fix: replace tqdm.notebook import with tqdm in helper scripts

[abhayjeet5465]

Summary

Replaces from tqdm.notebook import tqdm with from tqdm import tqdm
in 4 helper scripts.

Problem

tqdm.notebook is designed exclusively for Jupyter notebook cells — it
renders an IPython widget. When the same import is used inside a plain
.py helper script (which gets imported by notebooks, not run as a cell),
it either falls back silently or raises a rendering warning depending on
the environment. The correct import for helper scripts is the standard
from tqdm import tqdm, which works correctly in both notebook and
non-notebook contexts.

Files Changed

• notebooks/catvton/catvton_quantization_helper.py
• notebooks/ltx-video/ltx_video_quantization_helper.py
• notebooks/sam2-image-segmentation/automatic_mask_generation_helper.py
• notebooks/stable-diffusion-v3-torch-fx/sd3_quantization_helper.py

Verification

Get-ChildItem -Path notebooks/ -Recurse -Include "*.py" |
  Select-String -Pattern "from tqdm\.notebook import tqdm"

Output: empty (all fixed)