[049] Add gesture and keyboard shortcut support

[konard]

Parent epic: #1

Phase: Platform Wrappers
Priority: 49

Scope

Add platform-appropriate gestures and keyboard shortcuts for high-frequency messenger, agent, and wallet workflows.

Implementation Steps

• Define a shared action map for shortcuts and gestures.
• Implement platform adapters for desktop shortcuts and mobile gestures.
• Add collision checks and accessibility documentation.

Acceptance Criteria

• Common workflows have documented shortcuts or gestures where appropriate.
• Shortcut conflicts are detected or documented per platform.
• Users can disable risky shortcuts for transaction or agent actions.

Automation

Generated from #1 using scripts/decompose-epic.mjs.