Add automatic per-email address unread folders

server/src/lib.rs

@@ -793,7 +793,17 @@ impl FromStr for Query {
             if word == "is:unread" {
                 unread_only = true
             } else if word.starts_with("tag:") {
-                tags.push(word["tag:".len()..].to_string());
+                let t = &word["tag:".len()..];
+                // Per-address emails are faked as `tag:@<domain>/<username>`, rewrite to `to:` form
+                if t.starts_with('@') && t.contains('.') {
+                    let t = match t.split_once('/') {
+                        None => format!("to:{t}"),
+                        Some((domain, user)) => format!("to:{user}{domain}"),
+                    };
+                    remainder.push(t);
+                } else {
+                    tags.push(t.to_string());
+                };
 
                 /*
                             } else if word.starts_with("tag:") {