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/MeetingDetailTabs.tsx

@@ -10,10 +10,7 @@ import {
   TextField,
   Tooltip,
 } from '@mui/material'
-import ArrowBackIcon from '@mui/icons-material/ArrowBack'
-import AddIcon from '@mui/icons-material/Add'
-import EditIcon from '@mui/icons-material/Edit'
-import CheckIcon from '@mui/icons-material/Check'
+import { ArrowLeft, Plus, Pencil, Check } from 'lucide-react'
 import { TranscriptTab } from './TranscriptTab'
 import { DocumentTab } from './DocumentTab'
 import { AddDocumentDialog } from './AddDocumentDialog'
@@ -231,7 +228,7 @@ export function MeetingDetailTabs({
         }}
       >
         <IconButton size="small" onClick={onBack}>
-          <ArrowBackIcon sx={{ fontSize: 18, color: d3roPalette.text.secondary }} />
+          <ArrowLeft size={18} style={{ color: d3roPalette.text.secondary }} />
         </IconButton>
 
         {editingTitle ? (
@@ -251,7 +248,7 @@ export function MeetingDetailTabs({
               autoFocus
             />
             <IconButton size="small" onClick={handleSaveTitle}>
-              <CheckIcon sx={{ fontSize: 16, color: d3roPalette.accent.amber }} />
+              <Check size={16} style={{ color: d3roPalette.accent.amber }} />
             </IconButton>
           </Box>
         ) : (
@@ -264,7 +261,7 @@ export function MeetingDetailTabs({
                 size="small"
                 onClick={() => { setEditingTitle(true); setTitleDraft(detail.title ?? '') }}
               >
-                <EditIcon sx={{ fontSize: 15, color: d3roPalette.text.inactive }} />
+                <Pencil size={15} style={{ color: d3roPalette.text.inactive }} />
               </IconButton>
             </Tooltip>
           </>
@@ -303,7 +300,7 @@ export function MeetingDetailTabs({
             <Tab key={doc.id} label={doc.title ?? t('meeting.untitled')} />
           ))}
           <Tab
-            icon={<AddIcon sx={{ fontSize: 16 }} />}
+            icon={<Plus size={16} />}
             label={t('meeting.addDocument')}
             iconPosition="start"
             sx={{ minWidth: 120 }}