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/pages/MeetingModePage.tsx

@@ -9,9 +9,7 @@ import {
   Snackbar,
   Alert,
 } from '@mui/material'
-import AddIcon from '@mui/icons-material/Add'
-import StopIcon from '@mui/icons-material/Stop'
-import FiberManualRecordIcon from '@mui/icons-material/FiberManualRecord'
+import { Plus, Square, Circle } from 'lucide-react'
 import { MetalCard, PhosphorText, Led, PhysicalButton, ScreenPanel } from '@d3ro/ui/components/ds'
 import { MeetingDetailTabs } from '../components/meeting/MeetingDetailTabs'
 import { EditableSegment } from '../components/meeting/EditableSegment'
@@ -229,7 +227,7 @@ export function MeetingModePage(): React.ReactElement {
           count={totalSessions > 0 ? t('meeting.sessions', { count: totalSessions }) : undefined}
           action={
             <PhysicalButton size="small" onClick={handleStartRecording}>
-              <AddIcon sx={{ fontSize: 16, mr: 0.5 }} />
+              <Plus size={16} style={{ marginRight: 4 }} />
               {t('meeting.newMeeting')}
             </PhysicalButton>
           }
@@ -344,7 +342,7 @@ export function MeetingModePage(): React.ReactElement {
         {/* 상단 바 */}
         <Box sx={{ display: 'flex', justifyContent: 'space-between', alignItems: 'center', mb: 2 }}>
           <Box sx={{ display: 'flex', alignItems: 'center', gap: 2 }}>
-            <FiberManualRecordIcon sx={{ color: d3roPalette.tag.red, fontSize: 16, animation: 'pulse 1s infinite' }} />
+            <Circle size={16} fill="currentColor" style={{ color: d3roPalette.tag.red, animation: 'pulse 1s infinite' }} />
             <PhosphorText variant="label" sx={{ fontFamily: d3roFontMono }}>
               {formatTime(elapsedMs)}
             </PhosphorText>
@@ -354,7 +352,7 @@ export function MeetingModePage(): React.ReactElement {
           </Box>
           {!isProcessing && (
             <PhysicalButton size="small" color="error" onClick={handleStopRecording}>
-              <StopIcon sx={{ fontSize: 16, mr: 0.5 }} />
+              <Square size={16} style={{ marginRight: 4 }} />
               {t('meeting.stopRecording')}
             </PhysicalButton>
           )}