feat: rework downloads widget with mantine-datatable

- Replace mantine-react-table with mantine-datatable for a cleaner, lighter table
- Add right-click context menu with pause/resume/delete/copy actions
- Add row expansion for inline detail view (replaces modal)
- Implement responsive scaling based on widget width
- Add footer filter panel with client and status filtering
- Show status badges with color-coded indicators
- Display speed indicators with icons in column cells
- Add global ratio, total speeds, and item count in footer
- Sort always enabled (removed confusing enableRowSorting toggle)
- Reorder default columns to prioritize useful information
- Update docs and translations

packages/translation/src/lang/en.json

@@ -3174,7 +3174,15 @@
           }
         }
       },
-      "globalRatio": "Global Ratio"
+      "globalRatio": "Global Ratio",
+      "contextMenu": {
+        "copyName": "Copy name",
+        "copyId": "Copy ID",
+        "clearFilters": "Clear filters"
+      },
+      "footer": {
+        "filter": "Filter downloads"
+      }
     },
     "mediaReleases": {
       "name": "Media releases",