style: adopt renamed Tailwind v4 utilities

- Rename bg-gradient-to-r to bg-linear-to-r (v4 renamed
  linear gradients), resolving the linter suggestion.
- Rename bare `rounded` to `rounded-sm` so the docs nav
  keeps its v3 radius (v4 shifted the radius scale, so bare
  `rounded` no longer maps to 0.25rem).

Author: nixrajput

web/app/page.tsx

@@ -85,7 +85,7 @@ export default function Home() {
             >
               Sync any database,
               <br />
-              <span className="bg-gradient-to-r from-(--flow) to-(--flow-2) bg-clip-text text-transparent">
+              <span className="bg-linear-to-r from-(--flow) to-(--flow-2) bg-clip-text text-transparent">
                 anywhere.
               </span>
             </h1>

web/components/DeveloperSection.tsx

@@ -31,7 +31,7 @@ export function DeveloperSection() {
             Made by{" "}
             <ExtLink
               href={DEVELOPER.portfolio}
-              className="bg-gradient-to-r from-(--flow) to-(--flow-2) bg-clip-text text-transparent hover:no-underline"
+              className="bg-linear-to-r from-(--flow) to-(--flow-2) bg-clip-text text-transparent hover:no-underline"
             >
               {DEVELOPER.name}
             </ExtLink>

web/components/DocsNavLink.tsx

@@ -23,7 +23,7 @@ export function DocsNavLink({
     <Link
       href={href}
       aria-current={active ? "page" : undefined}
-      className={`block rounded px-2 py-1 text-sm no-underline transition-colors hover:bg-(--ink-2) hover:text-(--paper) hover:no-underline ${
+      className={`block rounded-sm px-2 py-1 text-sm no-underline transition-colors hover:bg-(--ink-2) hover:text-(--paper) hover:no-underline ${
         active
           ? "border-l-2 border-(--flow) bg-(--ink-2) pl-2.5 font-medium text-(--paper)"
           : "text-(--muted)"