feat: [planning-design] 블록 Ctrl+C/V 복사 붙여넣기 및 Delete 삭제

- Ctrl+C: 선택된 블록 클립보드 복사
- Ctrl+V: 클립보드 블록 붙여넣기 (24px 오프셋)
- Delete/Backspace: 선택된 블록 삭제
- 연속 Ctrl+V 시 오프셋 누적으로 겹침 방지

resources/views/rd/planning-design/index.blade.php

@@ -1961,6 +1961,7 @@ function planningCanvas() {
         _sbBlockDragIdx: null,
         _sbDrag: null,   // { blk, startX, startY, origX, origY }
         _sbResize: null, // { blk, dir, startX, startY, origW, origH }
+        _sbClipboard: null, // copied block data
         sbTplOpen: false,
         sbTplTab: 'preset',
         sbTplSearch: '',
@@ -2760,6 +2761,31 @@ function planningCanvas() {
             if ((e.ctrlKey || e.metaKey) && e.key === 'y') { e.preventDefault(); this.redoAction(); }
             if ((e.ctrlKey || e.metaKey) && e.key === 's') { e.preventDefault(); this.saveProject(); }
             if ((e.ctrlKey || e.metaKey) && e.key === 'd') { e.preventDefault(); this.duplicateNode(); }
+            // 스토리보드 블록 Ctrl+C / Ctrl+V / Delete
+            if (this.viewMode === 'storyboard' && this.sbSelectedBlock) {
+                if ((e.ctrlKey || e.metaKey) && (e.key === 'c' || e.key === 'C')) {
+                    e.preventDefault();
+                    this.sbCopyBlock();
+                    return;
+                }
+                if ((e.ctrlKey || e.metaKey) && (e.key === 'v' || e.key === 'V')) {
+                    e.preventDefault();
+                    this.sbPasteBlock();
+                    return;
+                }
+                if (e.key === 'Delete' || e.key === 'Backspace') {
+                    e.preventDefault();
+                    this.sbDeleteSelectedBlock();
+                    return;
+                }
+            }
+            if (this.viewMode === 'storyboard' && !this.sbSelectedBlock) {
+                if ((e.ctrlKey || e.metaKey) && (e.key === 'v' || e.key === 'V') && this._sbClipboard) {
+                    e.preventDefault();
+                    this.sbPasteBlock();
+                    return;
+                }
+            }
             if ((e.ctrlKey || e.metaKey) && e.key === 'f') {
                 if (this.viewMode === 'kanban' || this.viewMode === 'list') {
                     e.preventDefault();
@@ -2990,6 +3016,39 @@ function planningCanvas() {
             }
         },
 
+        sbCopyBlock() {
+            const page = this.sbCurrentPage;
+            if (!page || !page.blocks) return;
+            const blk = page.blocks.find(b => b.id === this.sbSelectedBlock);
+            if (!blk) return;
+            this._sbClipboard = JSON.parse(JSON.stringify(blk));
+        },
+
+        sbPasteBlock() {
+            if (!this._sbClipboard) return;
+            const page = this.sbCurrentPage;
+            if (!page) return;
+            if (!page.blocks) page.blocks = [];
+            const copy = JSON.parse(JSON.stringify(this._sbClipboard));
+            copy.id = 'blk_' + Date.now() + '_' + Math.random().toString(36).slice(2, 5);
+            copy.x = (copy.x || 0) + 24;
+            copy.y = (copy.y || 0) + 24;
+            page.blocks.push(copy);
+            this.sbSelectedBlock = copy.id;
+            this._sbClipboard = copy; // 연속 붙여넣기 시 오프셋 누적
+            this.autoSave();
+        },
+
+        sbDeleteSelectedBlock() {
+            const page = this.sbCurrentPage;
+            if (!page || !page.blocks) return;
+            const idx = page.blocks.findIndex(b => b.id === this.sbSelectedBlock);
+            if (idx < 0) return;
+            page.blocks.splice(idx, 1);
+            this.sbSelectedBlock = null;
+            this.autoSave();
+        },
+
         sbTableAddRow(blk) {
             const colCount = blk.cols.length;
             blk.rows.push(Array(colCount).fill(''));