chore: mark US-030 as complete and update progress log

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

prd.json

@@ -533,7 +533,7 @@
         "Verify in browser using dev-browser skill"
       ],
       "priority": 30,
-      "passes": false,
+      "passes": true,
       "notes": ""
     },
     {

progress.txt

@@ -433,3 +433,17 @@
   - onEdgesDelete is useful for additional logic like logging, dirty state tracking, or undo/redo
   - Edge selection shows visual highlight via React Flow's built-in styling
 ---
+
+## 2026-01-22 - US-030
+- What was implemented: Right-click context menu for canvas, nodes, and edges
+- Files changed:
+  - src/components/editor/ContextMenu.tsx - new component with menu items for different contexts (canvas/node/edge)
+  - src/app/editor/[projectId]/FlowchartEditor.tsx - integrated context menu with handlers for all actions
+- **Learnings for future iterations:**
+  - Use `onPaneContextMenu`, `onNodeContextMenu`, and `onEdgeContextMenu` React Flow callbacks for context menus
+  - `screenToFlowPosition()` converts screen coordinates to flow coordinates for placing nodes at click position
+  - Context menu state includes type ('canvas'|'node'|'edge') and optional nodeId/edgeId for targeted actions
+  - Use `document.addEventListener('click', handler)` and `e.stopPropagation()` on menu to close on outside click
+  - Escape key listener via `document.addEventListener('keydown', handler)` for menu close
+  - NodeMouseHandler and EdgeMouseHandler types from reactflow provide proper typing for context menu callbacks
+---