feat: Implement game restart, battlefield styling with art crops and tapped stacks, and initial draw fixes.

docs/development/devlog/2025-12-18-203000_fix_restart_game.md

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+---
+title: Fix Restart Game Action
+status: Completed
+---
+
+## Objectives
+- Fix the "Restart Game" button not actually resetting the game state fully (players were left with empty hands).
+
+## Diagnosis
+- The `restartGame` method in `GameManager` correctly reset the global state (turn, phase, step) and moved cards back to the library.
+- However, it **failed to trigger the initial card draw** (Mulligan phase start).
+- This happened because `RulesEngine.startGame()` (which handles the initial draw loop) was never called after the reset.
+
+## Fix Implemented
+- Updated `GameManager.ts` to instantiate a new `RulesEngine` and call `.startGame()` at the end of `restartGame`.
+- This ensures that after resetting variables, the engine immediately shuffles libraries and deals 7 cards to each player, effectively restarting the match.
+
+## Verification
+- Clicking "Restart Game" now properly resets life totals, clears the board, and deals a fresh opening hand to all players.