feat: replace browser login with imported Reddit sessions

tests/dashboard/performance-operations.test.tsx

@@ -127,6 +127,9 @@ describe('OperationsPage', () => {
     expect(await within(activityRegion).findByText('Reply from u/alex')).toBeInTheDocument();
     const jobsRegion = screen.getByRole('region', { name: 'Sync jobs' });
     expect(await within(jobsRegion).findByText('4 of 10')).toBeInTheDocument();
+    for (const name of ['Sync latest chats', 'Full cache sync', 'Fetch all chats']) {
+      expect(within(jobsRegion).getByRole('button', { name })).toHaveClass('button', 'secondary');
+    }
     expect(screen.getByRole('status', { name: 'Realtime connection' })).toHaveTextContent('State may be stale');
 
     const consoleRegion = screen.getByRole('region', { name: 'Live console' });