Fix deleteFile undefined $toast and reversed delete/fetch order

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

tests/stores/files.test.js

@@ -159,13 +159,31 @@ describe('filesStore', () => {
   });
 
   describe('deleteFile', () => {
-    it('deletes a log file via axios.delete', async () => {
-      axios.get.mockResolvedValue({ data: [] });
-      axios.delete.mockResolvedValue({});
+    it('calls axios.delete before fetchAllFiles', async () => {
+      const callOrder = [];
+      axios.delete.mockImplementation(async () => {
+        callOrder.push('delete');
+        return {};
+      });
+      axios.get.mockImplementation(async () => {
+        callOrder.push('get');
+        return { data: [] };
+      });
 
       await store.deleteFile('log', 1);
 
       expect(axios.delete).toHaveBeenCalledWith('/api/logs/1');
+      expect(callOrder.indexOf('delete')).toBeLessThan(
+        callOrder.indexOf('get'),
+      );
+    });
+
+    it('returns early for invalid id without throwing', async () => {
+      await expect(
+        store.deleteFile('log', null),
+      ).resolves.toBeUndefined();
+
+      expect(axios.delete).not.toHaveBeenCalled();
     });
   });