feat(ui): Midnight Glass v2 마감 — lucide 아이콘 통일 + 몰입 패널 웨이브 + 팝업 정합

- @mui/icons-material → lucide-react 전환 (23파일, 잔여 0)
- VoiceRecordingPanel: 9바 DOM 웨이브 → GradientWave (canvas)
- Vanilla 팝업 5종 style.css v2 정합 (글래스 네이비/헤어라인/블루,
  CSS 변수 주입 구조 유지 — 테마 반응형 보존)

apps/desktop/src/renderer/components/meeting/DocumentTab.tsx

@@ -3,7 +3,7 @@
 
 import { useCallback, useRef } from 'react'
 import { Box } from '@mui/material'
-import DeleteIcon from '@mui/icons-material/Delete'
+import { Trash2 } from 'lucide-react'
 import { MarkdownEditor } from './MarkdownEditor'
 import { ExportMenu } from './ExportMenu'
 import { PhysicalButton } from '@d3ro/ui/components/ds'
@@ -80,7 +80,7 @@ export function DocumentTab({
           onClick={onDelete}
           sx={{ height: 32, fontSize: d3roTypo.engrave.size }}
         >
-          <DeleteIcon sx={{ fontSize: 14, mr: 0.5 }} />
+          <Trash2 size={14} style={{ marginRight: 4 }} />
           {t('common.delete')}
         </PhysicalButton>
       </Box>