refactor: move setups list into collection page as third tab

Setups now lives alongside My Gear and Planning under /collection?tab=setups
instead of its own /setups route. Dashboard card updated to link to the new
tab. Setup detail pages (/setups/:id) remain unchanged.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/client/routes/__root.tsx

@@ -95,7 +95,8 @@ function RootLayout() {
 	const showFab =
 		isCollection &&
 		(!collectionSearch ||
-			(collectionSearch as Record<string, string>).tab !== "planning");
+			!(collectionSearch as Record<string, string>).tab ||
+			(collectionSearch as Record<string, string>).tab === "gear");
 
 	// Show a minimal loading state while checking onboarding status
 	if (onboardingLoading) {