Update admin theme/layout and refresh README details.

Align the project baseline with the latest admin interface styling and layout structure while documenting setup and usage updates in README.

apps/web/Dockerfile

@@ -0,0 +1,31 @@
+# Monorepo dev image: build context must be the repository root (see docker-compose.yml).
+FROM node:22-alpine
+
+# pnpm 9+ via Corepack (bundled with Node 22)
+RUN corepack enable && corepack prepare pnpm@9.15.9 --activate
+
+WORKDIR /app
+
+# --- dependency layer: copy only manifests so `pnpm install` can be cached ---
+COPY package.json pnpm-lock.yaml pnpm-workspace.yaml ./
+COPY apps/web/package.json ./apps/web/
+COPY packages/shared-types/package.json ./packages/shared-types/
+COPY packages/eslint-config/package.json ./packages/eslint-config/
+
+# Workspace packages referenced by the lockfile (minimal source for install/link)
+COPY packages/shared-types ./packages/shared-types/
+COPY packages/eslint-config ./packages/eslint-config/
+
+RUN pnpm install --frozen-lockfile
+
+# App source baked into the image; at runtime bind-mount overrides for live-reload
+COPY apps/web ./apps/web/
+
+EXPOSE 5173
+
+# Chokidar polling helps file watching on Docker Desktop (Windows/macOS bind mounts)
+ENV CHOKIDAR_USEPOLLING=true
+ENV WATCHPACK_POLLING=true
+
+# `pnpm exec` runs vite directly in the web workspace (avoids `--` arg forwarding issues)
+CMD ["pnpm", "--filter", "web", "exec", "vite", "--host", "0.0.0.0"]