feat: clean up browse shared layout logic + introduce queuing (#6030)

* feat: clean up edge case behaviour and add queued to install logic

* fix: remove version choice modal

* feat: queued flow

* feat: standardize headers in app on proj pages

* fix: clear btn

* feat: installing floating popup

* fix: lint

* fix: onboarding/reset logic change for modpacks

* qa: big ol qa

* fix: lint

* fix: lint

---------

Co-authored-by: Prospector <6166773+Prospector@users.noreply.github.com>

apps/frontend/src/server/routes/user/[username]/avatar.get.ts

@@ -0,0 +1,43 @@
+import { type Labrinth, ModrinthApiError } from '@modrinth/api-client'
+
+import { useServerModrinthClient } from '~/server/utils/api-client'
+
+export default defineEventHandler(async (event) => {
+	const username = getRouterParam(event, 'username')
+
+	if (!username) {
+		throw createError({
+			statusCode: 400,
+			message: 'Missing username',
+		})
+	}
+
+	const client = useServerModrinthClient({ event })
+
+	let user: Labrinth.Users.v2.User
+	try {
+		user = await client.labrinth.users_v2.get(username)
+	} catch (error) {
+		if (error instanceof ModrinthApiError && error.statusCode === 404) {
+			throw createError({
+				statusCode: 404,
+				message: 'User not found',
+			})
+		}
+
+		throw createError({
+			statusCode: 502,
+			message: 'Failed to resolve user avatar',
+		})
+	}
+
+	if (!user.avatar_url) {
+		throw createError({
+			statusCode: 404,
+			message: 'User avatar not found',
+		})
+	}
+
+	setHeader(event, 'cache-control', 'public, max-age=300, s-maxage=600')
+	return sendRedirect(event, user.avatar_url, 302)
+})