chore(notebooks): migrate demo scripts to Jupyter notebooks

[Borda]

This pull request removes the convert_to_ipynb.sh script from the notebooks directory. This script was previously used to convert Python files to Jupyter notebook format using Jupytext.

• Removed the convert_to_ipynb.sh script, which automated the conversion of .py files to .ipynb notebooks using Jupytext.

[review-notebook-app]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78%. Comparing base (87b1b86) to head (e2ac665).
⚠️ Report is 3 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff           @@
##           develop   #2240   +/-   ##
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  Coverage       78%     78%           
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  Files           66      66           
  Lines         8347    8347           
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  Hits          6475    6475           
  Misses        1872    1872           

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[Copilot]

Pull request overview

This PR cleans up legacy notebook tooling/content in the repository as part of the shift toward maintaining demos as committed Jupyter notebooks (not .py percent-format sources + conversion scripts).

Changes:

• Removed the legacy Jupytext conversion helper script (notebooks/convert_to_ipynb.sh).
• Removed the old percent-format notebook source for the 0.28.0 release demo (notebooks/release-demo_0-28.py).

Reviewed changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated no comments.

File	Description
notebooks/release-demo_0-28.py	Deletes the old percent-format demo source that previously lived under notebooks/.
notebooks/convert_to_ipynb.sh	Deletes the helper script that batch-converted notebooks/*.py to .ipynb.

Comments suppressed due to low confidence (2)

notebooks/release-demo_0-28.py:1

• Removing notebooks/release-demo_0-28.py (and the entire notebooks/ directory) makes the existing Colab link in docs/notebooks/compact-mask-sam3.ipynb point to a non-existent path (.../blob/develop/notebooks/release-demo_0-28.ipynb). Please update that notebook’s Colab URL to the new location (likely docs/notebooks/compact-mask-sam3.ipynb) or add an equivalent notebook at the old path to avoid a broken link.
  notebooks/convert_to_ipynb.sh:1
• PR description only mentions removing convert_to_ipynb.sh, but this PR also deletes notebooks/release-demo_0-28.py (and effectively removes the notebooks/ folder). Please update the PR description to reflect the full scope (e.g., migration/removal of the release demo source) so reviewers understand the impact.