feat: design system, animations, bug fixes, and data cleanup

[NicoRuedaA]

Summary

Consolidated improvements across design system, asset references, data integrity, and bug fixes.

Changes

File	Change
src/App.css	Complete @theme tokens (danger, surface, navy scale, shadows), Oswald heading font, keyframe animations, noise/mesh backgrounds, gradient utilities
src/components/ui/Card.tsx	shadow-card + hover scale/shadow interaction
src/components/ui/Modal.tsx	New generic Modal component with backdrop-blur and scale-in
src/components/ui/Input.tsx	New Input with label, error, iconLeft
src/components/ui/Textarea.tsx	New Textarea with label and error
src/lib/playerPhotos.ts	Removed ERLS imports and lec-player-XXXX legacy pattern
src/components/finances/FinancesTab.tsx	Fixed player photos - direct profile_image_url
src/components/dashboard/DashboardHeader.tsx	Fixed player search photos
src/components/match/ChampionDraft.tsx	Fixed draft player photos
src/components/match/DraftResultScreen.tsx	Fixed result screen photos
src/components/dashboard/DashboardSidebar.tsx	Removed letter color transition on nav items
src/components/dashboard/DashboardTabContent.tsx	Added animate-fade-in-up on tab switch
src/components/dashboard/DashboardModalFrame.tsx	Now uses Modal component
src/pages/Dashboard.tsx	Added bg-navy-mesh and bg-navy-noise atmosphere
src-tauri/crates/ofm_core/src/transfers.rs	Bug fix: filter empty strings from active_lineup_ids after reconcile
src-tauri/crates/db/src/repositories/competition_repo.rs	Bug fix: persist League.logo in INSERT/SELECT
src-tauri/src/commands/game.rs	Bug fix: apply_default_initial_contract_end treats empty string as missing
data/players/*.json	Data fix: contract_end empty strings to null; fixed 7 players with birth years in contract_end
docs/player-fitness-condition.md	New documentation for Condition and Fitness systems
src/i18n/locales/en.json, es.json	Added common.fitness and match.condition translation keys

Bug Fixes

1. Competition logos lost on save/load - INSERT/SELECT never included logo column
2. Players with no contract at game start - empty string treated as Some("") instead of None
3. False "0 healthy players" after signing - reconcile_lol_active_lineup produced empty strings
4. Player photos missing in Finances tab - resolvePlayerPhoto called without profile_image_url
5. Competition card logos - added logo field to LeagueData

Test Plan

• cargo check passes with no new errors
• npx tsc --noEmit shows only pre-existing errors
• npm run build produces valid Vite output
• npm run tauri build produces .exe + installers

Checklist

• Conventional commit format used throughout
• No breaking changes to data format
• New components documented in src/components/ui/index.ts
• Player photos unified to single source of truth (profile_image_url)
• resolvePlayerPhoto legacy code simplified