feat: connectivity view: move quota up and combine with IMAP state. (#7653)

like described in
https://github.com/chatmail/core/pull/7630#discussion_r2641514867


## classical account (with legacy option mvbox)

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|---|---|
| <img width="891" height="635" alt="image"
src="https://github.com/user-attachments/assets/723f3dba-79dc-4b57-a14f-c5879c1a1d1d"
/>| <img width="890" height="578" alt="image"
src="https://github.com/user-attachments/assets/d45eaf35-d7b2-40d4-8c37-bbc77947c27d"
/>|

## multi transport

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|---|---|
|<img width="891" height="1236" alt="image"
src="https://github.com/user-attachments/assets/053cb088-7d9d-4591-b2bc-6b49399d33a0"
/> |<img width="885" height="1230" alt="image"
src="https://github.com/user-attachments/assets/c455b4f1-f521-4ae8-8884-9042af62ca46"
/>|

src/scheduler.rs

@@ -324,8 +324,8 @@ impl Drop for IoPausedGuard {
 
 #[derive(Debug)]
 struct SchedBox {
-    /// Hostname of used chatmail/email relay
-    host: String,
+    /// Address at the used chatmail/email relay
+    addr: String,
     meaning: FolderMeaning,
     conn_state: ImapConnectionState,
 
@@ -831,14 +831,9 @@ impl Scheduler {
                 let ctx = ctx.clone();
                 task::spawn(inbox_loop(ctx, inbox_start_send, inbox_handlers))
             };
-            let host = configured_login_param
-                .addr
-                .split("@")
-                .last()
-                .context("address has no host")?
-                .to_owned();
+            let addr = configured_login_param.addr.clone();
             let inbox = SchedBox {
-                host: host.clone(),
+                addr: addr.clone(),
                 meaning: FolderMeaning::Inbox,
                 conn_state,
                 handle,
@@ -854,7 +849,7 @@ impl Scheduler {
                 let meaning = FolderMeaning::Mvbox;
                 let handle = task::spawn(simple_imap_loop(ctx, start_send, handlers, meaning));
                 oboxes.push(SchedBox {
-                    host,
+                    addr,
                     meaning,
                     conn_state,
                     handle,