feat(folder): right-click "영상 주소 복사" on public and admin

- 공개 폴더(/folder/:name): 새 ctxMenu + public-folder.js 로 우클릭 메뉴 신설
  ("영상 주소 복사" 만 포함). 좌클릭 재생 기능은 그대로 유지.
- 관리자 폴더(/op/folder/:name): 기존 ctxMenu 에 "영상 주소 복사" 항목과
  folder.js 에 copyUrl 핸들러 추가.
- 양쪽 모두 navigator.clipboard.writeText(origin + "/player/" + id) 사용,
  실패하면 hidden textarea + execCommand("copy") fallback, 그것도 실패하면
  window.prompt 으로 직접 복사 안내. 성공 시 flashToast 로 피드백.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

public/folder.js

@@ -30,6 +30,8 @@
     var action = btn.getAttribute('data-action')
     if (action === 'edit') {
       location.href = '/op/folder/' + encodeURIComponent(folder) + '/video/editor?id=' + encodeURIComponent(targetId)
+    } else if (action === 'copyUrl') {
+      copyVideoUrl(targetId)
     } else if (action === 'rename') {
       var t = window.prompt('새 영상 제목', targetTitle)
       if (t && t !== targetTitle) {
@@ -56,4 +58,44 @@
     }
     hideCtx()
   })
+
+  function copyVideoUrl(id) {
+    var url = location.origin + '/player/' + encodeURIComponent(id)
+    if (navigator.clipboard && navigator.clipboard.writeText) {
+      navigator.clipboard.writeText(url).then(function () {
+        flashToast('주소가 복사되었습니다.')
+      }, function () {
+        fallbackCopy(url)
+      })
+    } else {
+      fallbackCopy(url)
+    }
+  }
+  function fallbackCopy(text) {
+    try {
+      var ta = document.createElement('textarea')
+      ta.value = text
+      ta.style.position = 'fixed'
+      ta.style.left = '-9999px'
+      document.body.appendChild(ta)
+      ta.focus(); ta.select()
+      var ok = document.execCommand && document.execCommand('copy')
+      document.body.removeChild(ta)
+      if (ok) flashToast('주소가 복사되었습니다.')
+      else window.prompt('주소를 복사하세요:', text)
+    } catch (e) {
+      window.prompt('주소를 복사하세요:', text)
+    }
+  }
+  function flashToast(msg) {
+    var el = document.createElement('div')
+    el.className = 'flashToast'
+    el.textContent = msg
+    document.body.appendChild(el)
+    requestAnimationFrame(function () { el.classList.add('show') })
+    setTimeout(function () {
+      el.classList.remove('show')
+      setTimeout(function () { el.parentNode && el.parentNode.removeChild(el) }, 200)
+    }, 1500)
+  }
 })()

public/public-folder.js

@@ -0,0 +1,75 @@
+(function () {
+  var ctxMenu = document.getElementById('ctxMenu')
+  if (!ctxMenu) return
+  var targetId = null
+
+  function showCtx(x, y) {
+    ctxMenu.style.left = x + 'px'
+    ctxMenu.style.top = y + 'px'
+    ctxMenu.hidden = false
+  }
+  function hideCtx() { ctxMenu.hidden = true }
+
+  document.querySelectorAll('.videoCard').forEach(function (card) {
+    card.addEventListener('contextmenu', function (e) {
+      e.preventDefault()
+      targetId = card.getAttribute('data-video-id') || card.getAttribute('data-id')
+      showCtx(e.clientX, e.clientY)
+    })
+  })
+
+  document.addEventListener('click', function (e) {
+    if (!ctxMenu.contains(e.target)) hideCtx()
+  })
+  document.addEventListener('scroll', hideCtx, true)
+
+  ctxMenu.addEventListener('click', function (e) {
+    var btn = e.target.closest('button')
+    if (!btn) return
+    var action = btn.getAttribute('data-action')
+    if (action === 'copyUrl' && targetId) {
+      copyVideoUrl(targetId)
+    }
+    hideCtx()
+  })
+
+  function copyVideoUrl(id) {
+    var url = location.origin + '/player/' + encodeURIComponent(id)
+    if (navigator.clipboard && navigator.clipboard.writeText) {
+      navigator.clipboard.writeText(url).then(function () {
+        flashToast('주소가 복사되었습니다.')
+      }, function () {
+        fallbackCopy(url)
+      })
+    } else {
+      fallbackCopy(url)
+    }
+  }
+  function fallbackCopy(text) {
+    try {
+      var ta = document.createElement('textarea')
+      ta.value = text
+      ta.style.position = 'fixed'
+      ta.style.left = '-9999px'
+      document.body.appendChild(ta)
+      ta.focus(); ta.select()
+      var ok = document.execCommand && document.execCommand('copy')
+      document.body.removeChild(ta)
+      if (ok) flashToast('주소가 복사되었습니다.')
+      else window.prompt('주소를 복사하세요:', text)
+    } catch (e) {
+      window.prompt('주소를 복사하세요:', text)
+    }
+  }
+  function flashToast(msg) {
+    var el = document.createElement('div')
+    el.className = 'flashToast'
+    el.textContent = msg
+    document.body.appendChild(el)
+    requestAnimationFrame(function () { el.classList.add('show') })
+    setTimeout(function () {
+      el.classList.remove('show')
+      setTimeout(function () { el.parentNode && el.parentNode.removeChild(el) }, 200)
+    }, 1500)
+  }
+})()

public/styles.css

@@ -146,6 +146,17 @@ body.siteBody.centerLayout { display: flex; align-items: center; justify-content
 }
 .ctxMenu button:hover { background: var(--bg-alt); }
 
+.flashToast {
+  position: fixed; left: 50%; bottom: 32px; transform: translate(-50%, 12px);
+  background: var(--bg-card); color: var(--text);
+  border: 1px solid var(--border); border-radius: 8px;
+  padding: 10px 18px; font-size: 14px;
+  box-shadow: 0 8px 20px rgba(0,0,0,0.4);
+  opacity: 0; transition: opacity 180ms ease, transform 180ms ease;
+  z-index: 300; pointer-events: none;
+}
+.flashToast.show { opacity: 1; transform: translate(-50%, 0); }
+
 /* modal */
 .modalOverlay {
   position: fixed; inset: 0; background: rgba(0,0,0,0.6);