[frontend] Handle unhandled errors

[lim396]

• errorを投げたがuncaught errorになっていた箇所を修正しました。
• getUserでnullが返ってきた時にNotFoundページを表示するように修正しました。(404以外もnotFoundに行ってしまうので微妙)
• getRoomでerrorが投げられた時にerrorページが表示されていたのをNotFoundページを表示するように修正しました。(userと同じく404以外もnotFoundに行ってしまうので微妙かも)
• 各ユーザーページでユーザーがアクション(add frined、blockなど)を行った時のエラー通知をtoastでするように修正しました。

[coderabbitai]

Walkthrough

The recent updates focus on improving error handling within various user interaction components of the application. Changes include the addition of showErrorToast functions to display error messages when specific actions fail. These enhancements aim to provide users with better feedback in case of errors during friend requests, blocking, unblocking, and friend management operations.

Changes

File(s)	Change Summary
frontend/app/ui/user/accept-friend-request-button.tsx, frontend/app/ui/user/add-friend-button.tsx, frontend/app/ui/user/cancel-friend-request-button.tsx, frontend/app/ui/user/reject-friend-request-button.tsx, frontend/app/ui/user/remove-friend-button.tsx, frontend/app/ui/user/block-button.tsx, frontend/app/ui/user/unblock-button.tsx	Added showErrorToast function to handle error messages for various user actions. Components now conditionally render error toasts based on response codes. Utilized useFormState hook for block user action.

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