Make the resume bilingual and part of the shared site chrome

Adds a Russian version (data/resume.ru.json, default language) with an RU/EN
switch stored under the key shared with the front page and the portfolio.
The top bar becomes the site-wide one (brand, Resume, Portfolio, Gitea,
Contact, language, theme) with a second row of anchors for this page's
sections, and the fonts move to Unbounded and Onest so the three pages share
one type system. Portfolio links now point at /portfolio/.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01XtcZtnG4GQA1d6mW5PNrS9

components/TitleSync.tsx

@@ -0,0 +1,23 @@
+'use client'
+
+import { useEffect } from 'react'
+
+/** Keeps the tab title in the visitor's language: Next re-applies its default title while hydrating. */
+export default function TitleSync() {
+  useEffect(() => {
+    const apply = () => {
+      const html = document.documentElement
+      const wanted = html.getAttribute(`data-title-${html.dataset.lang}`)
+      if (wanted && document.title !== wanted) document.title = wanted
+    }
+    apply()
+    const observer = new MutationObserver(apply)
+    observer.observe(document.head, { childList: true, subtree: true, characterData: true })
+    window.addEventListener('langchange', apply)
+    return () => {
+      observer.disconnect()
+      window.removeEventListener('langchange', apply)
+    }
+  }, [])
+  return null
+}