UI-U1/U2/U4/U5: dashboard showcases + server-side leaderboard sort
- U1: render the /api/traders/showcases sections on the dashboard as
clickable curated leaderboard cards (red_flags visually accented).
- U2: loadTraders() now sends the sort key to the API (real top-N),
take raised to 200; only name/platform stay client-sorted.
- U4: #tradersSort dropdown extended with calmar/conviction/profitfactor/
pnl30d; currentSort synced before building the query.
- U5: fix empty-state colspan 11 -> 10 (table has 10 columns).
Includes FIXPLAN-UI-Ranglisten.md documenting the plan.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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