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, 76 insertions, 0 deletions

diff --git a/frontend/src/components/document/DocumentSettings.tsx b/frontend/src/components/document/DocumentSettings.tsx
new file mode 100644
index 0000000..b575b3d
--- /dev/null
+++ b/frontend/src/components/document/DocumentSettings.tsx
@@ -0,0 +1,76 @@
+import { useState, useCallback } from 'react'
+import { upsertUserSetting } from '../../services/directiveApi'
+
+interface DocumentSettingsProps {
+  isOpen: boolean
+  onClose: () => void
+  enabled: boolean
+  onToggle: (enabled: boolean) => void
+}
+
+export default function DocumentSettings({
+  isOpen,
+  onClose,
+  enabled,
+  onToggle,
+}: DocumentSettingsProps) {
+  const [saving, setSaving] = useState(false)
+
+  const handleToggle = useCallback(async () => {
+    const newValue = !enabled
+    setSaving(true)
+    try {
+      // Update localStorage immediately for instant UI response
+      localStorage.setItem('document_ui_enabled', JSON.stringify(newValue))
+      onToggle(newValue)
+
+      // Persist to backend
+      await upsertUserSetting('document_ui_enabled', newValue)
+    } catch (err) {
+      console.error('Failed to save document UI setting:', err)
+      // Revert on failure
+      localStorage.setItem('document_ui_enabled', JSON.stringify(!newValue))
+      onToggle(!newValue)
+    } finally {
+      setSaving(false)
+    }
+  }, [enabled, onToggle])
+
+  if (!isOpen) return null
+
+  return (
+    <div className="modal-overlay" onClick={onClose}>
+      <div className="config-modal" onClick={(e) => e.stopPropagation()}>
+        <div className="modal-header">
+          <h2>Document UI Settings</h2>
+          <button className="close-btn" onClick={onClose}>{'\u00D7'}</button>
+        </div>
+
+        <div className="modal-content">
+          <div className="config-option">
+            <label className="config-label" style={{ cursor: 'pointer' }}>
+              <input
+                type="checkbox"
+                checked={enabled}
+                onChange={handleToggle}
+                disabled={saving}
+                className="config-checkbox"
+              />
+              <span className="config-text">
+                Enable Document UI (Experimental)
+              </span>
+            </label>
+            <div className="config-description">
+              Replace the directive management interface with an interactive
+              document editor. This is a proof of concept.
+            </div>
+          </div>
+        </div>
+
+        <div className="modal-footer">
+          <button className="modal-btn" onClick={onClose}>Close</button>
+        </div>
+      </div>
+    </div>
+  )
+}