画面下部に必要なスペース関連の改善 (#9509)

* enhance: apply same safe area processing to the tab bar

* fix: remove unnecessary bottom space on messaging room

* enhance bottom spacing

* fix size of `minBottomSpacing`

packages/frontend/src/pages/messaging/messaging-room.vue

@@ -351,7 +351,6 @@ definePageMetadata(computed(() => !fetching ? user ? {
 		z-index: 2;
 		bottom: 0;
 		padding-top: 8px;
-		bottom: calc(env(safe-area-inset-bottom, 0px) + 8px);
 
 		> .new-message {
 			width: 100%;