fix: use execCommand insertText for contenteditable replace - fixes delete-without-paste bug

entrypoints/content.ts

@@ -496,19 +496,35 @@ export default defineContentScript({
             // contenteditable / DOM range path
             console.log('[LexAI Replace] using DOM range');
             try {
-              snapRange.deleteContents();
+              // Strategy: restore the selection from the cloned range, then use
-              const textNode = document.createTextNode(resultText);
+              // execCommand('insertText') which works reliably on contenteditable.
-              snapRange.insertNode(textNode);
+              // insertNode() on stale ranges often fails after async operations.
               const sel = window.getSelection();
               if (sel) {
                 sel.removeAllRanges();
-                const newRange = document.createRange();
+                sel.addRange(snapRange); // restore original selection
-                newRange.setStartAfter(textNode);
+              }
-                newRange.collapse(true);
+
-                sel.addRange(newRange);
+              // Try execCommand first (works on most contenteditable editors)
+              const inserted = document.execCommand('insertText', false, resultText);
+
+              if (!inserted) {
+                // Fallback: direct DOM manipulation
+                snapRange.deleteContents();
+                const textNode = document.createTextNode(resultText);
+                snapRange.insertNode(textNode);
+                if (sel) {
+                  sel.removeAllRanges();
+                  const newRange = document.createRange();
+                  newRange.setStartAfter(textNode);
+                  newRange.collapse(true);
+                  sel.addRange(newRange);
+                }
               }
             } catch (err) {
               console.warn('[LexAI Replace] range replace failed:', err);
+              // Last resort: execCommand
+              try { document.execCommand('insertText', false, resultText); } catch (_) {}
             }
           } else {
             console.warn('[LexAI Replace] NO VALID SNAP STATE — snapStart:', snapStart, 'snapEnd:', snapEnd, 'snapElement:', snapElement, 'snapRange:', snapRange);