## Why

Three bugs prevent proper gameplay: table settings from the setup page are ignored by the game, the bot decision timer resets incorrectly causing wrong countdowns, and opponent hand cards never reveal during showdown or all-in situations per poker rules.

## What Changes

- **Settings persistence**: Read `sessionStorage` config in the main game page and apply it to initialize game state instead of hardcoding the `trainingMix` preset
- **Bot timer fix**: Break the reactivity loop in `DecisionTimer.svelte` so the countdown decrements correctly without being reset by `$effect` re-runs
- **Card reveal rules**: Implement proper poker card visibility — show opponent hands at showdown, and when all-in players can no longer bet

## Capabilities

### New Capabilities
- `game-config-persistence`: Loading table configuration from setup page into the game session
- `card-reveal-rules`: Showing opponent hole cards according to poker showdown and all-in rules

### Modified Capabilities
- `decision-timer`: Fixing countdown reset behavior so timer decrements correctly per second

## Impact

- `src/routes/+page.svelte` — read sessionStorage config, apply to game state
- `src/lib/components/DecisionTimer.svelte` — fix reactivity loop
- `src/lib/components/PlayerSeat.svelte` — add card reveal logic
- `src/lib/components/PokerTable.svelte` — pass reveal context to PlayerSeat