fix: corrigir comportamento de paste no editor DAX

Adicionado um plugin ViewPlugin que intercepta eventos de paste e insere o texto do clipboard no editor CodeMirror. O handler de paste estava faltando, causando que o paste não funcionasse corretamente.

O plugin:
- Detecta quando o usuário tenta colar texto
- Extrai o texto do clipboard
- Insere no local da seleção atual
- Previne o comportamento padrão para evitar duplicação

https://claude.ai/code/session_011VUBgH8QA48BDse37N9SDd

Author: claude

src/components/DaxEditor.tsx

@@ -8,7 +8,7 @@ import {
   TooltipTrigger,
 } from '@/components/ui/tooltip';
 import { Compartment, EditorState, StateEffect, StateField, RangeSetBuilder } from '@codemirror/state';
-import { EditorView, keymap, lineNumbers, highlightActiveLine, Decoration, type DecorationSet } from '@codemirror/view';
+import { EditorView, keymap, lineNumbers, highlightActiveLine, Decoration, type DecorationSet, ViewPlugin } from '@codemirror/view';
 import { defaultKeymap, history, historyKeymap, indentWithTab, undo, redo } from '@codemirror/commands';
 import { syntaxHighlighting, HighlightStyle, bracketMatching } from '@codemirror/language';
 import { search, highlightSelectionMatches } from '@codemirror/search';
@@ -94,6 +94,30 @@ const errorBaseTheme = EditorView.baseTheme({
   },
 });
 
+const pastePlugin = ViewPlugin.define((view) => {
+  const handlePaste = (event: ClipboardEvent) => {
+    const text = event.clipboardData?.getData('text/plain');
+    if (text) {
+      const { state } = view;
+      const { from, to } = state.selection.main;
+      view.dispatch({
+        changes: { from, to, insert: text },
+        selection: { anchor: from + text.length },
+      });
+      event.preventDefault();
+    }
+  };
+
+  const dom = view.dom;
+  dom.addEventListener('paste', handlePaste, { passive: false });
+
+  return {
+    destroy() {
+      dom.removeEventListener('paste', handlePaste);
+    },
+  };
+});
+
 
 const EDITOR_COLORS: Record<DaxEditorTheme, Record<'light' | 'dark', EditorColors>> = {
   default: {
@@ -353,6 +377,7 @@ export const DaxEditor = forwardRef<DaxEditorHandle, DaxEditorProps>(function Da
         colorPickerExtension(swatchCallbackRef),
         errorField,
         errorBaseTheme,
+        pastePlugin,
         highlightCompartmentRef.current.of(syntaxHighlighting(buildHighlight(daxEditorTheme, theme))),
         themeCompartmentRef.current.of(buildTheme(daxEditorTheme, theme)),
         fontCompartmentRef.current.of(buildFontSizeTheme(fontSize)),