Use a custom context menu sheet on Android

[lucaboox]

useContextMenu carried a requestAnimationFrame workaround on Android to stop a second action sheet from silently failing to appear when two were opened back to back.

This replaces the action sheet on Android with a bottom sheet rendered by the app, which removes the need for that workaround and lets the menu show its title, message, disabled entries, destructive colouring, and an icon per row.

Notes

• ContextMenuSheet owns the pending request itself and is shown through an imperative showContextMenu() call, so nothing is threaded through ActionSheetBgContext — which iOS also consumes. Those files are untouched.
• Row icons are matched from the option label via a small regex table, falling back to a generic chevron. It's a heuristic and it will degrade to the fallback if labels are ever localized — happy to drop the icons entirely if you'd rather not carry that.

iOS

Unaffected. The sheet is mounted only on Android and the iOS branch of useContextMenu is unchanged.

Verification

tsc --noEmit and eslint are clean, and a release build was installed and exercised on a physical device (Android 17, arm64).

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