Add shortcut badges to top sidebar navigation links

[jbecke]

Motivation

• Make the top navigation rows (Inbox, Search, Agents, etc.) visually consistent with the bottom action buttons by surfacing their keyboard shortcuts inline.
• Help users discover navigation hotkeys by showing the same styled shortcut chips used elsewhere in the sidebar.

Description

• Added a shortcut badge to each SidebarLink render in js/app/packages/app/component/app-sidebar/sidebar.tsx that displays either g + key for go-to scoped links or a single key for standalone shortcuts.
• The new chips reuse the existing Hotkey component and match the visual style used in the bottom action section.
• Chips respect existing slim-sidebar behavior via the group-data-[slim=true]/sidebar:invisible class so they hide when the sidebar is collapsed.
• Kept existing click/navigation behavior and hotkey registration intact; this change only augments the UI for each link.

Testing

• Ran bun run check which failed in this environment due to missing local type definition packages (errors for @types/facebook-pixel, vite/client, etc.).
• Ran lint for the modified file via the repo lint script which failed here due to registry access issues when resolving biome (npm 403 during fetch).
• Attempted a Playwright snapshot against http://localhost:3000/app/component/unified-list but the local dev server was not available (ERR_EMPTY_RESPONSE), so no UI screenshot could be captured.

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Codex Task

[github-actions]

Preview: https://codex-add-shortcut-labels-to-t-kinvn6.preview.macro.com/app (5322afe)