Add Top Movers detail screen with full rankings list

[christabel888]

Context: The home-screen card (#42-#44) shows a few movers -- this is the full-list drill-down.

Where:

• New src/screens/main/TopMoversScreen.tsx

What to do:

• Build a screen listing the full ranking, reusing TopMoversCard/its data hook.

Suggested approach:

1. Reuse Build TopMoversCard component #42/Wire TopMoversCard to /api/v1/rankings/top-movers #43's component and data hook for the full-list view rather than building parallel data-fetching for the detail screen.

Watch out for:

• None beyond standard screen hygiene.

Definition of done:

• Screen shows the full ranked list, reachable by tapping into the home-screen card