fix: lock stored selection during modal - prevents mouseup from resetting on Replace click

entrypoints/content.ts

@@ -16,9 +16,13 @@ export default defineContentScript({
     let storedElement: HTMLTextAreaElement | HTMLInputElement | null = null;
     let storedRange: Range | null = null;
 
+    // Lock flag — prevents mouseup from resetting stored selection while modal is open
+    let selectionLocked = false;
+
     // ─── Selection capture (called immediately on mouseup) ────────────────────
 
     function captureSelectionNow(): boolean {
+      if (selectionLocked) return true; // selection is locked — don't reset
       const el = document.activeElement;
 
       // 1) textarea / input — grab positions while they're still valid
@@ -247,6 +251,7 @@ export default defineContentScript({
     async function runAction(action: string) {
       if (!selectedText) return;
       const textToProcess = selectedText;
+      selectionLocked = true; // lock stored selection — modal interaction won't reset it
 
       // Guard: extension may have been reloaded/updated
       if (!isExtensionValid()) {
@@ -404,6 +409,7 @@ export default defineContentScript({
         replaceBtn.addEventListener('mousedown', (e) => e.preventDefault()); // keep stored selection intact
         replaceBtn.addEventListener('click', () => {
           replaceText(resultText);
+          selectionLocked = false; // unlock after replace
           overlay.remove();
           modal!.remove();
           modal = null;
@@ -443,6 +449,7 @@ export default defineContentScript({
         cursor:      'pointer',
       });
       dismissBtn.addEventListener('click', () => {
+        selectionLocked = false; // unlock on dismiss
         overlay.remove();
         modal!.remove();
         modal = null;