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/FileDropZone.tsx

@@ -3,9 +3,7 @@
 
 import { useState, useEffect, useCallback, useRef } from 'react'
 import { Box, LinearProgress, IconButton, Tooltip } from '@mui/material'
-import ContentCopyIcon from '@mui/icons-material/ContentCopy'
-import CloseIcon from '@mui/icons-material/Close'
-import UploadFileIcon from '@mui/icons-material/UploadFile'
+import { Copy, X, FileUp } from 'lucide-react'
 import { MetalCard, PhosphorText, Led } from '@d3ro/ui/components/ds'
 import { d3roPalette, d3roTypo } from '@d3ro/ui/theme'
 import { useI18n } from '@d3ro/i18n'
@@ -136,7 +134,7 @@ export function FileDropZone(): React.ReactElement {
             '&:hover': { borderColor: d3roPalette.accent.amber },
           }}
         >
-          <UploadFileIcon sx={{ fontSize: 40, color: d3roPalette.text.inactive, mb: 1 }} />
+          <FileUp size={40} style={{ color: d3roPalette.text.inactive, marginBottom: 8 }} />
           <PhosphorText variant="body" sx={{ color: d3roPalette.text.secondary }}>
             {t('fileTranscription.dropZone')}
           </PhosphorText>
@@ -216,11 +214,11 @@ export function FileDropZone(): React.ReactElement {
             <Box sx={{ display: 'flex', gap: 0.5 }}>
               <Tooltip title={copied ? 'Copied!' : t('fileTranscription.copyAll')}>
                 <IconButton size="small" onClick={handleCopy}>
-                  <ContentCopyIcon sx={{ fontSize: 16, color: copied ? d3roPalette.accent.amber : d3roPalette.text.inactive }} />
+                  <Copy size={16} style={{ color: copied ? d3roPalette.accent.amber : d3roPalette.text.inactive }} />
                 </IconButton>
               </Tooltip>
               <IconButton size="small" onClick={handleReset}>
-                <CloseIcon sx={{ fontSize: 16, color: d3roPalette.text.inactive }} />
+                <X size={16} style={{ color: d3roPalette.text.inactive }} />
               </IconButton>
             </Box>
           </Box>