refactor(frontend): migrate remaining EmptyState patterns (8 files)

Replaced hand-rolled border-dashed empty states with <EmptyState>:
- HealthMatrix, ProviderConfig, ApiKeysTab, dashboards/+page,
  git/+page, MetricsTable, ColumnsTable, DashboardDataGrid

Table empty states wrapped in <tr><td colspan={N}>. Custom SVG icons
preserved via {#snippet icon()}.

frontend/src/lib/components/dashboard/DashboardDataGrid.svelte

@@ -31,7 +31,7 @@
 <script lang="ts">
   // [SECTION: IMPORTS]
   import { t } from '$lib/i18n/index.svelte.js';
-  import { Button, Input } from "$lib/ui";
+  import { Button, EmptyState, Input } from "$lib/ui";
 
   // [SECTION: TYPE EXPORTS]
   export interface Column {
@@ -209,12 +209,13 @@
 
   <!-- ── Empty State ── -->
   {:else if !loading && displayData.length === 0}
-    <div class="flex flex-col items-center justify-center py-12 text-text-subtle rounded-lg border border-dashed border-border">
-      <svg class="w-12 h-12 mb-3" fill="none" stroke="currentColor" viewBox="0 0 24 24">
-        <path stroke-linecap="round" stroke-linejoin="round" stroke-width="1.5" d="M9 17v-2m3 2v-4m3 4v-6m2 10H7a2 2 0 01-2-2V5a2 2 0 012-2h5.586a1 1 0 01.707.293l5.414 5.414a1 1 0 01.293.707V19a2 2 0 01-2 2z"/>
-      </svg>
-      <p class="text-sm">{emptyText || $t.common?.no_data || "No items"}</p>
-    </div>
+    <EmptyState title={emptyText || $t.common?.no_data || "No items"}>
+      {#snippet icon()}
+        <svg class="w-12 h-12" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+          <path stroke-linecap="round" stroke-linejoin="round" stroke-width="1.5" d="M9 17v-2m3 2v-4m3 4v-6m2 10H7a2 2 0 01-2-2V5a2 2 0 012-2h5.586a1 1 0 01.707.293l5.414 5.414a1 1 0 01.293.707V19a2 2 0 01-2 2z"/>
+        </svg>
+      {/snippet}
+    </EmptyState>
 
   <!-- ── Table ── -->
   {:else}

frontend/src/lib/components/health/HealthMatrix.svelte

@@ -9,6 +9,7 @@
 <!-- @UX_STATE Active -> One card highlighted (the current filter). -->
 <script lang="ts">
   import { t } from '$lib/i18n/index.svelte.js';
+  import { EmptyState } from "$lib/ui";
 
   let {
     pass_count = 0,
@@ -116,12 +117,16 @@
     </div>
 
     {#if total === 0}
-      <div class="mt-4 p-8 text-center border-2 border-dashed border-border rounded-xl text-text-subtle">
-        <svg class="w-10 h-10 mx-auto mb-2 text-text-subtle" fill="none" stroke="currentColor" viewBox="0 0 24 24">
-          <path stroke-linecap="round" stroke-linejoin="round" stroke-width="1.5" d="M9 19v-6a2 2 0 00-2-2H5a2 2 0 00-2 2v6a2 2 0 002 2h2a2 2 0 002-2zm0 0V9a2 2 0 012-2h2a2 2 0 012 2v10m-6 0a2 2 0 002 2h2a2 2 0 002-2m0 0V5a2 2 0 012-2h2a2 2 0 012 2v14a2 2 0 01-2 2h-2a2 2 0 01-2-2z" />
-        </svg>
-        <p>{$t.health?.no_records_for_environment || 'No validation records for this environment'}</p>
-      </div>
+      <EmptyState
+        title={$t.health?.no_records_for_environment || 'No validation records for this environment'}
+        class="mt-4"
+      >
+        {#snippet icon()}
+          <svg class="w-10 h-10" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+            <path stroke-linecap="round" stroke-linejoin="round" stroke-width="1.5" d="M9 19v-6a2 2 0 00-2-2H5a2 2 0 00-2 2v6a2 2 0 002 2h2a2 2 0 002-2zm0 0V9a2 2 0 012-2h2a2 2 0 012 2v10m-6 0a2 2 0 002 2h2a2 2 0 002-2m0 0V5a2 2 0 012-2h2a2 2 0 012 2v14a2 2 0 01-2 2h-2a2 2 0 01-2-2z" />
+          </svg>
+        {/snippet}
+      </EmptyState>
     {/if}
   {/if}
 </div>

frontend/src/lib/components/llm/ProviderConfig.svelte

@@ -16,7 +16,7 @@ import { SvelteSet } from "svelte/reactivity";
   import { requestApi } from "$lib/api";
   import { addToast } from "$lib/toasts.svelte.js";
   import HelpTooltip from "$lib/ui/HelpTooltip.svelte";
-  import { ConfirmDialog } from "$lib/ui";
+  import { ConfirmDialog, EmptyState } from "$lib/ui";
 
   let {
     providers = [],
@@ -757,11 +757,7 @@ import { SvelteSet } from "svelte/reactivity";
         </div>
       </div>
     {:else}
-      <div
-        class="text-center py-8 text-text-muted border-2 border-dashed rounded-lg"
-      >
-        {$t.llm.no_providers}
-      </div>
+      <EmptyState title={$t.llm.no_providers} />
     {/each}
   </div>
 </div>

frontend/src/lib/components/settings/ApiKeysTab.svelte

@@ -18,7 +18,7 @@
   import { t } from '$lib/i18n/index.svelte.js';
   import { api } from '$lib/api.js';
   import { addToast } from '$lib/toasts.svelte.js';
-  import { ConfirmDialog } from '$lib/ui';
+  import { ConfirmDialog, EmptyState } from '$lib/ui';
 
   let keys = $state([]);
   let environments = $state([]);
@@ -321,10 +321,7 @@
       {/each}
     </div>
   {:else if keys.length === 0}
-    <!-- Empty State -->
-    <div class="text-center py-8 text-text-muted text-sm border-2 border-dashed border-border rounded-lg">
-      {$t.api_keys?.empty || 'No API keys configured.'}
-    </div>
+    <EmptyState title={$t.api_keys?.empty || 'No API keys configured.'} />
   {:else}
     <!-- Keys Table -->
     <div class="overflow-x-auto border border-border rounded-lg">

frontend/src/routes/dashboards/+page.svelte

@@ -25,7 +25,7 @@
   import DashboardMaintenanceBadge from "$lib/components/DashboardMaintenanceBadge.svelte";
 
   import { environmentContextStore, initializeEnvironmentContext, setSelectedEnvironment } from "$lib/stores/environmentContext.svelte.js";
-  import { Button, Icon, Pagination, Skeleton } from "$lib/ui";
+  import { Button, EmptyState, Icon, Pagination, Skeleton } from "$lib/ui";
   import ColumnFilterPopover from "./ColumnFilterPopover.svelte";
   import { formatDate, getSortIndicator } from "./dashboard-helpers.js";
   import { DashboardHubModel } from "$lib/models/DashboardHubModel.svelte.ts";
@@ -234,34 +234,15 @@
       </div>
     </div>
   {:else if m.dashboards.length === 0}
-    <!-- Empty State -->
-    <div class="py-12 text-center text-text-muted">
-      <svg
-        class="w-16 h-16 mx-auto mb-4 text-text-subtle"
-        xmlns="http://www.w3.org/2000/svg"
-        viewBox="0 0 24 24"
-        fill="none"
-        stroke="currentColor"
-        stroke-width="2"
-      >
-        <path d="M3 3h18v18H3V3zm16 16V5H5v14h14z" />
-      </svg>
-
-      {#if m.effectiveProfileFilter?.applied}
-        <p>{$t.profile?.filter_empty_state || "No dashboards found for active profile filters. Try adjusting your filter settings."}</p>
-        <div class="mt-4">
-          <button
-            type="button"
-            class="rounded border border-primary bg-surface-card px-3 py-1.5 text-xs font-medium text-primary hover:bg-primary-light"
-            onclick={() => m.handleTemporaryShowAll()}
-          >
-            {$t.profile?.filter_show_all_temporarily || "Show all dashboards temporarily"}
-          </button>
-        </div>
-      {:else}
-        <p>{$t.dashboard?.empty}</p>
-      {/if}
-    </div>
+    {#if m.effectiveProfileFilter?.applied}
+      <EmptyState
+        title={$t.profile?.filter_empty_state || "No dashboards found for active profile filters. Try adjusting your filter settings."}
+        actionLabel={$t.profile?.filter_show_all_temporarily || "Show all dashboards temporarily"}
+        onAction={() => m.handleTemporaryShowAll()}
+      />
+    {:else}
+      <EmptyState title={$t.dashboard?.empty} />
+    {/if}
   {:else}
     <!-- Toolbar -->
     <div class="flex items-center justify-between mb-4 gap-4">

frontend/src/routes/datasets/ColumnsTable.svelte

@@ -9,6 +9,7 @@
 <script lang="ts">
   import { t } from "$lib/i18n/index.svelte.js";
   import { api } from "$lib/api.js";
+  import { EmptyState } from "$lib/ui";
 
   let { columns = [], datasetId, envId } = $props();
 
@@ -71,7 +72,7 @@
     </thead>
     <tbody>
       {#if columns.length === 0}
-        <tr><td colspan="4" class="py-4 text-center text-text-subtle">{$t.datasets?.detail_empty ?? 'No data'}</td></tr>
+        <tr><td colspan="4"><EmptyState title={$t.datasets?.detail_empty ?? 'No data'} /></td></tr>
       {:else}
         {#each columns as col (col.id)}
           <tr class="border-b border-border hover:bg-surface-muted {editingRowId && editingRowId !== col.id ? 'opacity-50' : ''}">

frontend/src/routes/datasets/MetricsTable.svelte

@@ -9,6 +9,7 @@
 <script lang="ts">
   import { t } from "$lib/i18n/index.svelte.js";
   import { api } from "$lib/api.js";
+  import { EmptyState } from "$lib/ui";
 
   let { metrics = [], datasetId, envId } = $props();
 
@@ -59,7 +60,7 @@
     </thead>
     <tbody>
       {#if metrics.length === 0}
-        <tr><td colspan="3" class="py-4 text-center text-text-subtle">{$t.datasets?.detail_empty ?? 'No data'}</td></tr>
+        <tr><td colspan="3"><EmptyState title={$t.datasets?.detail_empty ?? 'No data'} /></td></tr>
       {:else}
         {#each metrics as metric (metric.id)}
           <tr class="border-b border-border hover:bg-surface-muted {editingRowId && editingRowId !== metric.id ? 'opacity-50' : ''}">

frontend/src/routes/git/+page.svelte

@@ -21,7 +21,7 @@ import { SvelteSet } from "svelte/reactivity";
   import { gitService } from '../../services/gitService.js';
   import type { DashboardMetadata } from '../../types/dashboard';
   import { t } from '$lib/i18n/index.svelte.js';
-  import { Card, PageHeader, Select } from '$lib/ui';
+  import { Card, EmptyState, PageHeader, Select } from '$lib/ui';
   import {
     environmentContextStore,
     initializeEnvironmentContext,
@@ -244,11 +244,11 @@ import { SvelteSet } from "svelte/reactivity";
           repositoriesOnly={activeTab === 'repos'}
         />
       {:else}
-        <p class="text-text-muted italic">
-          {activeTab === 'repos'
+        <EmptyState
+          title={activeTab === 'repos'
             ? ($t.git?.no_repositories_selected || "No repositories found")
             : ($t.dashboard?.no_dashboards || "No dashboards")}
-        </p>
+        />
       {/if}
     </Card>
   {/if}