refactor: remove dead code, unused exports and redundant dependencies

- drop dotenv (Node 24 process.loadEnvFile) and dompurify (only used by dead code)
- delete unused ui components/hooks (card, progress, checkbox, use-confirm, use-prompt)
- delete dead sanitizeHtml/sanitizeCss, url-security helpers, patch-resume tool,
  schema/page, createResumePatches, patch-proposal preview builder, fonts fallback helpers
- inline single-caller wrappers (flags service, auth getSession, pdf renderer passthrough)
- deduplicate template color helpers into shared/color-helpers
- unexport 50+ internal-only symbols, remove dead export-map entries
- replace hand-rolled unique()/useIsMobile with Set spread and usehooks-ts

apps/web/src/routes/_home/-sections/features.tsx

@@ -20,7 +20,6 @@ import {
 	TranslateIcon,
 } from "@phosphor-icons/react";
 import { m } from "motion/react";
-import { useMemo } from "react";
 import { cn } from "@reactive-resume/utils/style";
 
 type Feature = {
@@ -167,7 +166,7 @@ function FeatureCard({ icon: Icon, title, description }: FeatureCardProps) {
 }
 
 export function Features() {
-	const features = useMemo(() => getFeatures(), []);
+	const features = getFeatures();
 
 	return (
 		<section id="features">