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>

5 files changed, 261 insertions, 11 deletions

diff --git a/makima/frontend/src/components/contracts/ContractContextMenu.tsx b/makima/frontend/src/components/contracts/ContractContextMenu.tsx
new file mode 100644
index 0000000..f31beb5
--- /dev/null
+++ b/makima/frontend/src/components/contracts/ContractContextMenu.tsx
@@ -0,0 +1,160 @@
+import { useEffect, useRef } from "react";
+import type { ContractSummary } from "../../lib/api";
+
+interface ContractContextMenuProps {
+  x: number;
+  y: number;
+  contract: ContractSummary;
+  onClose: () => void;
+  onMarkComplete: () => void;
+  onMarkActive: () => void;
+  onArchive: () => void;
+  onDelete: () => void;
+  onGoToSupervisor: () => void;
+}
+
+export function ContractContextMenu({
+  x,
+  y,
+  contract,
+  onClose,
+  onMarkComplete,
+  onMarkActive,
+  onArchive,
+  onDelete,
+  onGoToSupervisor,
+}: ContractContextMenuProps) {
+  const menuRef = useRef<HTMLDivElement>(null);
+
+  // Close on click outside
+  useEffect(() => {
+    const handleClickOutside = (e: MouseEvent) => {
+      if (menuRef.current && !menuRef.current.contains(e.target as Node)) {
+        onClose();
+      }
+    };
+
+    const handleKeyDown = (e: KeyboardEvent) => {
+      if (e.key === "Escape") {
+        onClose();
+      }
+    };
+
+    document.addEventListener("mousedown", handleClickOutside);
+    document.addEventListener("keydown", handleKeyDown);
+
+    return () => {
+      document.removeEventListener("mousedown", handleClickOutside);
+      document.removeEventListener("keydown", handleKeyDown);
+    };
+  }, [onClose]);
+
+  // Adjust position if menu would overflow viewport
+  useEffect(() => {
+    if (menuRef.current) {
+      const rect = menuRef.current.getBoundingClientRect();
+      const viewportWidth = window.innerWidth;
+      const viewportHeight = window.innerHeight;
+
+      if (rect.right > viewportWidth) {
+        menuRef.current.style.left = `${x - rect.width}px`;
+      }
+      if (rect.bottom > viewportHeight) {
+        menuRef.current.style.top = `${y - rect.height}px`;
+      }
+    }
+  }, [x, y]);
+
+  const menuItemClass =
+    "w-full px-3 py-1.5 text-left text-xs font-mono text-[#9bc3ff] hover:bg-[rgba(117,170,252,0.1)] flex items-center gap-2";
+  const dividerClass = "border-t border-[rgba(117,170,252,0.2)] my-1";
+
+  const showMarkComplete = contract.status !== "completed";
+  const showMarkActive = contract.status !== "active";
+  const showArchive = contract.status !== "archived";
+  const showGoToSupervisor = !!contract.supervisorTaskId;
+
+  return (
+    <div
+      ref={menuRef}
+      className="fixed z-50 bg-[#0a1628] border border-[rgba(117,170,252,0.3)] shadow-lg min-w-[180px]"
+      style={{ left: x, top: y }}
+    >
+      {/* Header showing contract name */}
+      <div className="px-3 py-1.5 text-[10px] font-mono text-[#555] uppercase border-b border-[rgba(117,170,252,0.2)] truncate max-w-[200px]">
+        {contract.name}
+      </div>
+
+      {/* Status actions */}
+      {showMarkComplete && (
+        <button
+          className={menuItemClass}
+          onClick={() => {
+            onMarkComplete();
+            onClose();
+          }}
+        >
+          <span className="text-[#75aafc]">✓</span>
+          Mark as Complete
+        </button>
+      )}
+
+      {showMarkActive && (
+        <button
+          className={menuItemClass}
+          onClick={() => {
+            onMarkActive();
+            onClose();
+          }}
+        >
+          <span className="text-[#75aafc]">●</span>
+          Mark as Active
+        </button>
+      )}
+
+      {showArchive && (
+        <button
+          className={menuItemClass}
+          onClick={() => {
+            onArchive();
+            onClose();
+          }}
+        >
+          <span className="text-[#75aafc]">▣</span>
+          Archive
+        </button>
+      )}
+
+      {/* Supervisor link */}
+      {showGoToSupervisor && (
+        <>
+          <div className={dividerClass} />
+          <button
+            className={menuItemClass}
+            onClick={() => {
+              onGoToSupervisor();
+              onClose();
+            }}
+          >
+            <span className="text-[#75aafc]">▶</span>
+            Go to Supervisor Task
+          </button>
+        </>
+      )}
+
+      <div className={dividerClass} />
+
+      {/* Delete action */}
+      <button
+        className={`${menuItemClass} text-red-400 hover:bg-red-400/10`}
+        onClick={() => {
+          onDelete();
+          onClose();
+        }}
+      >
+        <span className="text-red-400">✕</span>
+        Delete
+      </button>
+    </div>
+  );
+}
diff --git a/makima/frontend/src/components/contracts/ContractList.tsx b/makima/frontend/src/components/contracts/ContractList.tsx
index 3a7b163..ebde497 100644
--- a/makima/frontend/src/components/contracts/ContractList.tsx
+++ b/makima/frontend/src/components/contracts/ContractList.tsx
@@ -2,6 +2,7 @@ import { useState } from "react";
 import type { ContractSummary, ContractStatus } from "../../lib/api";
 import { PhaseBadge } from "./PhaseBadge";
 import { PhaseProgressBarCompact } from "./PhaseProgressBar";
+import { ContractContextMenu } from "./ContractContextMenu";
 
 interface ContractListProps {
   contracts: ContractSummary[];
@@ -9,6 +10,11 @@ interface ContractListProps {
   onSelect: (id: string) => void;
   onCreate: () => void;
   selectedId?: string;
+  onMarkComplete?: (contract: ContractSummary) => void;
+  onMarkActive?: (contract: ContractSummary) => void;
+  onArchive?: (contract: ContractSummary) => void;
+  onDelete?: (contract: ContractSummary) => void;
+  onGoToSupervisor?: (contract: ContractSummary) => void;
 }
 
 const statusColors: Record<ContractStatus, string> = {
@@ -23,8 +29,26 @@ export function ContractList({
   onSelect,
   onCreate,
   selectedId,
+  onMarkComplete,
+  onMarkActive,
+  onArchive,
+  onDelete,
+  onGoToSupervisor,
 }: ContractListProps) {
   const [filter, setFilter] = useState<ContractStatus | "all">("all");
+  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();
+    setContextMenuPosition({ x: e.clientX, y: e.clientY });
+    setContextMenuContract(contract);
+  };
+
+  const closeContextMenu = () => {
+    setContextMenuPosition(null);
+    setContextMenuContract(null);
+  };
 
   const filteredContracts =
     filter === "all"
@@ -92,6 +116,7 @@ export function ContractList({
               <button
                 key={contract.id}
                 onClick={() => onSelect(contract.id)}
+                onContextMenu={(e) => handleContextMenu(e, contract)}
                 className={`
                   w-full text-left p-4 transition-colors
                   ${
@@ -139,6 +164,21 @@ export function ContractList({
           </div>
         )}
       </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/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 */}