feat(navigation): add route defined tabs

[harry-whorlow]

Summary by CodeRabbit

• New Features
  • Added configurable custom tool tabs to library documentation, including catalog navigation.
  • Added route-aware documentation tab selection for pages with custom tab settings.
  • Added full-width layouts for Examples, npm statistics, and catalog pages.
• Improvements
  • Improved active-state handling and menu expansion for custom tool destinations.
  • Custom tool links now navigate directly without unnecessary route preloading.

[coderabbitai]

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Advanced

Run ID: df88976c-32f7-49ff-bd94-634c7b8f0821

📥 Commits

Reviewing files that changed from the base of the PR and between 2a43601 and 4a522ab.

📒 Files selected for processing (1)

• src/utils/docsNavTabs.ts

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📝 Walkthrough

Walkthrough

The change adds custom tool tab definitions and route metadata. Library navigation and layout logic now use library-aware custom targets and route-provided tab settings. Charts-specific menu handling is removed, and related navigation tests use the updated signatures.

Changes

Custom library tool tabs

Layer / File(s)	Summary
Tab contracts and route metadata src/libraries/custom-tool-tabs.ts, src/router.tsx, src/utils/docsNavTabs.ts, src/routes/_library/...	Custom tool tab types, target matching, route docsTab metadata, and tab override handling are added.
Custom target navigation src/components/library-layout-navigation.ts, tests/charts-sidebar-navigation.test.ts	Navigation helpers use typed LibraryId values and classify targets with isCustomToolTarget. Tests pass the updated arguments.
Library layout integration src/components/LibraryLayout.tsx	Charts-specific menu entries are removed. Custom tabs, route tab metadata, custom link behavior, and docsTab.fullBleed now control layout navigation.

Priority: ⬇️ Low

Estimated code review effort: 3 (Moderate) | ~25 minutes

Change: Feature

Sequence Diagram(s)

sequenceDiagram
  participant RouteStaticData
  participant LibraryLayout
  participant customToolTabs
  participant NavigationLink
  RouteStaticData->>LibraryLayout: Provide docsTab metadata
  LibraryLayout->>customToolTabs: Check library and target
  customToolTabs-->>LibraryLayout: Return custom target status
  LibraryLayout->>NavigationLink: Configure origin and preload behavior

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Suggested reviewers: tombeckenham

Merge Risk: ⚪ Minimal · up to 4a522

Custom tabs, active-tab selection, and full-bleed route settings are aligned, with no established merge-blocking behavior.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 10.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 10 functions across 9 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly summarizes the main change: adding route-defined navigation tabs and related custom tool tab support.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

• Fix all pre-merge checks with AI

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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