feat(home): add Role Manager card + fix ecosystem toggle on /role-manager

[stevep0z]

What

Two related changes around Role Manager:

1. Adds a Role Manager card as the fourth card in the Open Source Tools section of the docs homepage.
2. Fixes the ecosystem toggle, which rendered blank on /role-manager.

1. Homepage card

Title	Role Manager
Link	/role-manager
Description	Manage contract permissions from one interface to define role-based access, set multi-level hierarchies, and assign granular admin controls for any team or governance model.

It fills the empty second slot in the two-column Minor Tools grid next to UI Builder.

On the link target: the card points at the docs page rather than rolemanager.openzeppelin.com, matching Relayer, Monitor and UI Builder, which all point at their docs. The Role Manager Quick Start links out to the app in its first section, so the app is one click away — and this keeps readers on the page whose toggle this PR repairs.

On the icon: the supplied SVG hardcoded a #0A0A0A stroke, which would have rendered near-invisible in dark mode. RoleManagerIcon uses currentColor and 1em sizing instead, following the convention of the other icons in src/components/icons/.

2. Ecosystem toggle fix

/role-manager is listed in both stellar.json and ethereum-evm.json, so getEcosystemFromPath() sees two owners, treats the page as ambiguous and returns null — by design.

The problem is that /role-manager was then missing from the shared-path lists that handle exactly this case for /monitor, /relayer, /ui-builder, /ecosystem-adapters and /tools, and from every tab's urls set. So on /role-manager:

• isTabActive() matched no tab;
• RootToggle's findLast() returned undefined;
• the toggle fell back to its empty placeholder and rendered blank.

This adds /role-manager to the shared-path checks in use-navigation-tree.ts and docs-layout-client.tsx, and to the Ethereum and Stellar urls sets — mirroring exactly how /ui-builder is already handled.

Verification

• biome check on all changed files — clean.
• tsc --noEmit — clean.
• Rendered /role-manager on a local dev server with and without the fix:

	Toggle renders
Before	(nothing — blank placeholder)
After	Ethereum & EVM

• Homepage renders the card with href="/role-manager".

Worth a reviewer's eye: the Stellar-context path (arrive at /role-manager from the Stellar docs → toggle should stay on Stellar) is driven by client-side sessionStorage and wasn't exercised by the SSR check above. The logic is identical to /ui-builder, but a manual click-through would confirm it.

🤖 Generated with Claude Code

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