fix: persist group description with Ctrl+S, not just on blur

The description field committed to the store only on textarea blur, so
saving via Ctrl+S (the primary shortcut, which never blurs the field)
dropped the edit. Make it controlled and commit on each change; snapshot
history once per edit session (on focus) so undo stays a single step.

ha-relevant: yes

frontend/src/components/panels/DetailPanel.tsx

@@ -1,4 +1,4 @@
-import { createElement, useState } from 'react'
+import { createElement, useRef, useState } from 'react'
 import { X, Edit, Trash2, ExternalLink, Plus, Pencil, Layers, Ungroup, Eye, EyeOff } from 'lucide-react'
 import { Button } from '@/components/ui/button'
 import { Input } from '@/components/ui/input'
@@ -66,10 +66,8 @@ export function DetailPanel({ onEdit }: DetailPanelProps) {
         nodes={nodes}
         onUngroup={() => { ungroup(node.id) }}
         onRemoveChild={(id) => { snapshotHistory(); removeFromGroup(node.id, id) }}
-        onChangeDescription={(value) => {
-          snapshotHistory()
-          updateNode(node.id, { notes: value })
-        }}
+        onChangeDescription={(value) => updateNode(node.id, { notes: value })}
+        onSnapshotBeforeEdit={snapshotHistory}
         onToggleBorder={() => {
           snapshotHistory()
           updateNode(node.id, {
@@ -433,22 +431,28 @@ interface GroupDetailPanelProps {
   onUngroup: () => void
   onRemoveChild: (id: string) => void
   onChangeDescription: (value: string) => void
+  onSnapshotBeforeEdit: () => void
   onToggleBorder: () => void
   onClose: () => void
   onSelectChild: (id: string) => void
 }
 
-function GroupDetailPanel({ node, nodes, onUngroup, onRemoveChild, onChangeDescription, onToggleBorder, onClose, onSelectChild }: GroupDetailPanelProps) {
+function GroupDetailPanel({ node, nodes, onUngroup, onRemoveChild, onChangeDescription, onSnapshotBeforeEdit, onToggleBorder, onClose, onSelectChild }: GroupDetailPanelProps) {
   const children = nodes.filter((n) => n.parentId === node.id)
   const onlineCount = children.filter((n) => n.data.status === 'online').length
   const offlineCount = children.filter((n) => n.data.status === 'offline').length
   const showBorder = node.data.custom_colors?.show_border !== false
 
   // Description reuses data.notes, which already round-trips to the backend.
-  // Uncontrolled textarea (keyed by node id) so we only snapshot history on blur,
-  // not on every keystroke. `key` resets the field when switching groups.
-  const commitDescription = (value: string) => {
-    if (value === (node.data.notes ?? '')) return
+  // Controlled + committed on every keystroke so ANY save path (incl. Ctrl+S,
+  // which never blurs the field) captures it. History is snapshotted once at the
+  // start of an edit session so the whole edit is a single undo step.
+  const snappedRef = useRef(false)
+  const handleDescriptionChange = (value: string) => {
+    if (!snappedRef.current) {
+      onSnapshotBeforeEdit()
+      snappedRef.current = true
+    }
     onChangeDescription(value)
   }
 
@@ -484,9 +488,9 @@ function GroupDetailPanel({ node, nodes, onUngroup, onRemoveChild, onChangeDescr
         </label>
         <textarea
           id="group-description"
-          key={node.id}
-          defaultValue={node.data.notes ?? ''}
-          onBlur={(e) => commitDescription(e.target.value)}
+          value={node.data.notes ?? ''}
+          onFocus={() => { snappedRef.current = false }}
+          onChange={(e) => handleDescriptionChange(e.target.value)}
           placeholder="Add a description for this group…"
           rows={3}
           className="mt-1.5 w-full resize-y rounded-md bg-[#21262d] border border-[#30363d] px-2 py-1.5 text-xs text-foreground placeholder:text-muted-foreground/40 focus:outline-none focus:border-[#00d4ff]/50"

frontend/src/components/panels/__tests__/GroupPanels.test.tsx

@@ -252,24 +252,25 @@ describe('GroupDetailPanel', () => {
     expect((screen.getByLabelText('Description') as HTMLTextAreaElement).value).toBe('Critical DMZ hosts')
   })
 
-  it('commits the description on blur', () => {
+  it('commits the description to the store on each change (so Ctrl+S captures it)', () => {
+    const updateNode = vi.fn()
+    const group = makeGroupNode()
+    setupStore({ nodes: [group], selectedNodeId: 'g1', selectedNodeIds: ['g1'], updateNode })
+    renderPanel()
+    fireEvent.change(screen.getByLabelText('Description'), { target: { value: 'New notes' } })
+    expect(updateNode).toHaveBeenCalledWith('g1', { notes: 'New notes' })
+  })
+
+  it('snapshots history once at the start of an edit, not on every keystroke', () => {
     const updateNode = vi.fn()
     const snapshotHistory = vi.fn()
     const group = makeGroupNode()
     setupStore({ nodes: [group], selectedNodeId: 'g1', selectedNodeIds: ['g1'], updateNode, snapshotHistory })
     renderPanel()
     const textarea = screen.getByLabelText('Description')
-    fireEvent.change(textarea, { target: { value: 'New notes' } })
-    fireEvent.blur(textarea)
-    expect(updateNode).toHaveBeenCalledWith('g1', { notes: 'New notes' })
-  })
-
-  it('does not commit the description on blur when unchanged', () => {
-    const updateNode = vi.fn()
-    const group = makeGroupNode()
-    setupStore({ nodes: [group], selectedNodeId: 'g1', selectedNodeIds: ['g1'], updateNode })
-    renderPanel()
-    fireEvent.blur(screen.getByLabelText('Description'))
-    expect(updateNode).not.toHaveBeenCalled()
+    fireEvent.change(textarea, { target: { value: 'a' } })
+    fireEvent.change(textarea, { target: { value: 'ab' } })
+    fireEvent.change(textarea, { target: { value: 'abc' } })
+    expect(snapshotHistory).toHaveBeenCalledTimes(1)
   })
 })