrylic_level": "Nivel de acrílico:",

res/lang/fr.json

@@ -1312,7 +1312,7 @@
     "sent_filter": "Envoyé",
     "sent_type": "Envoyé",
     "sent_upper": "ENVOYÉ",
-    "set_label": "Définir le libellé...",
+    "set_label": "Définir le libellé",
     "settings": "Paramètres",
     "settings_about_text": "Un portefeuille de cryptomonnaie blindé pour DragonX (DRGX), construit avec Dear ImGui pour une expérience légère et portable.",
     "settings_acrylic_level": "Niveau acrylique :",

res/lang/ja.json

@@ -1309,7 +1309,7 @@
     "sent_filter": "送信済み",
     "sent_type": "送信済み",
     "sent_upper": "送信済み",
-    "set_label": "ラベルを設定...",
+    "set_label": "ラベルを設定",
     "settings": "設定",
     "settings_about_text": "DragonX (DRGX) 用のシールド暗号通貨ウォレット。Dear ImGui で構築された軽量でポータブルな体験。",
     "settings_acrylic_level": "アクリルレベル：",

res/lang/ko.json

@@ -1311,7 +1311,7 @@
     "sent_filter": "전송됨",
     "sent_type": "전송됨",
     "sent_upper": "전송됨",
-    "set_label": "라벨 설정...",
+    "set_label": "라벨 설정",
     "settings": "설정",
     "settings_about_text": "DragonX (DRGX)용 차폐 암호화폐 지갑으로, Dear ImGui로 제작되어 가볍고 휴대 가능합니다.",
     "settings_acrylic_level": "아크릴 레벨:",

res/lang/pt.json

@@ -1312,7 +1312,7 @@
     "sent_filter": "Enviado",
     "sent_type": "Enviado",
     "sent_upper": "ENVIADO",
-    "set_label": "Definir Rótulo...",
+    "set_label": "Definir Rótulo",
     "settings": "Ajustes",
     "settings_about_text": "Uma carteira de criptomoeda blindada para DragonX (DRGX), criada com Dear ImGui para uma experiência leve e portátil.",
     "settings_acrylic_level": "Nível acrílico:",

res/lang/ru.json

@@ -1312,7 +1312,7 @@
     "sent_filter": "Отправлено",
     "sent_type": "Отправлено",
     "sent_upper": "ОТПРАВЛЕНО",
-    "set_label": "Установить метку...",
+    "set_label": "Установить метку",
     "settings": "Настройки",
     "settings_about_text": "Защищённый криптовалютный кошелёк для DragonX (DRGX), созданный на Dear ImGui для лёгкого и портативного использования.",
     "settings_acrylic_level": "Уровень акрила:",

res/lang/zh.json

@@ -1310,7 +1310,7 @@
     "sent_filter": "已发送",
     "sent_type": "已发送",
     "sent_upper": "已发送",
-    "set_label": "设置标签...",
+    "set_label": "设置标签",
     "settings": "设置",
     "settings_about_text": "DragonX (DRGX) 屏蔽加密货币钱包，使用 Dear ImGui 构建，提供轻量、便携的体验。",
     "settings_acrylic_level": "亚克力级别：",