feat(fe): support explicit relative flex ratios per grid column

frontend/src/shared/ui/adapter/contracts.ts

@@ -50,6 +50,7 @@ export interface UiGridColumn {
   header: string
   width?: number
   minWidth?: number
+  flex?: number
   sortable?: boolean
   filterable?: boolean
   sensitive?: boolean

frontend/src/shared/ui/components/KsDataGrid.vue

@@ -12,8 +12,8 @@ const columnDefs = computed<ColDef[]>(() => props.columns.map(column => ({
   field: column.field,
   headerName: column.header,
   width: column.width,
-  minWidth: column.minWidth ?? 100,
-  flex: column.width ? undefined : 1,
+  minWidth: column.minWidth ?? 80,
+  flex: column.flex ?? (column.width ? undefined : 1),
   sortable: column.sortable ?? true,
   filter: column.filterable ?? true,
   valueFormatter: column.formatter ? params => column.formatter?.(params.value, params.data) ?? '' : undefined