Add Esc shortcut to close card view

[nickmeinhold]

Summary

Add a keyboard shortcut (Escape) to close the card detail view and navigate back to the board.

Context

Cards are displayed as full route-based pages (/cards/[cardId]), not modals. Currently the only way to close is via the X button or browser back. The codebase has an existing keyboard shortcut system (apps/web/src/providers/keyboard-shortcuts.tsx) that can be used here.

Edge case: TipTap editor menus

The TipTap editor's slash-command menu and @mention dropdown both use Escape to close themselves. The implementation must ensure that pressing Escape while one of these menus is open closes the menu — not the card view. This can be handled via event propagation (TipTap menus stop propagation) or by checking editor state.

Acceptance Criteria

• Pressing Escape while on the card view navigates back to the board
• Pressing Escape while a TipTap slash-command or mention menu is open closes the menu, not the card
• Pressing Escape while editing a checklist item cancels the edit, not the card view
• Works alongside existing keyboard shortcut infrastructure

Files to modify

• apps/web/src/views/card/index.tsx — add Escape key handler to navigate back

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