refactor: implement smart navigation for "Get Mycelium Connector" button with smooth scroll utility

- Added smoothScrollToElement utility function in src/utils/scroll.ts with easeInOutQuad animation and configurable duration
- Changed Header and HeaderDark "Get Mycelium Connector" button from static /download link to onClick handler with conditional navigation
- Added handleGetConnectorClick function that scrolls to #download section when on /network page, otherwise navigates to /network
- Change

src/utils/scroll.ts

@@ -0,0 +1,28 @@
+export function smoothScrollToElement(id: string, duration = 800) {
+  const element = document.getElementById(id)
+  if (!element) return
+
+  const startY = window.scrollY || window.pageYOffset
+  const targetRect = element.getBoundingClientRect()
+  const targetY = startY + targetRect.top
+  const startTime = performance.now()
+
+  function easeInOutQuad(t: number) {
+    return t < 0.5 ? 2 * t * t : -1 + (4 - 2 * t) * t
+  }
+
+  function step(currentTime: number) {
+    const elapsed = currentTime - startTime
+    const progress = Math.min(elapsed / duration, 1)
+    const eased = easeInOutQuad(progress)
+    const nextY = startY + (targetY - startY) * eased
+
+    window.scrollTo(0, nextY)
+
+    if (progress < 1) {
+      requestAnimationFrame(step)
+    }
+  }
+
+  requestAnimationFrame(step)
+}