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/en.json

@@ -544,7 +544,10 @@
       "preview": "Preview",
       "generatePreview": "Generate preview",
       "emptyNoteHint": "💡 The note is empty — the resource content will be integrated directly."
-    }
+    },
+    "cancel": "Cancel",
+    "copied": "Copied",
+    "copy": "Copy"
   },
   "titleSuggestions": {
     "available": "Title suggestions",
@@ -1587,7 +1590,10 @@
       "notifyEmail": "Email notification",
       "notifyEmailHint": "Receive an email with the agent's results after each run",
       "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": "Manual",
@@ -1683,7 +1689,10 @@
       "title": "History",
       "noHistory": "No executions yet",
       "toolTrace": "{count} tool calls",
-      "step": "Step {num}"
+      "step": "Step {num}",
+      "clearConfirm": "Are you sure you want to delete all history for this agent?",
+      "cleared": "History deleted",
+      "clearHistory": "Clear history"
     },
     "tools": {
       "title": "Agent Tools",
@@ -1875,4 +1884,4 @@
     "addBlock": "Add block",
     "placeholder": "Type '/' for commands..."
   }
-}
+}