feat(sw): viewer follow-up — SVG icon outline, shared SW popup frame, story grid, green layer buttons

- A: SWViewerIcon draws the SWHeader black outline as SVG stroke on a copy behind the icon (no CSS filter)
- B: SWViewerPanel renders the common SWPopup frame (same DOM / CSS) and adds drag, corner resize,
  collapse, bounds and modal; SWPopup gains optional titleActions / footer; title art spans any width
- C: shared Story canvas grid (--sw-story-canvas) behind the SW Header work area and dropdown room
- D: SWViewerButton tone="green" for 전체 켜기 / 전체 끄기: default kept, hover = primary (확인) hover
  token, pressed = primary face
- AI guide, verification scripts (76 checks, element regression) and evidence updated

src/sw/sw-viewer-stories.css

@@ -5,10 +5,7 @@
   position: relative;
   flex: 1;
   min-height: 0;
-  background:
-    linear-gradient(rgba(38, 102, 81, 0.18) 1px, transparent 1px) 0 0 / 40px 40px,
-    linear-gradient(90deg, rgba(38, 102, 81, 0.18) 1px, transparent 1px) 0 0 / 40px 40px,
-    #0a0a0b;
+  background: var(--sw-story-canvas);
 }
 .sw-viewer-story-room { padding-bottom: 320px; }
 .sw-viewer-story-toolbar { display: flex; flex-wrap: wrap; align-items: center; justify-content: flex-end; gap: 12px 4px; }