Design required for swap export in mobile swaps/orders/history list views

[smk762]

Related: #3348 (comment)

In the above PR, a request was made to include uuid copy and swap data export buttons within the Swaps/Orders/History tables. As space is in limited supply, especially on mobile, we should formulate a robust design before implementing this.

[coderabbitai]

A summary of the changes CodeRabbit can apply:

• Add a new design document at docs/design/MOBILE_SWAP_ACTIONS_DESIGN.md (and update docs/design/README.md) that specifies adding icon-only 24×24 touch action buttons (Copy UUID and Export Data) via a reusable SwapActionButtons widget, to be integrated into History/Orders/In-Progress list card headers with WCAG-compliant sizing, snackBar feedback, localization keys, testing plans, and phased implementation steps.

• Add a new design doc docs/design/MOBILE_SWAP_ACTIONS_DESIGN.md describing and approving icon-only UUID copy and export actions (with implementation plan, files to change, tests, accessibility, and code examples) and create docs/design/README.md to list and guide design documents.

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