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/locales/ko.json

@@ -1436,7 +1436,10 @@
       "notifyEmail": "이메일 알림",
       "notifyEmailHint": "각 실행 후 에이전트 결과가 포함된 이메일 받기",
       "includeImages": "Include images",
-      "includeImagesHint": "Extract images from scraped pages and attach them to the generated note"
+      "includeImagesHint": "Extract images from scraped pages and attach them to the generated note",
+      "back": "Back",
+      "configuration": "Configuration",
+      "options": "Options"
     },
     "frequencies": {
       "manual": "수동",
@@ -1629,4 +1632,4 @@
     "initializing": "작업 공간 초기화 중",
     "loadingIdeas": "아이디어 로딩 중..."
   }
-}
+}