feat: PC 화면 해상도 변경 — 설정에서 창 크기 프리셋 선택

- electron/preload.cjs: contextBridge 로 window.desktop.setWindowSize 노출
- main.cjs: preload 연결 + ipcMain 'window:setSize'/'getSize' 핸들러
- SettingsView: PC(window.desktop 존재 시)에서 해상도 선택 추가
  (1024×720 ~ 1920×1080), 선택 시 창 크기 변경+가운데 정렬

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/views/settings/SettingsView.vue

@@ -15,6 +15,22 @@ const THEMES = [
 const appVersion = typeof __APP_VERSION__ !== 'undefined' ? __APP_VERSION__ : '-'
 const clearing = ref(false)
 
+// PC(데스크톱) 전용: 창 해상도 변경 (Electron preload 의 window.desktop 존재 시에만)
+const isDesktop = typeof window !== 'undefined' && !!window.desktop
+const RESOLUTIONS = [
+  { label: '1024 × 720', w: 1024, h: 720 },
+  { label: '1280 × 800', w: 1280, h: 800 },
+  { label: '1366 × 768', w: 1366, h: 768 },
+  { label: '1600 × 900', w: 1600, h: 900 },
+  { label: '1920 × 1080', w: 1920, h: 1080 },
+]
+function onResolution(e) {
+  const v = e.target.value
+  if (!v) return
+  const [w, h] = v.split('x').map(Number)
+  window.desktop?.setWindowSize(w, h)
+}
+
 async function clearAppData() {
   if (clearing.value) return
   const ok = await dialog.confirm(
@@ -62,6 +78,20 @@ async function clearAppData() {
       </div>
     </section>
 
+    <!-- PC(데스크톱) 전용: 창 해상도 -->
+    <section v-if="isDesktop" class="card">
+      <div class="row">
+        <div class="row-main">
+          <span class="row-label">화면 해상도</span>
+          <span class="row-sub">데스크톱 창 크기를 선택한 크기로 변경</span>
+        </div>
+        <select class="res-select" @change="onResolution">
+          <option value="">선택</option>
+          <option v-for="r in RESOLUTIONS" :key="r.label" :value="`${r.w}x${r.h}`">{{ r.label }}</option>
+        </select>
+      </div>
+    </section>
+
     <section class="card">
       <RouterLink to="/settings/account" class="row row-link">
         <div class="row-main">
@@ -164,6 +194,10 @@ async function clearAppData() {
   overflow: hidden;
   flex-shrink: 0;
 }
+.res-select {
+  flex: none;
+  max-width: 150px;
+}
 .seg-btn {
   padding: 0.4rem 0.7rem;
   border: 0;