feat(web): add "upgrade account" CTA above sidebar profile for free users

Shows a brand-tinted "Hesabını Yükselt" badge above the username in the
sidebar footer, linking to the subscription page. Hidden for users with
an active paid plan. Renders in desktop (expanded + collapsed icon
variant), and the mobile drawer.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

apps/web/src/routes/dashboard.tsx

@@ -46,6 +46,7 @@ import {
   Settings,
   Share2,
   Shield,
+  Sparkles,
   Sun,
   Users,
 } from "lucide-react";
@@ -245,6 +246,46 @@ function DashboardLayout() {
     .sort((a, b) => b.to.length - a.to.length)[0];
   const pageTitle = currentItem ? t(currentItem.labelKey) : t("nav.dashboard");
 
+  // Upgrade CTA shown above the profile — only for users without a paid plan.
+  function UpgradeBadge({
+    collapsed: isCollapsed,
+    onClick,
+  }: {
+    collapsed: boolean;
+    onClick?: () => void;
+  }) {
+    if (hasActivePlan) return null;
+
+    if (isCollapsed) {
+      return (
+        <Tooltip>
+          <TooltipTrigger asChild>
+            <Link
+              to="/dashboard/subscription"
+              onClick={onClick}
+              aria-label={t("nav.upgradeAccount")}
+              className="mb-1 flex items-center justify-center rounded-lg border border-brand/30 bg-brand/10 p-2.5 text-brand transition-colors hover:bg-brand/15"
+            >
+              <Sparkles className="size-4" />
+            </Link>
+          </TooltipTrigger>
+          <TooltipContent side="right">{t("nav.upgradeAccount")}</TooltipContent>
+        </Tooltip>
+      );
+    }
+
+    return (
+      <Link
+        to="/dashboard/subscription"
+        onClick={onClick}
+        className="mb-2 flex items-center gap-2 rounded-lg border border-brand/30 bg-brand/10 px-3 py-2 text-xs font-semibold text-brand transition-colors hover:bg-brand/15"
+      >
+        <Sparkles className="size-4 shrink-0" />
+        <span>{t("nav.upgradeAccount")}</span>
+      </Link>
+    );
+  }
+
   // Profile menu — replaces the old "click-to-logout" trap with a real menu.
   function ProfileMenu({
     collapsed: isCollapsed,
@@ -406,6 +447,7 @@ function DashboardLayout() {
 
           {/* User Profile - Bottom */}
           <div className={`border-t border-border ${collapsed ? "p-2" : "p-3"}`}>
+            <UpgradeBadge collapsed={collapsed} />
             <ProfileMenu collapsed={collapsed} />
           </div>
         </aside>
@@ -505,6 +547,7 @@ function DashboardLayout() {
               <SidebarNav onNavigate={() => setMobileOpen(false)} />
             </nav>
             <div className="border-t border-border p-3">
+              <UpgradeBadge collapsed={false} onClick={() => setMobileOpen(false)} />
               <ProfileMenu collapsed={false} onItemSelect={() => setMobileOpen(false)} />
             </div>
           </SheetContent>