components/wysiwyg/Canvas.nudge.test.tsx

@@ -41,4 +41,31 @@ describe('WYSIWYG Canvas keyboard nudge with 8px snap', () => {
     const obj = getByTestId('obj-o1')
     expect(obj).toHaveStyle({ top: '96px' }) // 100 - 1 => 99 -> snap8 => 96
   })
+
+  it('Shift+ArrowRight nudges by 1px without grid snap', () => {
+    const frame = makeFrame()
+    const { getByTestId } = render(<Canvas frame={frame} />)
+    const canvas = getByTestId('wysiwyg-canvas')
+    fireEvent.keyDown(canvas, { key: 'ArrowRight', shiftKey: true })
+    const obj = getByTestId('obj-o1')
+    expect(obj).toHaveStyle({ left: '102px' }) // 101 + 1 => 102 (no snap)
+  })
+
+  it('Shift+ArrowUp nudges by 1px without grid snap', () => {
+    const frame = makeFrame()
+    const { getByTestId } = render(<Canvas frame={frame} />)
+    const canvas = getByTestId('wysiwyg-canvas')
+    fireEvent.keyDown(canvas, { key: 'ArrowUp', shiftKey: true })
+    const obj = getByTestId('obj-o1')
+    expect(obj).toHaveStyle({ top: '99px' }) // 100 - 1 => 99 (no snap)
+  })
+
+  it('Alt+ArrowRight nudges by 16px and snaps to grid', () => {
+    const frame = makeFrame()
+    const { getByTestId } = render(<Canvas frame={frame} />)
+    const canvas = getByTestId('wysiwyg-canvas')
+    fireEvent.keyDown(canvas, { key: 'ArrowRight', altKey: true })
+    const obj = getByTestId('obj-o1')
+    expect(obj).toHaveStyle({ left: '120px' }) // 101 + 16 = 117 -> snap8 => 120
+  })
 })

components/wysiwyg/Canvas.tsx

@@ -56,15 +56,23 @@ export function Canvas({ frame, onChange }: CanvasProps) {
   const onKeyDown = useCallback((e: React.KeyboardEvent) => {
     if (!selected) return
     let dx = 0, dy = 0
-    if (e.key === 'ArrowLeft') dx = -1
-    else if (e.key === 'ArrowRight') dx = 1
-    else if (e.key === 'ArrowUp') dy = -1
-    else if (e.key === 'ArrowDown') dy = 1
+    let step = 1
+    let useSnap = true
+    // Shift: 미세 이동(1px, 스냅 없음), Alt: 가속 이동(16px, 스냅 적용)
+    if (e.shiftKey) { step = 1; useSnap = false }
+    else if (e.altKey) { step = 16; useSnap = true }
+
+    if (e.key === 'ArrowLeft') dx = -step
+    else if (e.key === 'ArrowRight') dx = step
+    else if (e.key === 'ArrowUp') dy = -step
+    else if (e.key === 'ArrowDown') dy = step
     else return
     e.preventDefault()
     updateObject(selected.id, (o) => {
-      const nx = snap8(o.x + dx)
-      const ny = snap8(o.y + dy)
+      const tx = o.x + dx
+      const ty = o.y + dy
+      const nx = useSnap ? snap8(tx) : tx
+      const ny = useSnap ? snap8(ty) : ty
       return { ...o, x: nx, y: ny }
     })
   }, [selected, updateObject])