feat(ui): add a World Backups icon to the title and pause screens

[ishaanko]

Reaching backups from the title screen or the pause screen took a detour through the world list or the Edit World screen. There was no quick way in from where you actually are.

A World Backups icon now sits at the far right of the square icon row (language, accessibility, friends) on both screens. On the title screen it opens the list of backed-up worlds. In a world it opens that world's backup browser. The row is laid out again around its old center so the extra icon never pushes off screen, and any square icon another mod adds stays part of the row.

The icon button and sprite come from the pause-screen work on dev; this PR ports only those pieces, generalizes the hook to both screens, and leaves the unrelated cancel/rollback changes behind.

Made with Claude Fable 5.1 in Claude Code.

🤖 Generated with Claude Code

[greptile-apps]

Confidence Score: 4/5

Do not merge until the live-world backup browser preserves the invoking pause screen.

Findings

1.  Pause menu parent replaced ▶

Summary

• The new title and pause shortcuts provide direct access to World Backups. When opened from a paused single-player world, closing the live-world backup browser rebuilds the pause menu instead of returning to the specific menu the player opened it from.