feat(bar): add workspace numbers to TaskbarGrouped widget

Add workspace number badges to TaskbarGrouped widget that display in the
top-left corner of task groups, similar to existing Workspace widget
styling.

Features:
- Circular workspace number badges with negative margins for border overlap
- Color states: focused (primary), urgent (error), occupied (secondary), empty (outline)
- Burst animation effects when workspace becomes focused
- User-configurable settings: showWorkspaceNumbers, showNumbersOnlyWhenOccupied
- Comprehensive internationalization support for all supported locales

Implementation:
- Enhanced TaskbarGrouped.qml with workspace number display and animation system
- Created TaskbarGroupedSettings.qml for user configuration
- Updated BarWidgetRegistry.qml with default settings metadata
- Added settings dialog mapping in BarWidgetSettingsDialog.qml
- Added translations for all supported locales (en, de, es, fr, pt, zh-CN, uk-UA)

The workspace numbers provide quick visual identification of workspace
assignment while maintaining the clean aesthetic of the taskbar.

Assets/Translations/de.json

@@ -1258,6 +1258,16 @@
           "description": "Theme-Farben auf Taskbar-Symbole anwenden."
         }
       },
+      "taskbar-grouped": {
+        "show-workspace-numbers": {
+          "label": "Arbeitsbereichsnummern anzeigen",
+          "description": "Arbeitsbereichsnummern in der oberen linken Ecke der Task-Gruppen anzeigen."
+        },
+        "show-numbers-only-when-occupied": {
+          "label": "Nur bei belegten Arbeitsbereichen anzeigen",
+          "description": "Arbeitsbereichsnummern nur für Arbeitsbereiche mit geöffneten Fenstern anzeigen."
+        }
+      },
       "tray": {
         "colorize-icons": {
           "label": "Symbole einfärben",

Assets/Translations/en.json

@@ -1241,6 +1241,16 @@
           "description": "Apply theme colors to taskbar icons."
         }
       },
+      "taskbar-grouped": {
+        "show-workspace-numbers": {
+          "label": "Show workspace numbers",
+          "description": "Display workspace numbers in the top-left corner of task groups."
+        },
+        "show-numbers-only-when-occupied": {
+          "label": "Show numbers only when occupied",
+          "description": "Only show workspace numbers for workspaces that have open windows."
+        }
+      },
       "tray": {
         "colorize-icons": {
           "label": "Colorize Icons",

Assets/Translations/es.json

@@ -1241,6 +1241,16 @@
           "description": "Aplicar colores del tema a los iconos de la barra de tareas."
         }
       },
+      "taskbar-grouped": {
+        "show-workspace-numbers": {
+          "label": "Mostrar números de espacio de trabajo",
+          "description": "Mostrar números de espacio de trabajo en la esquina superior izquierda de los grupos de tareas."
+        },
+        "show-numbers-only-when-occupied": {
+          "label": "Mostrar números solo cuando estén ocupados",
+          "description": "Mostrar números de espacio de trabajo solo para espacios de trabajo con ventanas abiertas."
+        }
+      },
       "tray": {
         "colorize-icons": {
           "label": "Colorear iconos",

Assets/Translations/fr.json

@@ -1241,6 +1241,16 @@
           "description": "Appliquer les couleurs du thème aux icônes de la barre des tâches."
         }
       },
+      "taskbar-grouped": {
+        "show-workspace-numbers": {
+          "label": "Afficher les numéros d'espace de travail",
+          "description": "Afficher les numéros d'espace de travail dans le coin supérieur gauche des groupes de tâches."
+        },
+        "show-numbers-only-when-occupied": {
+          "label": "Afficher les numéros seulement lorsqu'occupés",
+          "description": "Afficher les numéros d'espace de travail uniquement pour les espaces de travail avec des fenêtres ouvertes."
+        }
+      },
       "tray": {
         "colorize-icons": {
           "label": "Coloriser les icônes",

Assets/Translations/pt.json

@@ -1241,6 +1241,16 @@
           "description": "Controla como o widget se comporta quando não há janelas correspondentes."
         }
       },
+      "taskbar-grouped": {
+        "show-workspace-numbers": {
+          "label": "Mostrar números do espaço de trabalho",
+          "description": "Exibir números do espaço de trabalho no canto superior esquerdo dos grupos de tarefas."
+        },
+        "show-numbers-only-when-occupied": {
+          "label": "Mostrar números apenas quando ocupados",
+          "description": "Mostrar números do espaço de trabalho apenas para espaços de trabalho com janelas abertas."
+        }
+      },
       "tray": {
         "colorize-icons": {
           "label": "Colorir ícones",

Assets/Translations/uk-UA.json

@@ -1241,6 +1241,16 @@
           "description": "Застосувати кольори теми до значків панелі завдань."
         }
       },
+      "taskbar-grouped": {
+        "show-workspace-numbers": {
+          "label": "Показувати номери робочих просторів",
+          "description": "Показувати номери робочих просторів у лівому верхньому куті групи завдань"
+        },
+        "show-numbers-only-when-occupied": {
+          "label": "Показувати номера лише коли зайнято",
+          "description": "Показувати номери лише для робочих просторів з відкритими вікнами"
+        }
+      },
       "tray": {
         "colorize-icons": {
           "label": "Розфарбувати значки",

Assets/Translations/zh-CN.json

@@ -1241,6 +1241,16 @@
           "description": "将主题颜色应用到任务栏图标。"
         }
       },
+      "taskbar-grouped": {
+        "show-workspace-numbers": {
+          "label": "显示工作区编号",
+          "description": "在任务组左上角显示工作区编号"
+        },
+        "show-numbers-only-when-occupied": {
+          "label": "仅在有窗口时显示编号",
+          "description": "只为有打开窗口的工作区显示编号"
+        }
+      },
       "tray": {
         "colorize-icons": {
           "label": "着色图标",