add new section to the side bar

[Mbeaulne]

Description

Enhanced the dashboard sidebar with additional navigation options and authentication integration. The sidebar now includes a documentation link, settings navigation, and conditional authentication controls. Restructured the sidebar layout to separate primary navigation from utility items with a visual divider.

Related Issue and Pull requests

Type of Change

• Bug fix
• New feature
• Improvement
• Cleanup/Refactor
• Breaking change
• Documentation update

Checklist

• I have tested this does not break current pipelines / runs functionality
• I have tested the changes on staging

Screenshots (if applicable)

Test Instructions

1. Navigate to the dashboard
2. Verify the sidebar displays all original navigation items (Dashboard, Experiments, Recently Viewed)
3. Check that the bottom section shows the documentation link, settings link, and authentication component (if authorization is required)
4. Test that the documentation link opens in a new tab
5. Verify the settings link navigates to /settings/backend
6. Confirm the authentication component appears only when authorization is required

Additional Comments

The sidebar now uses a flex layout to properly position utility items at the bottom, and includes proper external link handling for the documentation URL.

[github-actions]

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[Mbeaulne]

Warning

This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
Learn more

• Add components section #2025
• Add dashboard home view with favorites, recently viewed, and my runs sections #2011
• moves app footer #2010
• add new section to the side bar #2004 👈 (View in Graphite)
• Updates runs and pipelines designs #2003
• Adds runs and filters #2002
• update favourite and recent cards #2001
• Updates revently viewed #2000
• Adds recently viewed #1999
• Update design for favourites #1998
• add favourites to new dashboard #1997
• feat dashboard latout #1996
• Feat recently viewed #1986
• feat_favorites_filter #1985
• feat_favorites_homepage_section #1983
• feat_favorites_toggle_ui #1982
• feat favorites infrastructure #1980
• Dashboard and beta #1932
• Add Claude AI skills for project conventions and development standards #1931
• master

This stack of pull requests is managed by Graphite. Learn more about stacking.

[Mbeaulne]

Reviewer note: Adds Docs, Settings, auth button, and footer links to the sidebar bottom. DashboardLayout.tsx is still not in its final form — the full-height two-column layout and independent scroll areas are finalized in #2010. If reviewing the sidebar as a whole, #2010 is the cleaner place to do it.