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

packages/pdf/src/document.tsx

@@ -4,9 +4,9 @@ import type { Locale } from "@reactive-resume/utils/locale";
 import type { ComponentType } from "react";
 import type { SectionTitleResolver } from "./section-title";
 import { useMemo } from "react";
+import { Document } from "#react-pdf-renderer";
 import { RenderProvider } from "./context";
 import { registerFonts, resumeContentContainsCJK, resumeContentScripts } from "./hooks/use-register-fonts";
-import { Document } from "./renderer";
 import { getTemplatePage } from "./templates";
 
 export type TemplatePageProps = {
@@ -16,7 +16,7 @@ export type TemplatePageProps = {
 
 export type TemplatePage = ComponentType<TemplatePageProps>;
 
-export type ResumeDocumentProps = {
+type ResumeDocumentProps = {
 	data: ResumeData;
 	template: Template;
 	resolveSectionTitle?: SectionTitleResolver | undefined;