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/de.json

@@ -1436,7 +1436,10 @@
       "notifyEmail": "E-Mail-Benachrichtigung",
       "notifyEmailHint": "Erhalten Sie eine E-Mail mit den Ergebnissen des Agenten nach jedem Durchlauf",
       "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": "Manuell",
@@ -1629,4 +1632,4 @@
     "initializing": "Arbeitsbereich wird initialisiert",
     "loadingIdeas": "Deine Ideen werden geladen..."
   }
-}
+}