feat: add Teams Explorer visual mapping and membership editor

src/App.jsx

@@ -10,6 +10,7 @@ import RepositoriesPage from './pages/RepositoriesPage'
 import ContributorsPage from './pages/ContributorsPage'
 import ContributorProfilePage from './pages/ContributorProfilePage'
 import NetworkPage     from './pages/NetworkPage'
+import TeamsPage       from './pages/TeamsPage'
 import AnalyticsPage   from './pages/AnalyticsPage'
 import GovernancePage  from './pages/GovernancePage'
 import SettingsPage    from './pages/SettingsPage'
@@ -36,6 +37,7 @@ function AppContent() {
         <Route path="/repositories" element={<RepositoriesPage />} />
         <Route path="/contributors" element={<ContributorsPage />} />
         <Route path="/contributors/:username" element={<ContributorProfilePage />} />
+        <Route path="/teams"        element={<TeamsPage />} />
         <Route path="/network"      element={<NetworkPage />} />
         <Route path="/analytics"    element={<AnalyticsPage />} />
         <Route path="/governance"   element={<GovernancePage />} />

src/components/Navbar.jsx

@@ -10,6 +10,7 @@ const LINKS = [
   { to: '/overview', label: 'Overview' },
   { to: '/repositories', label: 'Repositories' },
   { to: '/contributors', label: 'Contributors' },
+  { to: '/teams', label: 'Teams Explorer' },
   { to: '/network', label: 'Network' },
   { to: '/analytics', label: 'Analytics' },
   { to: '/governance', label: 'Governance' },