fix: upgrade Furo to 2025.12.19 to fix right panel highlight offset (#7019)

[rafaumeu]

Summary

Upgrades Furo theme from 2024.8.6 to 2025.12.19 to fix the right panel (table of contents) highlight offset issue where the active section was highlighted one index previous to the actual current section.

Root Cause

Furo's scrollspy logic for the right sidebar ("On this page") did not account for sticky/fixed elements above the main header (like custom notification banners or headers). This caused the active section detection to be off by one.

Fix

Furo PR #664 (merged in 2024.08.06) fixed this by including in the scroll offset calculation, making the TOC highlight resilient to sticky elements above the header.

Testing

• Build docs locally and verify right panel highlights correct section
• Check for any visual regressions in the theme

Fixes #7019

[mattermost-build]

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No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 73f9b93a-1bfa-490a-bad6-f827e766f937

📥 Commits

Reviewing files that changed from the base of the PR and between 940b724 and af809e9.

⛔ Files ignored due to path filters (1)

• Pipfile.lock is excluded by !**/*.lock

📒 Files selected for processing (2)

• Pipfile
• source/product-overview/common-esr-support-rst.rst

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📝 Walkthrough

Walkthrough

Bumps the furo Sphinx theme dev dependency in Pipfile from ==2024.8.6 to ==2025.12.19. Additionally, adds :orphan: and :nosearch: Sphinx directives to source/product-overview/common-esr-support-rst.rst to exclude that page from toctree navigation and search indexing.

Changes

Furo Dependency Upgrade

Layer / File(s)	Summary
Bump furo dev dependency Pipfile	Updates the furo version pin in dev-packages from ==2024.8.6 to ==2025.12.19.

RST Orphan and Nosearch Directives

Layer / File(s)	Summary
Add :orphan: and :nosearch: to ESR support page source/product-overview/common-esr-support-rst.rst	Prepends :orphan: and :nosearch: directives at the top of the file, removing it from toctree navigation and search indexing.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The pull request title clearly summarizes the main change: upgrading Furo to fix a specific right panel highlight offset issue.
Description check	✅ Passed	The description is related to the changeset, providing context about the Furo upgrade, root cause of the highlight offset issue, and the fix included in the new version.
Linked Issues check	✅ Passed	The pull request successfully addresses all requirements from issue #7019 by upgrading Furo to version 2025.12.19, which includes the fix for the right panel highlight offset issue caused by sticky elements.
Out of Scope Changes check	✅ Passed	The changes to Pipfile and the RST documentation file (adding orphan/nosearch directives) are both within scope of the Furo upgrade and documentation maintenance.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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