fix(ai-toolbar): honor AI state in shortcuts and clipboard dedup

src/components/ai-toolbar.tsx

@@ -310,6 +310,8 @@ export const AIToolbar = ({
 									if (
 										e.key === "Enter" &&
 										(e.metaKey || e.ctrlKey) &&
+										!aiLoading &&
+										canUseAi &&
 										(aiPrompt.trim() || hasImages)
 									) {
 										e.preventDefault();

src/lib/multi-image.ts

@@ -8,14 +8,15 @@
 
 /**
  * Returns a stable deduplication key for a File.
- * Key = `name:size` — cheap, deterministic, and catches re-selections of the
- * exact same file (same name *and* same byte count).
+ * Key = `name:size:lastModified` — cheap, deterministic, and catches
+ * re-selections of the exact same file while keeping clipboard fallback files
+ * distinct when they share a generated name and byte size.
  *
- * Two different files that happen to share a name but have different content
- * will have different sizes and therefore different keys.
+ * Two different files that happen to share a generated fallback name but have
+ * different timestamps will not collapse to the same key.
  */
 export function imageFileKey(file: File): string {
-	return `${file.name}:${file.size}`;
+	return `${file.name}:${file.size}:${file.lastModified}`;
 }
 
 /**