Adds a gear button + modal on /, /master with a native color picker
and 8 preset swatches for the empty-cell background. The selected
color repaints both the player card AND the master tracking grid via
the --empty-cell-bg CSS variable. Default brown matches the physical
Minh Tân paper card.
settings-store.svelte.js: Svelte 5 rune-based reactive store, state
hydrated on layout mount, persisted to localStorage key loto_settings.
Validates hex (#rrggbb regex) before applying — keeps the CSS sink
safe and ignores corrupt or shorthand-3-digit payloads.
SettingsButton.svelte: gear icon, modal with picker + presets + reset
+ close, escape-to-close via window keydown listener (the trigger
button retains focus on open, so a dialog-scoped handler would miss).
eslint.config.mjs: declares Svelte 5 rune globals so .svelte.js stores
lint clean.
Docs synced: PDR, codebase-summary, system-architecture, roadmap.
`app/` should hold route segments only. Game logic and the player-card
component are imported by both routes, so they belong outside:
app/loto-game-logic.ts -> lib/game-logic.ts
app/loto-player-board.tsx -> components/player-board.tsx
Imports use the existing @/* alias. Drops the redundant `loto-` prefix.
Also fixes the package name from the scaffold default.
Adds the standard ./docs/ structure (overview, codebase summary,
architecture, code standards, design guidelines, deployment guide,
roadmap) and the code-review report under ./plans/reports/.
README now points at the docs and covers the codeserver dev profile.
tiennm99