fix: Android APK 다운로드 window.open, CI npm ci 보강

@capacitor/browser 제거하고 네이티브 WebView에서 window.open 사용.
app node_modules 누락 시 root npm ci 실행.

Co-authored-by: Cursor <cursoragent@cursor.com>

package-lock.json

@@ -18,7 +18,6 @@
       "dependencies": {
         "@capacitor/android": "^7.0.0",
         "@capacitor/app": "^7.0.0",
-        "@capacitor/browser": "^7.0.5",
         "@capacitor/core": "^7.0.0",
         "@capacitor/haptics": "^7.0.0",
         "@capacitor/ios": "^7.0.0",
@@ -422,15 +421,6 @@
         "@capacitor/core": ">=7.0.0"
       }
     },
-    "node_modules/@capacitor/browser": {
-      "version": "7.0.5",
-      "resolved": "https://registry.npmjs.org/@capacitor/browser/-/browser-7.0.5.tgz",
-      "integrity": "sha512-YF/kC1m1e6c81X/agtAnYItVlqiQ/nXLG+Q3QXNDuiMoRynqa3Guu8ZaV9kWvqQcHoE2w18xz7WGpPOuh+R1fA==",
-      "license": "MIT",
-      "peerDependencies": {
-        "@capacitor/core": ">=7.0.0"
-      }
-    },
     "node_modules/@capacitor/cli": {
       "version": "7.6.5",
       "resolved": "https://registry.npmjs.org/@capacitor/cli/-/cli-7.6.5.tgz",