On user profiles, move pinned notes down with the other note tabs (resolves #555)

What does this PR do?

Moves the list of a user's pinned notes to a tab with the other note categories (Note, All, and With Files). This reduces the amount of scrolling that is needed when opening a profile with a large number of pinned notes. This resolves #555 (closed).

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packages/frontend/src/pages/user/home.vue

@@ -807,7 +807,7 @@ onUnmounted(() => {
 }
 
 .tab {
-	margin: calc(var(--margin) / 2) 0;
+	margin-bottom: calc(var(--margin) / 2);
 	padding: calc(var(--margin) / 2) 0;
 	background: color-mix(in srgb, var(--bg) 65%, transparent);
 	backdrop-filter: var(--blur, blur(15px));