feat: redesign agents page (architectural-grid style), add image description, fix AI limits, remove dead code

- Redesign agents page with architectural-grid (8) design system:
  rounded-2xl cards, serif headings, motion tabs, dashed templates section
- Replace agent form popup with full-page detail view (SettingsView style)
  with dark planning card, section tooltips, and help button
- Hide advanced mode for slide/excalidraw generators
- Add 'describe images' action to contextual AI assistant
- Add copy button to action/resource preview with HTTP fallback
- Add delete history button to agent run log panel
- Increase AI word limit from 2000 to 5000 (reformulate + transform-markdown)
- Increase max steps slider from 25 to 50
- Fix image description error with clear model compatibility message
- Fix doubled execution count display in agent detail view
- Remove dead files: notes-list-view.tsx, notes-view-toggle.tsx
- Remove 'list' view mode from NotesViewMode type
- Add missing i18n keys (back, configuration, options, copy, cleared)

memento-note/app/api/ai/transform-markdown/route.ts

@@ -27,9 +27,9 @@ export async function POST(request: NextRequest) {
       )
     }
 
-    if (wordCount > 2000) {
+    if (wordCount > 5000) {
       return NextResponse.json(
-        { errorKey: 'ai.wordCountMax', params: { max: 2000, current: wordCount } },
+        { errorKey: 'ai.wordCountMax', params: { max: 5000, current: wordCount } },
         { status: 400 }
       )
     }