Add cross-navigation footer

[jpr5]

Summary

• Adds a shared cross-navigation toolbar above the existing footer on aimock.copilotkit.dev
• Pill-shaped links to all 5 copilotkit.dev sub-properties (vscode, aimock, oversight, pathfinder, outpost) with colored dots
• Current page (aimock) highlighted with accent border/glow, non-clickable
• Responsive: pills wrap naturally, shrink below 640px, label hidden below 480px

Test plan

• Verify toolbar renders correctly at desktop width
• Verify pills wrap properly on mobile
• Verify active pill (aimock) is highlighted and non-clickable
• Verify other pills link to correct URLs
• Verify no visual regression to existing footer

[pkg-pr-new]

Open in StackBlitz

npm i https://pkg.pr.new/@copilotkit/aimock@141

commit: 9329a70