Add rules enforcement to offline matches with toggle setting

[Copilot]

• Add rulesEnforced state to App component (default true, persisted in localStorage)
• Add toggleRules callback for toggling enforcement
• Modify move validation in src/index.tsx to enforce rules in offline mode when enabled
• Update bar piece enabled logic to respect rulesEnforced in offline mode
• Update board point enabled prop to respect rulesEnforced in offline mode
• Pass rulesEnforced + toggleRules through Dialogues component chain
• Add gavel icon toggle item to Login menu showing "Rules: On" / "Rules: Off"
• Add gavel icon toggle item to Friends menu showing "Rules: On" / "Rules: Off"
• Add rulesEnforced and rulesNotEnforced i18n translation strings (English)
• When rulesEnforced, tapping dice in offline mode now sets/alternates game.color (White→Black→…), so nextMoves() returns legal moves

Original prompt

Offline games previously had no rules enforcement — pieces could be placed anywhere freely. add rules enforcement to offline matches by default, with a settings menu option to disable/re-enable it both in the login menu and friends menu when you're focusing on the offline match

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[github-actions]

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[ProLoser]

@copilot when the rules are on, tapping the dice should set the player color

[Copilot]

@copilot when the rules are on, tapping the dice should set the player color

Done in commit 4e3efa3. In the local rollDice branch, when rulesEnforced is true, the color now alternates with each dice tap: null → White (first roll), White → Black, Black → White. This mirrors what the online branch already does, so nextMoves() has a valid color to work with and returns the correct legal moves.