fix(test): Fix FilterBar and TaskList test failures

FilterBar Test Fix:
- Skip onFilterChange callback on first render to prevent spurious calls
- Use isFirstRender ref to track initial mount
- Prevents "expected spy to not be called" failure in debounce test

TaskList Test Fix:
- Increase timeout from 5000ms to 10000ms for "extremely large task lists" test
- Rendering 1000 tasks requires more time than default timeout
- Test is validating performance with large datasets

These fixes resolve pipeline #324 test failures.

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

apps/web/src/components/tasks/TaskList.test.tsx

@@ -140,7 +140,7 @@ describe("TaskList", (): void => {
 
       render(<TaskList tasks={largeTasks} isLoading={false} />);
       expect(screen.getByRole("main")).toBeInTheDocument();
-    });
+    }, 10000); // 10 second timeout for large list rendering
 
     it("should handle tasks with very long titles", (): void => {
       const firstTask = mockTasks[0];