Add right-click context menu for contracts on contracts and board pages (#8)

Implement a reusable ContractContextMenu component that provides:
- Mark as Complete/Active/Archive status actions (conditionally shown)
- Go to Supervisor Task link (when supervisor exists)
- Delete action with confirmation

Integrate context menu into:
- ContractList.tsx on the contracts page
- WorkflowBoard on the workflow/board page via PhaseColumn and WorkflowContractCard

Features match ElementContextMenu patterns:
- Fixed positioning with z-50
- Click outside and Escape key close handlers
- Viewport overflow prevention
- Dark theme colors (#0a1628, #0d1b2d, #75aafc, #9bc3ff)

Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>

3 files changed, 61 insertions, 11 deletions

diff --git a/makima/frontend/src/components/workflow/PhaseColumn.tsx b/makima/frontend/src/components/workflow/PhaseColumn.tsx
index ddea85f..277b04c 100644
--- a/makima/frontend/src/components/workflow/PhaseColumn.tsx
+++ b/makima/frontend/src/components/workflow/PhaseColumn.tsx
@@ -7,6 +7,7 @@ interface PhaseColumnProps {
   contracts: ContractSummary[];
   onContractClick: (contractId: string) => void;
   onDrop: (contractId: string, phase: ContractPhase) => void;
+  onContextMenu?: (e: React.MouseEvent, contract: ContractSummary) => void;
 }
 
 const phaseConfig: Record<
@@ -50,6 +51,7 @@ export function PhaseColumn({
   contracts,
   onContractClick,
   onDrop,
+  onContextMenu,
 }: PhaseColumnProps) {
   const [isDragOver, setIsDragOver] = useState(false);
   const config = phaseConfig[phase];
@@ -114,6 +116,7 @@ export function PhaseColumn({
                 e.dataTransfer.setData("contractId", contract.id);
                 e.dataTransfer.effectAllowed = "move";
               }}
+              onContextMenu={onContextMenu ? (e) => onContextMenu(e, contract) : undefined}
             />
           ))
         )}
diff --git a/makima/frontend/src/components/workflow/WorkflowBoard.tsx b/makima/frontend/src/components/workflow/WorkflowBoard.tsx
index af4aec7..e36ca21 100644
--- a/makima/frontend/src/components/workflow/WorkflowBoard.tsx
+++ b/makima/frontend/src/components/workflow/WorkflowBoard.tsx
@@ -1,11 +1,17 @@
-import { useMemo } from "react";
+import { useMemo, useState } from "react";
 import type { ContractSummary, ContractPhase } from "../../lib/api";
 import { PhaseColumn } from "./PhaseColumn";
+import { ContractContextMenu } from "../contracts/ContractContextMenu";
 
 interface WorkflowBoardProps {
   contracts: ContractSummary[];
   onContractClick: (contractId: string) => void;
   onPhaseChange: (contractId: string, newPhase: ContractPhase) => void;
+  onMarkComplete?: (contract: ContractSummary) => void;
+  onMarkActive?: (contract: ContractSummary) => void;
+  onArchive?: (contract: ContractSummary) => void;
+  onDelete?: (contract: ContractSummary) => void;
+  onGoToSupervisor?: (contract: ContractSummary) => void;
 }
 
 const phases: ContractPhase[] = ["research", "specify", "plan", "execute", "review"];
@@ -14,7 +20,27 @@ export function WorkflowBoard({
   contracts,
   onContractClick,
   onPhaseChange,
+  onMarkComplete,
+  onMarkActive,
+  onArchive,
+  onDelete,
+  onGoToSupervisor,
 }: WorkflowBoardProps) {
+  const [contextMenuPosition, setContextMenuPosition] = useState<{ x: number; y: number } | null>(null);
+  const [contextMenuContract, setContextMenuContract] = useState<ContractSummary | null>(null);
+
+  const handleContextMenu = (e: React.MouseEvent, contract: ContractSummary) => {
+    e.preventDefault();
+    e.stopPropagation(); // Prevent interference with drag-and-drop
+    setContextMenuPosition({ x: e.clientX, y: e.clientY });
+    setContextMenuContract(contract);
+  };
+
+  const closeContextMenu = () => {
+    setContextMenuPosition(null);
+    setContextMenuContract(null);
+  };
+
   // Group contracts by phase
   const contractsByPhase = useMemo(() => {
     const grouped: Record<ContractPhase, ContractSummary[]> = {
@@ -39,16 +65,34 @@ export function WorkflowBoard({
   }, [contracts]);
 
   return (
-    <div className="flex gap-2 h-full overflow-x-auto">
-      {phases.map((phase) => (
-        <PhaseColumn
-          key={phase}
-          phase={phase}
-          contracts={contractsByPhase[phase]}
-          onContractClick={onContractClick}
-          onDrop={onPhaseChange}
+    <>
+      <div className="flex gap-2 h-full overflow-x-auto">
+        {phases.map((phase) => (
+          <PhaseColumn
+            key={phase}
+            phase={phase}
+            contracts={contractsByPhase[phase]}
+            onContractClick={onContractClick}
+            onDrop={onPhaseChange}
+            onContextMenu={handleContextMenu}
+          />
+        ))}
+      </div>
+
+      {/* Context Menu */}
+      {contextMenuPosition && contextMenuContract && (
+        <ContractContextMenu
+          x={contextMenuPosition.x}
+          y={contextMenuPosition.y}
+          contract={contextMenuContract}
+          onClose={closeContextMenu}
+          onMarkComplete={() => onMarkComplete?.(contextMenuContract)}
+          onMarkActive={() => onMarkActive?.(contextMenuContract)}
+          onArchive={() => onArchive?.(contextMenuContract)}
+          onDelete={() => onDelete?.(contextMenuContract)}
+          onGoToSupervisor={() => onGoToSupervisor?.(contextMenuContract)}
         />
-      ))}
-    </div>
+      )}
+    </>
   );
 }
diff --git a/makima/frontend/src/components/workflow/WorkflowContractCard.tsx b/makima/frontend/src/components/workflow/WorkflowContractCard.tsx
index 61e6d17..86fcd13 100644
--- a/makima/frontend/src/components/workflow/WorkflowContractCard.tsx
+++ b/makima/frontend/src/components/workflow/WorkflowContractCard.tsx
@@ -5,6 +5,7 @@ interface WorkflowContractCardProps {
   contract: ContractSummary;
   onClick: () => void;
   onDragStart: (e: React.DragEvent) => void;
+  onContextMenu?: (e: React.MouseEvent) => void;
 }
 
 const statusConfig: Record<ContractStatus, { label: string; color: string }> = {
@@ -17,6 +18,7 @@ export function WorkflowContractCard({
   contract,
   onClick,
   onDragStart,
+  onContextMenu,
 }: WorkflowContractCardProps) {
   const navigate = useNavigate();
   const status = statusConfig[contract.status] || statusConfig.active;
@@ -33,6 +35,7 @@ export function WorkflowContractCard({
       draggable
       onDragStart={onDragStart}
       onClick={onClick}
+      onContextMenu={onContextMenu}
       className="p-3 bg-[rgba(9,13,20,0.8)] border border-[rgba(117,170,252,0.2)] hover:border-[rgba(117,170,252,0.4)] cursor-pointer transition-colors select-none"
     >
       {/* Header row with name and supervisor button */}