diff --git a/frontend/src/features/models/pages/ModelsList.vue b/frontend/src/features/models/pages/ModelsList.vue
index 21780131..29b7021c 100644
--- a/frontend/src/features/models/pages/ModelsList.vue
+++ b/frontend/src/features/models/pages/ModelsList.vue
@@ -119,7 +119,7 @@ onUnmounted(() => {
     <KbxListPage
       :screen="screenDef"
       :data-state="dataState"
-      :loading="isLoading"
+      :loading="dataState === 'pending'"
       :summary-items="summaryItems"
       :quick-filters="quickFilters"
       @quick-filter="handleQuickFilter"
@@ -174,8 +174,8 @@ onUnmounted(() => {
       <template #content>
         <KbxDataGrid
           v-if="screenDef.grid && modelsQuery.data.value?.items"
-          :columns="screenDef.grid.columnDefs"
-          :rows="modelsQuery.data.value.items"
+          :columns="modelsQuery.data.value?.items.length ? screenDef.grid.columnDefs : []"
+          :rows="modelsQuery.data.value?.items || []"
           :loading="modelsQuery.isPending.value"
           @row-click="handleRowClick"
         />
diff --git a/frontend/src/features/shadow-run/pages/ShadowRunList.vue b/frontend/src/features/shadow-run/pages/ShadowRunList.vue
index e5f12577..a1c98652 100644
--- a/frontend/src/features/shadow-run/pages/ShadowRunList.vue
+++ b/frontend/src/features/shadow-run/pages/ShadowRunList.vue
@@ -118,7 +118,7 @@ onUnmounted(() => {
     <KbxListPage
       :screen="screenDef"
       :data-state="dataState"
-      :loading="isLoading"
+      :loading="dataState === 'pending'"
       :summary-items="summaryItems"
       :quick-filters="quickFilters"
       @quick-filter="handleQuickFilter"
@@ -173,8 +173,8 @@ onUnmounted(() => {
       <template #content>
         <KbxDataGrid
           v-if="screenDef.grid && shadowRunsQuery.data.value?.items"
-          :columns="screenDef.grid.columnDefs"
-          :rows="shadowRunsQuery.data.value.items"
+          :columns="shadowRunsQuery.data.value?.items.length ? screenDef.grid.columnDefs : []"
+          :rows="shadowRunsQuery.data.value?.items || []"
           :loading="shadowRunsQuery.isPending.value"
           @row-click="handleRowClick"
         />
diff --git a/frontend/src/shared/contracts/kbx-types.ts b/frontend/src/shared/contracts/kbx-types.ts
index f226a293..b8e0d17a 100644
--- a/frontend/src/shared/contracts/kbx-types.ts
+++ b/frontend/src/shared/contracts/kbx-types.ts
@@ -12,6 +12,7 @@ export interface KbxScreenDefinition {
   path: string                  // Vue Router path
   component: () => Promise<any> // Lazy-loaded component
   permissions: string[]         // Required permissions (e.g., ['model.read'])
+  description?: string          // Screen description
   help?: KbxHelpDefinition
   grid?: KbxGridDefinition
   shortcuts?: KbxShortcut[]
@@ -20,9 +21,9 @@ export interface KbxScreenDefinition {
 
 // Grid Column Definition
 export interface KbxGridColumn<T = any> {
-  field: keyof T
+  field: string | number | symbol
   header: string
-  type?: 'text' | 'number' | 'date' | 'status' | 'link' | 'money' | 'quantity'
+  type?: 'text' | 'number' | 'date' | 'datetime' | 'percentage' | 'status' | 'link' | 'money' | 'quantity'
   width?: number | string
   pinned?: 'left' | 'right'
   sortable?: boolean
diff --git a/frontend/src/shared/ui/adapter/KbxDataGrid.vue b/frontend/src/shared/ui/adapter/KbxDataGrid.vue
index f1a97ef8..54cfdd37 100644
--- a/frontend/src/shared/ui/adapter/KbxDataGrid.vue
+++ b/frontend/src/shared/ui/adapter/KbxDataGrid.vue
@@ -1,6 +1,7 @@
 <script setup lang="ts">
 import { AgGridVue } from 'ag-grid-vue3'
 import { computed, ref } from 'vue'
+import type { GridOptions } from 'ag-grid-community'
 import type { KbxGridColumn, KbxDensity } from '@shared/contracts/kbx-types'
 
 interface Props<T = any> {
@@ -38,26 +39,29 @@ const densityHeights = {
   touch: 48,
 }
 
-const gridOptions = computed(() => ({
-  columnDefs: props.columns.map(col => ({
-    field: col.field,
+const gridOptions = computed(() => {
+  const colDefs = props.columns.map(col => ({
+    field: String(col.field),
     headerName: col.header,
-    width: col.width || 'auto',
-    pinned: col.pinned,
+    width: typeof col.width === 'number' ? col.width : undefined,
+    pinned: col.pinned || undefined,
     sortable: col.sortable !== false,
     filter: col.filterable !== false,
-    type: col.type,
-  })),
-  rowData: props.rows,
-  rowSelection: props.allowSelection ? 'multiple' : undefined,
-  rowHeight: densityHeights[props.density],
-  pagination: !props.serverSideDatasource,
-  paginationPageSize: props.pageSize,
-  suppressMovableColumns: false,
-  suppressColumnMoveAnimation: false,
-  headerHeight: 36,
-  theme: 'ag-theme-quartz',
-}))
+  }))
+
+  return {
+    columnDefs: colDefs,
+    rowData: props.rows,
+    rowSelection: props.allowSelection ? ('multiple' as const) : undefined,
+    rowHeight: densityHeights[props.density],
+    pagination: !props.serverSideDatasource,
+    paginationPageSize: props.pageSize,
+    suppressMovableColumns: false,
+    suppressColumnMoveAnimation: false,
+    headerHeight: 36,
+    theme: 'ag-theme-quartz',
+  } as unknown as GridOptions<any>
+})
 
 const onSelectionChanged = (event: any) => {
   selectedRows.value = event.api.getSelectedRows()
diff --git a/frontend/src/shared/ui/adapter/KbxInput.vue b/frontend/src/shared/ui/adapter/KbxInput.vue
index c99541e4..2ffbd8e3 100644
--- a/frontend/src/shared/ui/adapter/KbxInput.vue
+++ b/frontend/src/shared/ui/adapter/KbxInput.vue
@@ -3,7 +3,7 @@ import PInputText from 'primevue/inputtext'
 import { computed } from 'vue'
 
 interface Props {
-  modelValue?: string | number
+  modelValue?: string | null
   type?: 'text' | 'email' | 'password' | 'number' | 'date'
   placeholder?: string
   disabled?: boolean
@@ -17,7 +17,7 @@ interface Props {
 const props = withDefaults(defineProps<Props>(), {
   modelValue: '',
   type: 'text',
-  placeholder: '',
+  placeholder: undefined,
   disabled: false,
   readonly: false,
   invalid: false,
@@ -25,7 +25,7 @@ const props = withDefaults(defineProps<Props>(), {
 })
 
 const emit = defineEmits<{
-  'update:modelValue': [value: string | number]
+  'update:modelValue': [value: string]
   focus: []
   blur: []
 }>()
@@ -44,14 +44,14 @@ const inputClasses = computed(() => ({
     </label>
 
     <PInputText
-      :model-value="modelValue"
+      :model-value="modelValue || ''"
       :type="type"
-      :placeholder="placeholder"
+      :placeholder="placeholder || ''"
       :disabled="disabled"
       :readonly="readonly"
       :class="inputClasses"
       class="kbx-input"
-      @update:model-value="emit('update:modelValue', $event)"
+      @update:model-value="emit('update:modelValue', $event || '')"
       @focus="emit('focus')"
       @blur="emit('blur')"
     />
diff --git a/frontend/tsconfig.json b/frontend/tsconfig.json
index eb333b5f..4e4afd4f 100644
--- a/frontend/tsconfig.json
+++ b/frontend/tsconfig.json
@@ -8,7 +8,11 @@
     "resolveJsonModule": true,
     "esModuleInterop": true,
     "baseUrl": ".",
-    "paths": { "@/*": ["src/*"] },
+    "paths": {
+      "@/*": ["src/*"],
+      "@shared/*": ["src/shared/*"],
+      "@features/*": ["src/features/*"]
+    },
     "lib": ["ES2023", "ESNext", "DOM", "DOM.Iterable"],
     "types": ["vitest/globals", "node"]
   },
diff --git a/frontend/vite.config.ts b/frontend/vite.config.ts
index 2494041f..a89b1275 100644
--- a/frontend/vite.config.ts
+++ b/frontend/vite.config.ts
@@ -7,7 +7,11 @@ const apiTarget = process.env.VITE_API_TARGET || 'http://localhost:5000'
 export default defineConfig({
   plugins: [vue()],
   resolve: {
-    alias: { '@': fileURLToPath(new URL('./src', import.meta.url)) },
+    alias: {
+      '@': fileURLToPath(new URL('./src', import.meta.url)),
+      '@shared': fileURLToPath(new URL('./src/shared', import.meta.url)),
+      '@features': fileURLToPath(new URL('./src/features', import.meta.url)),
+    },
     extensions: ['.ts', '.tsx', '.vue', '.js', '.jsx', '.json']
   },
   server: { proxy: { '/api': apiTarget } },