feat(editor): implement US-EDITOR-UX with global block selection, redesigned slash menu (favorites & preview), contextual placeholders, smart paste extended, turn into and undo/redo toasts

memento-note/locales/en.json

@@ -2320,9 +2320,28 @@
     "slashLoading": "AI thinking...",
     "slashTabAll": "All",
     "slashCatBasic": "Basic blocks",
+    "slashCatText": "Text",
     "slashCatMedia": "Media",
+    "slashCatData": "Data",
+    "slashCatEmbed": "Embed",
     "slashCatFormatting": "Formatting",
     "slashCatAi": "AI Note",
+    "placeholderH1": "Main heading...",
+    "placeholderH2": "Section heading...",
+    "placeholderH3": "Subsection heading...",
+    "placeholderTodo": "Add a task...",
+    "placeholderCode": "Write code...",
+    "placeholderQuote": "Capture a quote...",
+    "placeholderText": "Type '/' to insert a block...",
+    "smartPasteUrlTitle": "Link or Media Detected",
+    "smartPasteUrlHint": "What would you like to do with this link?",
+    "smartPasteUrlLink": "Paste as hyperlink",
+    "smartPasteUrlImage": "Insert as image",
+    "smartPasteUrlVideo": "Insert as video player",
+    "smartPastePlain": "Paste as plain text",
+    "smartPasteCodeTitle": "Source Code Detected",
+    "smartPasteCodeHint": "Source code was detected. Would you like to insert it as a code block?",
+    "smartPasteCodeBlock": "Insert as code block",
     "insertImage": "Insert image",
     "imageUrlPlaceholder": "https://example.com/image.png",
     "preview": "Preview",