Verify the new economics "Stake moves" tile actually renders on mobile — the PR's own after-screenshot shows blank space where it should be

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Context

For #3753, the mobile (716px) "after" screenshot is 180px taller than "before" (1686px vs 1506px — matching one tile's height, implying the new "Stake moves" tile was added to the layout). But the visible content in the screenshot still ends at the prior "Registration" tile, followed by blank space matching the page background, in both light and dark mode. The tile that should be the last card in the grid isn't rendered in the shot at all — only empty space where it should be. This is either a genuine mobile-only render gap for the new tile, or a broken screenshot capture nobody caught before merging — either way, the PR's own evidence doesn't actually confirm the new tile works on mobile.

Requirement

Confirm the "Stake moves" economics tile actually renders visible content on mobile, not blank space.

Deliverable

• File to check: apps/ui/src/components/metagraphed/economics-panel.tsx, the "Stake moves" tile (introduced in feat(ui): surface subnet stake-moves (re-delegation) in the economics panel #3753).
• What "done" looks like concretely: capture a fresh mobile screenshot of the economics panel with the "Stake moves" tile scrolled into view, confirming its content (value, label, spark/legend) is actually visible. If it turns out to genuinely be blank/broken on mobile, fix the render condition or CSS causing it; if it was purely a stale/bad screenshot and the tile renders fine, this issue closes with the corrected screenshot as evidence.

Acceptance criteria

• A fresh mobile screenshot (both themes) shows the "Stake moves" tile with visible, non-blank content
• If a real rendering bug is found, it's fixed and economics-panel.tsx appears in the diff
• Desktop/tablet rendering (already confirmed working, per this PR's own desktop/tablet screenshots) is unaffected

Non-goals

• Don't change the tile's grid position or the panel's overall layout — see the separate, already-filed issue about the sparse-row/grid-gap this same tile introduces on desktop/tablet.

Size

Size: XS — keep this PR small (aim for ≤10 files / ≤1000 LOC).

Part of #2542.

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JSO-2883