build: Add Docker containerization documentation and remove unused variables to resolve TypeScript errors.

docs/development/devlog/2025-12-14-235700_docker_containerization.md

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+# Docker Containerization and Build Fixes
+
+## Objectives
+- Create a Dockerfile to package the application as a monolith (Node.js + React).
+- Fix TypeScript build errors preventing successful compilation.
+- Verify the build process.
+
+## Changes
+- **Dockerfile**: Created multi-stage build using `node:20-alpine`.
+    - Installs dependencies.
+    - Builds frontend.
+    - Prunes dev dependencies.
+- **Server Entry (`src/server/index.ts`)**: Added logic to serve static `dist` files and handle client-side routing in production.
+- **Package.json**: Moved `tsx` to dependencies and updated `start` script.
+- **Code Fixes**: Removed unused variables in client and server code used to satisfy strict TypeScript rules:
+    - `DeckBuilderView.tsx`: Removed unused `payload`.
+    - `DraftView.tsx`: Removed unused `CardComponent`.
+    - `GameView.tsx`: Removed unused `myCommand`, `oppGraveyard`.
+    - `DraftManager.ts`: Removed unused `numPlayers`, `cardIndex`.
+    - `GameManager.ts`: Renamed unused args in `shuffleLibrary`.
+
+## Status
+- Docker build successful (`docker build -t mtg-draft-maker .`).
+- Image ready for deployment.