feat(web): migrate CRM screens to Ant Design Vue with central theme

Adopt ant-design-vue and a shared antdTheme for leads, pipeline, invoices, and shared form controls under strict single-page governance.

Co-authored-by: Cursor <cursoragent@cursor.com>

apps/web/src/components/pipeline/AddDealButton.vue

@@ -1,6 +1,6 @@
 <script setup lang="ts">
-import UiButton from '@/components/ui/UiButton.vue';
-import UiIcon from '@/components/UiIcon.vue';
+import { PlusOutlined } from '@ant-design/icons-vue';
+import { Button as AButton } from 'ant-design-vue';
 import type { PipelineAccent } from '@/lib/pipeline-board';
 import { PIPELINE_ACCENT } from '@/lib/pipeline-board';
 
@@ -18,15 +18,14 @@ const emit = defineEmits<{
 </script>
 
 <template>
-  <UiButton
-    variant="dashed"
+  <a-button
+    type="dashed"
     block
-    class="add-deal"
     :style="{ color: PIPELINE_ACCENT[accent].text }"
     :aria-label="label"
     @click="emit('add')"
   >
-    <UiIcon name="plus" :size="16" />
+    <template #icon><PlusOutlined /></template>
     {{ label }}
-  </UiButton>
+  </a-button>
 </template>