fix(dashboard): noCompactor + note edit/preview toggle + widget border

- dashboard-grid: add noCompactor to prevent auto-compaction on drag
- note-widget: edit/preview toggle button (pencil icon), isEditing state,
  hideToolbar in preview mode
- widget-wrapper: border-primary/20 accent border
- dashboard-store: console.error on widget add/remove/layout-save failures

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

apps/web/src/components/dashboard/dashboard-grid.tsx

@@ -1,7 +1,7 @@
 'use client';
 
 import { useEffect, useRef, useState } from 'react';
-import { Responsive } from 'react-grid-layout';
+import { Responsive, noCompactor } from 'react-grid-layout';
 import type { ResponsiveLayouts } from 'react-grid-layout';
 import 'react-grid-layout/css/styles.css';
 import 'react-resizable/css/styles.css';
@@ -97,6 +97,7 @@ export function DashboardGrid({
         resizeConfig={{
           enabled: isEditMode,
         }}
+        compactor={noCompactor}
         onLayoutChange={(_currentLayout, allLayouts) => onLayoutChange(allLayouts)}
       >
         {widgets.map((widget) => {

apps/web/src/components/dashboard/widgets/note-widget.tsx

@@ -9,10 +9,6 @@ import { updateWidgetConfig } from '@/lib/dashboard-api';
 
 const DEBOUNCE_MS = 1500;
 
-/**
- * Compact toolbar commands (D-16).
- * Bold, Italic, Strikethrough, divider, Unordered List, Checkbox, divider, Link, Code
- */
 const NOTE_COMMANDS = [
   commands.bold,
   commands.italic,
@@ -25,12 +21,6 @@ const NOTE_COMMANDS = [
   commands.code,
 ];
 
-/**
- * Notes widget (DASH-06, D-16/D-17/D-18).
- * Markdown editor with compact toolbar and debounced autosave.
- * Uses AbortController to cancel in-flight requests before issuing new ones (Pitfall 7).
- * rehype-sanitize is enabled for XSS prevention (T-05-05).
- */
 export function NoteWidget({ instanceId, config }: WidgetProps) {
   const t = useTranslations('widgets');
   const [title, setTitle] = useState<string>(
@@ -39,12 +29,12 @@ export function NoteWidget({ instanceId, config }: WidgetProps) {
   const [content, setContent] = useState<string>(
     (config.content as string) || '',
   );
+  const [isEditing, setIsEditing] = useState(false);
   const [saveError, setSaveError] = useState(false);
 
   const timerRef = useRef<ReturnType<typeof setTimeout> | undefined>(undefined);
   const abortRef = useRef<AbortController | undefined>(undefined);
 
-  // Cleanup on unmount
   useEffect(() => {
     return () => {
       clearTimeout(timerRef.current);
@@ -54,21 +44,13 @@ export function NoteWidget({ instanceId, config }: WidgetProps) {
 
   const save = useCallback(
     async (newContent: string, newTitle: string) => {
-      // Abort any in-flight request (Pitfall 7)
       abortRef.current?.abort();
       abortRef.current = new AbortController();
-
       try {
-        await updateWidgetConfig(instanceId, {
-          content: newContent,
-          title: newTitle,
-        }, abortRef.current.signal);
+        await updateWidgetConfig(instanceId, { content: newContent, title: newTitle }, abortRef.current.signal);
         setSaveError(false);
       } catch (err: unknown) {
-        // AbortError is expected — swallow it
-        if (err instanceof DOMException && err.name === 'AbortError') {
-          return;
-        }
+        if (err instanceof DOMException && err.name === 'AbortError') return;
         setSaveError(true);
       }
     },
@@ -78,9 +60,7 @@ export function NoteWidget({ instanceId, config }: WidgetProps) {
   const scheduleSave = useCallback(
     (newContent: string, newTitle: string) => {
       clearTimeout(timerRef.current);
-      timerRef.current = setTimeout(() => {
-        save(newContent, newTitle);
-      }, DEBOUNCE_MS);
+      timerRef.current = setTimeout(() => save(newContent, newTitle), DEBOUNCE_MS);
     },
     [save],
   );
@@ -105,32 +85,52 @@ export function NoteWidget({ instanceId, config }: WidgetProps) {
 
   return (
     <div className="flex h-full flex-col overflow-hidden" data-color-mode="auto">
-      {/* Editable title (D-17, Body 14px weight 600) */}
-      <div className="relative flex items-center border-b border-border px-3 py-1.5">
+      {/* Header: title + pencil toggle */}
+      <div className="relative flex items-center border-b border-border px-3 py-1.5 gap-2">
         <input
           type="text"
-          className="w-full bg-transparent text-sm font-semibold text-foreground outline-none placeholder:text-muted-foreground"
+          className="flex-1 bg-transparent text-sm font-semibold text-foreground outline-none placeholder:text-muted-foreground"
           value={title}
           onChange={handleTitleChange}
           placeholder={t('note.defaultTitle')}
         />
-        {/* Autosave error indicator (small red dot top-right) */}
         {saveError && (
           <span
-            className="absolute right-2 top-1/2 h-2 w-2 -translate-y-1/2 rounded-full bg-destructive"
+            className="h-2 w-2 shrink-0 rounded-full bg-destructive"
             title={t('note.autosaveError')}
           />
         )}
+        <button
+          onClick={() => setIsEditing((v) => !v)}
+          className={`flex h-6 w-6 shrink-0 items-center justify-center rounded transition-colors hover:bg-muted ${isEditing ? 'text-destructive' : 'text-muted-foreground'}`}
+          title={isEditing ? t('note.viewMode') : t('note.editMode')}
+        >
+          <svg
+            xmlns="http://www.w3.org/2000/svg"
+            width="14"
+            height="14"
+            viewBox="0 0 24 24"
+            fill="none"
+            stroke="currentColor"
+            strokeWidth="2"
+            strokeLinecap="round"
+            strokeLinejoin="round"
+          >
+            <path d="M11 4H4a2 2 0 0 0-2 2v14a2 2 0 0 0 2 2h14a2 2 0 0 0 2-2v-7" />
+            <path d="M18.5 2.5a2.121 2.121 0 0 1 3 3L12 15l-4 1 1-4 9.5-9.5z" />
+          </svg>
+        </button>
       </div>
 
-      {/* Markdown editor (D-16, D-18) */}
+      {/* Content: preview or editor */}
       <div className="flex-1 overflow-auto">
         <MDEditor
           data-testid="md-editor"
           value={content}
-          onChange={handleContentChange}
+          onChange={isEditing ? handleContentChange : undefined}
           commands={NOTE_COMMANDS}
-          preview="edit"
+          preview={isEditing ? 'edit' : 'preview'}
+          hideToolbar={!isEditing}
           height="100%"
           visibleDragbar={false}
           previewOptions={{

apps/web/src/components/dashboard/widgets/widget-wrapper.tsx

@@ -25,7 +25,7 @@ export function WidgetWrapper({ widget, isEditMode, onRemove }: WidgetWrapperPro
 
   return (
     <div
-      className="relative h-full w-full overflow-hidden rounded-lg border bg-card shadow-sm"
+      className="relative h-full w-full overflow-hidden rounded-lg border border-primary/20 bg-card shadow-sm"
       data-widget-id={widget.id}
       role="article"
       aria-label={definition ? t(definition.nameKey) : widget.widgetType}