fix: stabilize portfolio scrolling and loading

Remove skeleton swaps and deferred layout estimates, restore reveal state, and use native proximity scrolling for project cards. Also make the Docker build npm registry configurable.

Dockerfile

@@ -2,8 +2,12 @@ FROM node:22-alpine AS builder
 
 WORKDIR /app
 
+ARG NPM_REGISTRY=https://package-mirror.liara.ir/repository/npm/
+
 COPY package.json package-lock.json ./
-RUN npm ci
+RUN npm ci \
+  --registry="${NPM_REGISTRY}" \
+  --replace-registry-host=registry.npmjs.org
 
 COPY . .
 RUN npm run build