Add encouragement message to drafts list

Shows "So many thoughts, you should post one" at the bottom of the drafts list when user has more than 5 drafts.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

src/view/com/composer/drafts/DraftsListDialog.tsx

@@ -140,13 +140,22 @@ export function DraftsListDialog({
 
   const footerComponent = useMemo(
     () => (
-      <ListFooter
-        isFetchingNextPage={isFetchingNextPage}
-        hasNextPage={hasNextPage}
-        style={[a.border_transparent]}
-      />
+      <>
+        {drafts.length > 5 && (
+          <View style={[a.align_center, a.py_2xl]}>
+            <ButtonText style={[t.atoms.text_contrast_medium]}>
+              <Trans>So many thoughts, you should post one</Trans>
+            </ButtonText>
+          </View>
+        )}
+        <ListFooter
+          isFetchingNextPage={isFetchingNextPage}
+          hasNextPage={hasNextPage}
+          style={[a.border_transparent]}
+        />
+      </>
     ),
-    [isFetchingNextPage, hasNextPage],
+    [isFetchingNextPage, hasNextPage, drafts.length, t],
   )
 
   return (