feat: Document UI for directive orchestration with Lexical editor (#93)

* WIP: heartbeat checkpoint

* feat: soryu-co/soryu - makima: Save previous goal on update and include history in re-planning prompt

* feat: soryu-co/soryu - makima: Install Lexical and create base document editor component

* feat: soryu-co/soryu - makima: Create directive file system sidebar and document layout

* feat: soryu-co/soryu - makima: Create custom Lexical step diagram block

* feat: soryu-co/soryu - makima: Add context menu and goal auto-update integration

* WIP: heartbeat checkpoint

1 files changed, 360 insertions, 0 deletions

diff --git a/frontend/src/components/document/nodes/StepsDiagram.css b/frontend/src/components/document/nodes/StepsDiagram.css
new file mode 100644
index 0000000..f3e9305
--- /dev/null
+++ b/frontend/src/components/document/nodes/StepsDiagram.css
@@ -0,0 +1,360 @@
+/* ============================================
+   Steps Diagram Block
+   ============================================ */
+
+.steps-diagram-block {
+  margin: 1.5rem 0;
+  user-select: none;
+}
+
+.steps-diagram {
+  background: #f8f9fc;
+  border: 1px solid #e2e5ef;
+  border-radius: 10px;
+  padding: 1rem 1.25rem;
+  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
+  font-size: 14px;
+  color: #374151;
+}
+
+/* ---- Header ---- */
+.steps-diagram-header {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  margin-bottom: 1rem;
+  padding-bottom: 0.6rem;
+  border-bottom: 1px solid #e5e7eb;
+}
+
+.steps-diagram-header-left {
+  display: flex;
+  align-items: center;
+  gap: 0.75rem;
+}
+
+.steps-diagram-header-title {
+  font-weight: 600;
+  font-size: 0.9rem;
+  color: #1f2937;
+  letter-spacing: 0.01em;
+}
+
+.steps-diagram-header-count {
+  font-size: 0.78rem;
+  color: #6b7280;
+  background: #e5e7eb;
+  border-radius: 10px;
+  padding: 0.15rem 0.55rem;
+}
+
+.steps-diagram-header-author {
+  font-size: 0.72rem;
+  color: #9ca3af;
+  font-style: italic;
+}
+
+/* ---- DAG Layout ---- */
+.steps-diagram-dag {
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  gap: 0;
+}
+
+.steps-diagram-group {
+  display: flex;
+  flex-wrap: wrap;
+  gap: 0.6rem;
+  justify-content: center;
+  width: 100%;
+}
+
+/* ---- Arrow between groups ---- */
+.steps-diagram-arrow {
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  padding: 0.15rem 0;
+}
+
+.steps-diagram-arrow-line {
+  width: 2px;
+  height: 16px;
+  background: #cbd5e1;
+}
+
+.steps-diagram-arrow-head {
+  width: 0;
+  height: 0;
+  border-left: 5px solid transparent;
+  border-right: 5px solid transparent;
+  border-top: 6px solid #cbd5e1;
+}
+
+/* ---- Step Card ---- */
+.steps-diagram-card {
+  flex: 1 1 180px;
+  max-width: 280px;
+  background: #ffffff;
+  border: 1px solid #e5e7eb;
+  border-radius: 8px;
+  padding: 0.65rem 0.8rem;
+  transition: box-shadow 0.2s ease, border-color 0.2s ease;
+  animation: stepCardAppear 0.35s ease-out both;
+}
+
+@keyframes stepCardAppear {
+  from {
+    opacity: 0;
+    transform: translateY(8px) scale(0.97);
+  }
+  to {
+    opacity: 1;
+    transform: translateY(0) scale(1);
+  }
+}
+
+.steps-diagram-card:hover {
+  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
+}
+
+.steps-diagram-card-header {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  gap: 0.5rem;
+  margin-bottom: 0.3rem;
+}
+
+.steps-diagram-card-name {
+  font-weight: 600;
+  font-size: 0.85rem;
+  color: #1f2937;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+  flex: 1;
+}
+
+.steps-diagram-card-desc {
+  font-size: 0.78rem;
+  color: #6b7280;
+  margin: 0.2rem 0 0.4rem 0;
+  line-height: 1.4;
+  display: -webkit-box;
+  -webkit-line-clamp: 2;
+  -webkit-box-orient: vertical;
+  overflow: hidden;
+}
+
+.steps-diagram-card-footer {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  font-size: 0.72rem;
+  color: #9ca3af;
+}
+
+.steps-diagram-card-index {
+  font-weight: 500;
+}
+
+.steps-diagram-card-progress {
+  color: #d97706;
+  font-style: italic;
+}
+
+.steps-diagram-card-time {
+  color: #6b7280;
+}
+
+/* ---- Status Badge ---- */
+.steps-diagram-status-badge {
+  font-size: 0.68rem;
+  font-weight: 600;
+  text-transform: uppercase;
+  letter-spacing: 0.03em;
+  padding: 0.12rem 0.45rem;
+  border-radius: 9px;
+  white-space: nowrap;
+  flex-shrink: 0;
+}
+
+.steps-diagram-status-badge--pending {
+  background: #f3f4f6;
+  color: #6b7280;
+}
+
+.steps-diagram-status-badge--ready {
+  background: #dbeafe;
+  color: #2563eb;
+}
+
+.steps-diagram-status-badge--running {
+  background: #fef3c7;
+  color: #d97706;
+  animation: statusPulse 2s ease-in-out infinite;
+}
+
+.steps-diagram-status-badge--completed {
+  background: #d1fae5;
+  color: #059669;
+}
+
+.steps-diagram-status-badge--failed {
+  background: #fee2e2;
+  color: #dc2626;
+}
+
+.steps-diagram-status-badge--skipped {
+  background: repeating-linear-gradient(
+    45deg,
+    #f3f4f6,
+    #f3f4f6 4px,
+    #e5e7eb 4px,
+    #e5e7eb 8px
+  );
+  color: #9ca3af;
+}
+
+/* ---- Status-specific Card Borders ---- */
+.steps-diagram-card--pending {
+  border-left: 3px solid #d1d5db;
+}
+
+.steps-diagram-card--ready {
+  border-left: 3px solid #3b82f6;
+}
+
+.steps-diagram-card--running {
+  border-left: 3px solid #f59e0b;
+  animation: cardGlow 2s ease-in-out infinite;
+}
+
+.steps-diagram-card--completed {
+  border-left: 3px solid #10b981;
+}
+
+.steps-diagram-card--failed {
+  border-left: 3px solid #ef4444;
+}
+
+.steps-diagram-card--skipped {
+  border-left: 3px solid #d1d5db;
+  opacity: 0.7;
+}
+
+/* ---- Animations ---- */
+@keyframes statusPulse {
+  0%, 100% {
+    opacity: 1;
+  }
+  50% {
+    opacity: 0.65;
+  }
+}
+
+@keyframes cardGlow {
+  0%, 100% {
+    box-shadow: 0 0 0 0 rgba(245, 158, 11, 0);
+  }
+  50% {
+    box-shadow: 0 0 8px 2px rgba(245, 158, 11, 0.15);
+  }
+}
+
+/* ---- Loading State ---- */
+.steps-diagram-loading {
+  display: flex;
+  align-items: center;
+  gap: 0.6rem;
+  padding: 1rem 0;
+  color: #9ca3af;
+  font-size: 0.85rem;
+}
+
+.steps-diagram-spinner {
+  width: 16px;
+  height: 16px;
+  border: 2px solid #e5e7eb;
+  border-top-color: #6b7280;
+  border-radius: 50%;
+  animation: spin 0.8s linear infinite;
+}
+
+@keyframes spin {
+  to { transform: rotate(360deg); }
+}
+
+/* ---- Planning State ---- */
+.steps-diagram-planning {
+  display: flex;
+  align-items: center;
+  gap: 0.75rem;
+  padding: 1.25rem 0;
+  color: #6b7280;
+  font-size: 0.85rem;
+  font-style: italic;
+}
+
+.steps-diagram-planning-dots {
+  display: flex;
+  gap: 4px;
+}
+
+.steps-diagram-planning-dots span {
+  width: 6px;
+  height: 6px;
+  background: #9ca3af;
+  border-radius: 50%;
+  animation: dotBounce 1.4s ease-in-out infinite;
+}
+
+.steps-diagram-planning-dots span:nth-child(2) {
+  animation-delay: 0.2s;
+}
+
+.steps-diagram-planning-dots span:nth-child(3) {
+  animation-delay: 0.4s;
+}
+
+@keyframes dotBounce {
+  0%, 80%, 100% {
+    transform: scale(0.6);
+    opacity: 0.4;
+  }
+  40% {
+    transform: scale(1);
+    opacity: 1;
+  }
+}
+
+/* ---- Empty / Error ---- */
+.steps-diagram-empty {
+  padding: 1rem 0;
+  color: #9ca3af;
+  font-size: 0.85rem;
+  text-align: center;
+}
+
+.steps-diagram-error {
+  padding: 0.75rem;
+  background: #fef2f2;
+  border: 1px solid #fecaca;
+  border-radius: 6px;
+  color: #dc2626;
+  font-size: 0.82rem;
+}
+
+/* ---- Responsive ---- */
+@media (max-width: 640px) {
+  .steps-diagram {
+    padding: 0.75rem;
+  }
+
+  .steps-diagram-card {
+    flex: 1 1 100%;
+    max-width: 100%;
+  }
+}