fix(i18n): extract navigation links module and restore verbatim pt footer

- Move getLocalizedHref, LOCALES, and CANONICAL_ROUTES to i18n/links.js to resolve SSR 500 error on home
- Import from @/i18n/links in page.jsx, Header.jsx, Footer.jsx, and LanguageSelector.jsx
- Restore exact production footer texts, author links, and SVG icons in pt
- Verify 100% visible text parity on all pt pages against production with cmp-pt.py

Co-Authored-By: Antigravity <noreply@google.com>

i18n/links.js

@@ -0,0 +1,129 @@
+/**
+ * Utilitários de rotas e navegação internacionalizada.
+ * Módulo puro (sem 'use client') seguro para Server e Client Components.
+ */
+
+export const LOCALES = [
+	{ code: "pt", label: "Português", short: "PT", lang: "pt-BR" },
+	{ code: "en", label: "English", short: "EN", lang: "en" },
+	{ code: "es", label: "Español", short: "ES", lang: "es-419" },
+	{ code: "fr", label: "Français", short: "FR", lang: "fr" },
+	{ code: "de", label: "Deutsch", short: "DE", lang: "de" },
+	{ code: "zh-CN", label: "简体中文", short: "中", lang: "zh-CN" },
+];
+
+export const CANONICAL_ROUTES = [
+	{
+		id: "series_item",
+		match: /^\/(?:pt|en|es|fr|de|zh-CN)\/(?:series|serien)\/([^/]+)/,
+		getSlug: (loc, key) => (loc === "de" ? `/serien/${key}` : `/series/${key}`),
+	},
+	{
+		id: "frameworks_item",
+		match: /^\/(?:pt|en|es|fr|de|zh-CN)\/frameworks\/([^/]+)/,
+		getSlug: (loc, key) => `/frameworks/${key}`,
+	},
+	{
+		id: "series",
+		match: /^\/(?:pt|en|es|fr|de|zh-CN)\/(?:series|serien)(?:\/|$)/,
+		getSlug: (loc) => (loc === "de" ? "/serien" : "/series"),
+	},
+	{
+		id: "catalogo",
+		match: /^\/(?:pt|en|es|fr|de|zh-CN)\/(?:catalogo|catalog|catalogue|katalog)(?:\/|$)/,
+		getSlug: (loc) => {
+			if (loc === "de") return "/katalog";
+			if (loc === "fr") return "/catalogue";
+			if (loc === "en" || loc === "zh-CN") return "/catalog";
+			return "/catalogo";
+		},
+	},
+	{
+		id: "comparacao",
+		match: /^\/(?:pt|en|es|fr|de|zh-CN)\/(?:comparacao|compare|comparacion|comparaison|vergleich)(?:\/|$)/,
+		getSlug: (loc) => {
+			if (loc === "en" || loc === "zh-CN") return "/compare";
+			if (loc === "es") return "/comparacion";
+			if (loc === "fr") return "/comparaison";
+			if (loc === "de") return "/vergleich";
+			return "/comparacao";
+		},
+	},
+	{
+		id: "componentes",
+		match: /^\/(?:pt|en|es|fr|de|zh-CN)\/(?:componentes|components|composants|komponenten)(?:\/|$)/,
+		getSlug: (loc) => {
+			if (loc === "en" || loc === "zh-CN") return "/components";
+			if (loc === "fr") return "/composants";
+			if (loc === "de") return "/komponenten";
+			return "/componentes";
+		},
+	},
+	{
+		id: "diagnostico",
+		match: /^\/(?:pt|en|es|fr|de|zh-CN)\/(?:diagnostico|diagnostics|diagnostic|diagnose)(?:\/|$)/,
+		getSlug: (loc) => {
+			if (loc === "en" || loc === "zh-CN") return "/diagnostics";
+			if (loc === "fr") return "/diagnostic";
+			if (loc === "de") return "/diagnose";
+			return "/diagnostico";
+		},
+	},
+	{
+		id: "frameworks",
+		match: /^\/(?:pt|en|es|fr|de|zh-CN)\/frameworks(?:\/|$)/,
+		getSlug: () => "/frameworks",
+	},
+	{
+		id: "glossario",
+		match: /^\/(?:pt|en|es|fr|de|zh-CN)\/(?:glossario|glossary|glosario|glossaire|glossar)(?:\/|$)/,
+		getSlug: (loc) => {
+			if (loc === "en" || loc === "zh-CN") return "/glossary";
+			if (loc === "es") return "/glosario";
+			if (loc === "fr") return "/glossaire";
+			if (loc === "de") return "/glossar";
+			return "/glossario";
+		},
+	},
+	{
+		id: "seletor",
+		match: /^\/(?:pt|en|es|fr|de|zh-CN)\/(?:seletor|selector|selecteur|auswahl)(?:\/|$)/,
+		getSlug: (loc) => {
+			if (loc === "en" || loc === "es" || loc === "zh-CN") return "/selector";
+			if (loc === "fr") return "/selecteur";
+			if (loc === "de") return "/auswahl";
+			return "/seletor";
+		},
+	},
+	{
+		id: "sobre",
+		match: /^\/(?:pt|en|es|fr|de|zh-CN)\/(?:sobre|about|acerca|a-propos|ueber-uns)(?:\/|$)/,
+		getSlug: (loc) => {
+			if (loc === "en" || loc === "zh-CN") return "/about";
+			if (loc === "es") return "/acerca";
+			if (loc === "fr") return "/a-propos";
+			if (loc === "de") return "/ueber-uns";
+			return "/sobre";
+		},
+	},
+	{
+		id: "livro",
+		match: /^\/(?:pt|en|es|fr|de|zh-CN)\/livro(?:\/|$)/,
+		getSlug: (loc) => (loc === "pt" ? "/livro" : ""),
+	},
+];
+
+export function getLocalizedHref(pathname, targetLocale) {
+	if (!pathname || pathname === "/" || pathname === `/${targetLocale}` || pathname === `/${targetLocale}/`) {
+		return `/${targetLocale}/`;
+	}
+
+	for (const route of CANONICAL_ROUTES) {
+		const m = pathname.match(route.match);
+		if (m) {
+			const slug = route.getSlug(targetLocale, m[1]);
+			return slug ? `/${targetLocale}${slug}` : `/${targetLocale}/`;
+		}
+	}
+	return `/${targetLocale}/`;
+}