feat: Add compact mode to TaskGraph, use in pipeline tab

TaskGraph now accepts a `compact` prop that hides the second line
(category badge, priority) and uses tighter vertical padding. Blocked-by
count moves inline on the first line as "N deps". Pipeline phase cards
pass compact; the plan tab's phase detail keeps the full two-line layout.

apps/web/src/components/execution/TaskGraph.tsx

@@ -25,6 +25,8 @@ interface TaskGraphProps {
   agentNameMap: Map<string, string>;
   onClickTask: (taskId: string) => void;
   onDeleteTask?: (taskId: string) => void;
+  /** Hide category badge and priority — use in compact contexts like the pipeline */
+  compact?: boolean;
 }
 
 // ---------------------------------------------------------------------------
@@ -51,6 +53,7 @@ export function TaskGraph({
   agentNameMap,
   onClickTask,
   onDeleteTask,
+  compact = false,
 }: TaskGraphProps) {
   // Flatten task dep edges to DependencyEdge format for reuse of groupPhasesByDependencyLevel
   const columns = useMemo(() => {
@@ -112,6 +115,7 @@ export function TaskGraph({
                           ? () => onDeleteTask(task.id)
                           : undefined
                       }
+                      compact={compact}
                     />
                   ))}
                 </div>
@@ -127,6 +131,7 @@ export function TaskGraph({
                     ? () => onDeleteTask(col.phases[0].id)
                     : undefined
                 }
+                compact={compact}
               />
             )}
           </div>
@@ -146,12 +151,14 @@ function TaskNode({
   agentName,
   onClick,
   onDelete,
+  compact = false,
 }: {
   task: SerializedTask;
   blockedByCount: number;
   agentName?: string;
   onClick: () => void;
   onDelete?: () => void;
+  compact?: boolean;
 }) {
   const variant = mapEntityStatus(task.status);
   const catConfig = getCategoryConfig(task.category);
@@ -163,10 +170,14 @@ function TaskNode({
         ? "text-status-warning-fg"
         : null;
 
+  const hasSecondLine =
+    !compact && (true /* category badge always shows */ || priorityColor || agentName || blockedByCount > 0);
+
   return (
     <div
       className={cn(
-        "group flex w-full cursor-pointer gap-2 rounded-md px-2 py-1.5 text-left transition-all hover:bg-accent/50",
+        "group flex w-full cursor-pointer gap-2 rounded-md px-2 text-left transition-all hover:bg-accent/50",
+        compact ? "py-1" : "py-1.5",
       )}
       onClick={onClick}
     >
@@ -179,13 +190,18 @@ function TaskNode({
         )}
       />
 
-      {/* Two-line content */}
+      {/* Content */}
       <div className="min-w-0 flex-1">
-        {/* Line 1: name + status + delete */}
+        {/* Line 1: name + status + blocked count (compact) + delete */}
         <div className="flex items-center gap-2">
           <span className="min-w-0 flex-1 truncate text-[13px]">
             {task.name}
           </span>
+          {compact && blockedByCount > 0 && (
+            <span className="shrink-0 text-[10px] text-muted-foreground">
+              {blockedByCount} dep{blockedByCount === 1 ? "" : "s"}
+            </span>
+          )}
           <StatusBadge
             status={task.status}
             className="shrink-0 text-[9px]"
@@ -206,7 +222,8 @@ function TaskNode({
           )}
         </div>
 
-        {/* Line 2: category + priority + agent + blocked count */}
+        {/* Line 2: category + priority + agent + blocked count (full mode only) */}
+        {hasSecondLine && (
           <div className="mt-0.5 flex items-center gap-1.5">
             <Badge variant={catConfig.variant} size="xs">
               {catConfig.label}
@@ -227,6 +244,7 @@ function TaskNode({
               </span>
             )}
           </div>
+        )}
       </div>
     </div>
   );

apps/web/src/components/pipeline/PipelinePhaseGroup.tsx

@@ -141,6 +141,7 @@ export function PipelinePhaseGroup({ phase, tasks, taskDepsRaw, isBlocked, detai
             blockedByCountMap={blockedByCountMap}
             agentNameMap={emptyAgentMap}
             onClickTask={setSelectedTaskId}
+            compact
           />
         )}
       </div>