Phase 1+2 구현: Electron 뼈대 + STT/핫키/오케스트레이터

Phase 1:
- 프로젝트 초기화 (TypeScript strict, electron-vite, ESLint, Prettier)
- shared 타입 (ipc-channels 113채널, types, errors, constants)
- 메인 프로세스 뼈대 (bootstrap, lifecycle, 단일 인스턴스)
- LoggerService, ConfigService (electron-store ESM dynamic import)
- React 19 + MUI 7 Dashboard, 시스템 트레이

Phase 2:
- AudioCaptureService (node-record-lpcm16, PCM16 16kHz mono)
- HotkeyService (uiohook-napi, 더블프레스, holdMode/toggleMode)
- LocalSTTService (faster-whisper Python sidecar, 이중 조건 플러시)
- VoiceModeService 오케스트레이터 (이중 상태머신, Action Queue)
- Python sidecar (FastAPI: health/load/transcribe/shutdown)
- IPC 핸들러 (voice, stt, hotkey) + Preload API 확장

src/renderer/pages/DashboardPage.tsx

@@ -0,0 +1,67 @@
+// src/renderer/pages/DashboardPage.tsx
+
+import { Box, Card, CardContent, Typography, Grid } from '@mui/material'
+import MicIcon from '@mui/icons-material/Mic'
+import TimerIcon from '@mui/icons-material/Timer'
+import TextFieldsIcon from '@mui/icons-material/TextFields'
+import TodayIcon from '@mui/icons-material/Today'
+
+interface StatCardProps {
+  title: string
+  value: string
+  icon: React.ReactElement
+}
+
+function StatCard({ title, value, icon }: StatCardProps): React.ReactElement {
+  return (
+    <Card>
+      <CardContent>
+        <Box sx={{ display: 'flex', alignItems: 'center', gap: 1, mb: 1 }}>
+          <Box sx={{ color: 'primary.main' }}>{icon}</Box>
+          <Typography variant="body2" color="text.secondary">
+            {title}
+          </Typography>
+        </Box>
+        <Typography variant="h4">{value}</Typography>
+      </CardContent>
+    </Card>
+  )
+}
+
+export function DashboardPage(): React.ReactElement {
+  return (
+    <Box>
+      <Typography variant="h5" sx={{ mb: 3, fontWeight: 600 }}>
+        Dashboard
+      </Typography>
+
+      <Grid container spacing={2}>
+        <Grid size={{ xs: 12, sm: 6, md: 3 }}>
+          <StatCard title="Total Sessions" value="0" icon={<MicIcon />} />
+        </Grid>
+        <Grid size={{ xs: 12, sm: 6, md: 3 }}>
+          <StatCard title="Total Time" value="0:00" icon={<TimerIcon />} />
+        </Grid>
+        <Grid size={{ xs: 12, sm: 6, md: 3 }}>
+          <StatCard title="Total Words" value="0" icon={<TextFieldsIcon />} />
+        </Grid>
+        <Grid size={{ xs: 12, sm: 6, md: 3 }}>
+          <StatCard title="Streak" value="0 days" icon={<TodayIcon />} />
+        </Grid>
+      </Grid>
+
+      <Box sx={{ mt: 4 }}>
+        <Typography variant="h6" sx={{ mb: 2 }}>
+          Recent Sessions
+        </Typography>
+        <Card>
+          <CardContent>
+            <Typography variant="body2" color="text.secondary" sx={{ textAlign: 'center', py: 4 }}>
+              No sessions yet. Press the hotkey to start recording.
+            </Typography>
+          </CardContent>
+        </Card>
+      </Box>
+    </Box>
+  )
+}